Screen backlight lamp

Laptop LCD screen and backlight lamp

A backlight lamp (also know as backlight bulb, screen backlight, CCFL tube or bulb) is the main and only source of light in a laptop LCD screen. A typical laptop LCD screen has only one backlight lamp installed. The backlight lamp mounts inside the laptop screen in the lower part of the screen as it outlined on the picture above.

A pair of cables with one connector coming from the screen plugs into the screen inverter board.

The backlight lamp receives high voltage AC power from the screen inverter board which receives low voltage DC power from the motherboard via the LCD screen cable as it shown on the picture below.

Backlight lamp connected to LCD screen

On the next picture you see a typical backlight lamp removed from a typical laptop LCD screen. There are two cables soldered to both sides of the backlight lamp attached to one connector.

Backlight lamp removed

BACKLIGHT LAMP REPLACEMENT

It is possible to replace a failed backlight lamp with a new one but it’s not easy because the backlight lamp is buried deep inside the LCD screen and it’s very easy to damage the screen during the disassembly process. This repair should be performed only by an experienced technician. You can find some home made backlight replacement instructions if you do Google search. For inexperienced people it would be much easier to replace the whole LCD screen.

BACKLIGHT LAMP FAILURE SYMPTOMS

1. The laptop screen lights up only for a short period of time or will not light up at all. The image on the screen is so dim that you can barely see it. At the same time, an external monitor attached to the laptop works fine.

2. When you turn on the laptop, the screen works fine for a while, then start flickering and the light turns off. Again, there is a very faint image on the laptop screen and external video output works fine.

3. The screen works but the image has a reddish/pink tone. External video output works fine.

The backlight lamp failure symptoms are very similar to the inverter board failure symptoms. If you have to guess which one is causing the problem, try replacing the inverter board first.

Posted in Laptop parts
73 comments on “Screen backlight lamp
  1. Tim says:

    I accidentally dropped my Dell XPS laptop from a 2 foot table. I was lucky because it landed on the carpet and now the screen didn’t crack but it will not light up. The laptop turns on and starts but the screen is so dark that it really hard to see anything. Do you think I broke the screen lamp?

  2. Repair Man says:

    Tim,

    I accidentally dropped my Dell XPS laptop from a 2 foot table. I was lucky because it landed on the carpet and now the screen didn’t crack but it will not light up. The laptop turns on and starts but the screen is so dark that it really hard to see anything.

    1. Could be loose connection between the cable and inverter board. Try reconnecting the cable first.
    2. It’s possible you damaged the backlight lamp and the LCD screen has to be replaced now.

  3. James says:

    Is this lamp expensive? Where I can find a backlight lamp for a laptop?

  4. Repair Man says:

    James,
    The backlight lamp is not expensive, you can find it on ebay for $10-15 but it’s very hard to replace the lamp. You’ll have to take apart the LCD screen.

  5. adeel says:

    hi i have a acer aspire 5920 my back light flikers on and off sometimes its on completly and others its off. other times only one corner of the screen is lit. what do u think is worng.(backlight lamp and/or inventer. pleas help me.

  6. Laptop Tech says:

    adeel,
    It’s hard to tell what is wrong in your case. The inverter and backlight fail the same way and have the same failure symptoms.
    You said that in times only one corner of the screen is lit. I think you have a faulty backligth lamp. When inverter fails, it usually fails completely and there is no light on the screen at all.
    You can buy an inexpensive backlight lamp and test your laptop to make sure it’s the backlight failure.

  7. Michael says:

    I had a problem with backlgith in my Dell Latitude D610 notebook. The screen was bright only for about 1-2 minutes on startup and after that it was turning very dark. If I reboot the notebook it was doing the same.
    I wasn’t sure if I had a bad inverter or backligth and instead of replacing them one by one I replaced the entire display which included the screen, inverter, cable, plastic covers, etc…
    I found a good used display on eBay for less than $70 and it was cheaper than the new screen!
    The replacement took me about 30 minutes and it was easy. Works great!

  8. Repair Man says:

    Michael,

    I wasn’t sure if I had a bad inverter or backligth and instead of replacing them one by one I replaced the entire display which included the screen, inverter, cable, plastic covers, etc…

    Isnt’ it strange? I notices that too. Sometimes it’s cheaper to replace the whold display assembly than just the LCD screen.

  9. Dorji says:

    Hi,

    I have an HP pavilion DV6000 notebook bought in February, 2007.

    I have noticed that the screen brightness is not what it used to be when it was new. It’s a little dimmer when compared to new notebooks these days.

    They say LCD screens lose their brightness overtime and mine’s been more than 2 years of heavy usage.

    If that’s the case, what can I do to bring up the brightness to the level it was when it was new. Do I have to change the inverter or the backlight lamp.

    Thank you in advance.

  10. Repair Man says:

    Dorji,

    I have noticed that the screen brightness is not what it used to be when it was new. It’s a little dimmer when compared to new notebooks these days.

    Have you tried to increase the screen brightness using Fn+F8 key combination? Press and hold down the Fn key and at the same time tap on the F8 key. Could be just a problem with the settings.

    They say LCD screens lose their brightness overtime and mine’s been more than 2 years of heavy usage.

    I don’t think that 2 years is a long time for the backlight lamp. My laptop is over 4 years old and I use it every day. The screen is still bright as before.

    If that’s the case, what can I do to bring up the brightness to the level it was when it was new. Do I have to change the inverter or the backlight lamp.

    Replacing the inverter board will not help. That’s for sure.

  11. chris says:

    Hi I just bought a second hand laptop and I’m having the same problem. The screen is not “as bright as it should be”. The laptop is approx 2-3 years old. Fn+F8 is all the way up.
    I’ve been wondering whether that’s something with the inverter or the lamp.
    You say that bad inverter means fickering or bklight completely off. But I wonder whether the inverter may have suffered some kind of ageing and is not supplying enough juice to lamps. Like the wrong voltage/frequency/duty cycle,… dunno. Is that possible? I guess it is either the inverter or the lamp. But my laptop has two lamps and the screen is backlit evenly so I doubt they’d both could fail in the same way.. What do you think?

  12. Repair Man says:

    chris,

    I just bought a second hand laptop and I’m having the same problem. The screen is not “as bright as it should be”. The laptop is approx 2-3 years old. Fn+F8 is all the way up.

    What laptop did you buy? Did you check settings in the BIOS? Maybe you can change the LCD screen brightness in the BIOS?
    What if you try decreasing the brightness, does it work?

  13. chris says:

    That’s 17″ vaio AR with wuxga+ double lamp – no brightness settings in BIOS. Decreasing/increasing works ok – but the screen on the highest settings is pretty dark, like it should be on the lowest setting. I’ve also noticed that the place where the inverter is (presumably – I haven’t opened the screen yet) – under lcd, in between speakers, close to the vaio logo gets pretty hot. I mean I can touch the bezel and keep my hand there, but I feel it is hot. Right now its 82F indoors so maybe that’s why it gets so hot. I don’t know… The vaio logo is also dimmer compared to what I’ve seen on another unit (another AR, different series though). I don’t know if the logo LEDs are on the same PCB as inverter. If this is the case – that may indicate that the inverter has some voltage deficiencies? I have a multimeter and a scope and I can measure voltages/frequencies on the inverter, but don’t know what values to expect, etc.

  14. Chris says:

    Ok. I’ve put it apart. LED logo is a separate circuit so it is unrelated to backlight. Both lamps seem to work. I unconnected one after another from the inverter board and the result was the lamp ignited then after a brief moment turned off completely. Each lamp did the same. So I guess both are working but the inverter refuses to run with a single lamp only. I am on my way to order a new ccfl tubes and replace the backlight, but I am usnure about certain things.
    – Since my laptop is working I haven’t attempted to pull out the ccfl tube and to measure it. The screen diameter (across all visible pixels rather than glass) is 432 mm (that is 17″, not 17.1″). The lcd panel active area is 367 mm wide. Now, there are two tubes, which are recommended for this screen: one is 370 and the other is 375 mm. Which one should I get – I guess that 370 should be better, but I’ve seen somewhere the 375 mm to be recommended for my screen.
    – Another thing is should I also consider other tube parameters (like ignition voltage / running voltage – or are they just linked to tube length and diameter) and more important – the colour temperature. The screen now (although somewhat dim) is pleasantly warm, reds and skin tones are rendered very naturally. I am a little bit afraid that when I get two new and bright 9000K tubes I loose that fine colour rendition capability. I do not do heavy photo-editing and stuff, but I shoot a lot of pictures and would like to look them good on my screen.

    What do you think?

  15. Alex says:

    Hello, I’m trying to fix my old Inspiron 600m that fell from 3 feet and the LCD display is not working since. I found out that it works with external display so I pretty much narrowed the problem to broken inverter or backlight lamp. However, I also found out that while the screen looks entirely blank, when you look at very sharp angle (and using a flashlight), I can actually see the laptop screen. Does this give me any additional information — i.e. whether the problem is inverter or backlight lamp? Thanks a lot!

  16. Jeremy says:

    Hey Chris,
    Thanks to the power of Google I found your posts about your Vaio-AR series. I think I am having the exact same symptoms… it is very dim compared to how it used to/should be… I am getting a brightness reading of 120 cd/m2… according to specs it should be in the neighborhood of 300 cd/m2. I am very interested to see if you find any solution to the problem.
    I have a Vaio VGN-AR390E with the 1920×1200 WUXGA and the low-brightness is driving me crazy! I hope you or the repairman has some insight.
    Thanks!

  17. Repair Man says:

    Alex,

    I’m trying to fix my old Inspiron 600m that fell from 3 feet and the LCD display is not working since. I found out that it works with external display so I pretty much narrowed the problem to broken inverter or backlight lamp. However, I also found out that while the screen looks entirely blank, when you look at very sharp angle (and using a flashlight), I can actually see the laptop screen.

    Most likely it’s either bad backlight lamp or poor connection between the video cable and inverter/motherboard/LCD screen.
    1. Try reconnecting the video cable. Make sure all ends are plugged in correctly.
    2. Try replacing the LCD screen.

    I don’t think that you can damage the inverter board by dropping the laptop. Most likely you’ve damaged the backlight lamp.
    You can buy the entire display assembly (LCD and inverter) on eBay for about $50-60.

  18. Repair Man says:

    Chris, Jeremy,
    Have you guys tried upgrading the BIOS to the latest version?

  19. Bryan says:

    Hey guys,

    Awesome site you have here.

    I currently own a Fujitsu Lifebook N6110. I had several strips running vertically on my screen so I bought a new compatible lcd screen. However when I took apart the laptop to replace the screen, I noticed that the original broken LCD had two backlight connectors, whereas the replacement only had one.

    Can I just replace the original inverter with a new one that accepts only one connector? If so, what kind of inverter would be compatible? If not, what are my options (as I cant really return the LCD anymore)?

  20. Repair Man says:

    Bryan,

    I had several strips running vertically on my screen so I bought a new compatible lcd screen. However when I took apart the laptop to replace the screen, I noticed that the original broken LCD had two backlight connectors, whereas the replacement only had one.

    Apparently you bought a wrong screen. Your old screen has two backlight lamps (not very common for laptops). I would suggest buying an exact copy of the old screen.

    Can I just replace the original inverter with a new one that accepts only one connector? If so, what kind of inverter would be compatible?

    I’m not sure about that. I’ve seen very few laptop screens with two backlight lamps.
    You can try using your new screen with the old inverter but I don’t know if it will work at all. It either will not be as bright as before (because you are using only one backlight) or the backlight will not start at all (because the inverter has to be loaded by two lamps).

  21. Bryan says:

    hey repair man,

    thanks for the super quick reply!

    i already tried plugging the new monitor into the original inverter, but it didnt work. the screen shows up for the loading screen then quickly becomes very faint, which must mean it isnt getting enough power. that would make sense, i assume, since only half the power is being supplied.

    the original screen had two backlight connectors which connected to a two-pronged inverter. since i bought the wrong screen, which only has one connector, would it work if i just bought a new one-pronged inverter?

    in other words, does the laptop recognize that the lcd is a two lamp screen? or is the inverter the only reason why the two screens have differing numbers of converters?

  22. Janet says:

    I just replaced the backlight bulb in my Compaq v2000. It now gets very hot down where the bulb is and shuts off after a few hours. What could be causing this and how would I fix it? Thanks!!!

  23. Guido says:

    Dear Repair man,

    Im trying to find out what the differences between LCD laptop panels and LCD monitor panels are.. Could you help me on this one?

    Cheers,

    Guido

  24. Repair Man says:

    Guido,

    Im trying to find out what the differences between LCD laptop panels and LCD monitor panels are.. Could you help me on this one?

    Sorry, I do not understand your question. Maybe I’m missing something?

  25. binu says:

    hello repair man

    my toshiba laptop wont display anything on POST. Display will show up after vista logo. everythings fine after vista logo. During POST CCFL lights up for a second and will go off. It will light up again from vista logo. Because of this i cant access the bios screen. I just replaced the lcd screen and inverter but still problem persist. Is it because of the lcd video cable?

    if i uninstall the video driver ccfl wont light up at all. Then i had to plug my external display to install driver then it will start from vista logo.

  26. Repair Man says:

    binu,

    my toshiba laptop wont display anything on POST. Display will show up after vista logo. everythings fine after vista logo. During POST CCFL lights up for a second and will go off. It will light up again from vista logo. Because of this i cant access the bios screen. I just replaced the lcd screen and inverter but still problem persist. Is it because of the lcd video cable?

    Sounds like a software related problem. I think your laptop screen starts working only after Vista logo because the laptop “thinks” the laptop screen is the secondary screen, not the primary.
    1. Can you access BIOS screen on the external monitor? Enter the BIOS setup menu and load default settings. Also, find out if you can set the laptop screen as the primary one in the BIOS menu.
    2. Boot your laptop to the desktop and go to the display settings. In the display settings you’ll see two monitors. Number 1 and number 2. Click on the number 2. Below you’ll see “This is my main monitor” box. If it checked, uncheck the box, safe settings and reboot the laptop.
    3. Start your laptop with an external monitor. Hold down the Fn key and press on the F5 key until video appears only on the laptop screen. Try rebooting the laptop now.

    I just replaced the lcd screen and inverter but still problem persist. Is it because of the lcd video cable?

    You didn’t have to replace anything. I think your problem is software related.

  27. Ernest says:

    Hi,
    If the backlight and inverter tested ok, please what might be the cause of dim on my laptop screen. If the motherboard how would i solve it. Thank you.

  28. Repair Man says:

    Ernest,

    If the backlight and inverter tested ok, please what might be the cause of dim on my laptop screen.

    1. A stuck lid close switch. Make sure the lid close switch moves freely.
    2. Bad video cable. It’s not likely but possible.

    If the motherboard how would i solve it.

    In cases like that I replace the motherboard. I don’t work on the component level and cannot fix a failed motherboard.

  29. paul says:

    hi,

    only the lower right portion of my laptop screen lights up and after a second or two the screen start to dim until you can’t barely see the image on the screen and when you close the screen and open it up again same thing happens. which could be the problem, the inverter or the backlight. please help..

  30. Jennifer says:

    My HP dv6000’s screen just stopped working. I have it hooked up to an external monitor and it works fine. The laptop screen just remains off when i turn it on (without the external display). I don’t know what’s wrong with it. I was sitting on the couch with it on my lap and someone bumped into it and it fell on the carpet. And after that it was working fine. Then i turned it off as usual and when i turned it bk on, the screen never came back.
    DO you think it’s a backlight lamp issue? If so, is it a good idea to have it replaced? I talked to HP and they had no idea what was wrong and told me to replace the whole display…which would cost me $350 and it seemed stupid to do that.
    Let me know what you think please!
    Thanks!

  31. Repair Man says:

    paul,

    only the lower right portion of my laptop screen lights up and after a second or two the screen start to dim until you can’t barely see the image on the screen and when you close the screen and open it up again same thing happens. which could be the problem, the inverter or the backlight.

    I think this is the backlight lamp failure. Apparently the lamp is failing and has to be replaced. It’s hard to replace the lamp, so think about replacing the entire LCD screen.
    Just in case, you can try reseating connectors on the inverter board. It’s possible that one of the connectors is loose and the inverter or backlight lamp is not getting enough power from the motherboard. Just a guess.

  32. Repair Man says:

    Jennifer,

    My HP dv6000’s screen just stopped working. I have it hooked up to an external monitor and it works fine. The laptop screen just remains off when i turn it on (without the external display). I don’t know what’s wrong with it. I was sitting on the couch with it on my lap and someone bumped into it and it fell on the carpet. And after that it was working fine. Then i turned it off as usual and when i turned it bk on, the screen never came back.

    It’s possible that one of the cables inside the display panel got disconnected when the laptop was dropped.
    Before replacing anything, I would try:
    1. Reseating the video cable connector on the motherboard. This connector is located under the keyboard bezel, close to the left hinge.

    2. Try reseating connector on both sides of the inverter board. One of them could be loose.
    3. Finally, try reseating the video cable connection on the back of the LCD screen.

  33. Maryan says:

    my hp pavillion dv2000 has a cracked lCD. most of the screen has a black and white stains, with line all over. However, a little part if the screen about 10% of it is intact and i can view the actual computer screen on it what do you advise i do?

  34. Repair Man says:

    Maryan,

    my hp pavillion dv2000 has a cracked lCD. most of the screen has a black and white stains, with line all over. However, a little part if the screen about 10% of it is intact and i can view the actual computer screen on it what do you advise i do?

    If the screen is cracked, you cannot fix it. The whole screen has to be replaced.

  35. benny says:

    Hi there ,I have a dv2000 , i ready change a new screen inverter,bu screen do not light up, can someone tell me why , I been reading about this here apparently could be the back light,can you please tell me , whats going up

  36. zeth says:

    HOw much does it normally cost to have the Backlight replaced alone in my laptop?

  37. Repair Man says:

    zeth,

    HOw much does it normally cost to have the Backlight replaced alone in my laptop?

    It depends on the laptop model and repair shop. You have to research.

  38. eharmon says:

    hp pavilion dv9000 – turn on and backlight flashes and goes out. I can switch to external screen and see everything fine. When I try to switch back to computer screen it “pops” and flashes for a moment and then is black.

    On the laptop display only faint shadowy image. I replaced both the backlight and inverter – same scenario. There is a periodic (once a minute or so) grinding/buzzing emanating from the laptop near the dc power jack. Any ideas? Thanks!

    PS – when I tested the backlight after the replacement of the same and the inverter it worked until I put everything back together.

  39. Mamta says:

    Hi
    i have lenovo y410 laptop .my laptop is working fine since last 1.5 YEAR but last morning when power on the laptop . Laptop lcd back light on but not show any image on the lcd and i hear the window opening sound but still i cant saw any image . Laptop fan is spain proper i also check it is not inverter problem plz help me.

  40. Repair Man says:

    Mamta,

    last morning when power on the laptop . Laptop lcd back light on but not show any image on the lcd and i hear the window opening sound but still i cant saw any image .

    Can you test your laptop with an external monitor? Can you get video on the external monitor?

  41. Timon says:

    I have a sony VAIO laptop which lately showed signs of a screen problem. During a cold boot everything works fine, but when i start to reboot it, the screen shows only a white blank screen. I can hear Windows starting normally but you see nothing on the screen (only white). This symptom has been on for a while that even a cold start would show also a white screen. I tried connecting an external monitor and everything worked fine. I have replaced the lcd screen with a new one but the problem still persist from time to time. Could this problem be related to a bad inverter or backlight? Are there other components that would affect this problem like power supply, battery transfer switches etc? Appreciate the help, thanks.

  42. sheik fazal says:

    i have problem from dell vostro 1310 there is a screen problem its showing white screen. and not showing windows? i had connect external monitor its working. plz help me

  43. Ryan says:

    Hello, I have a Compaq Presario V2000 laptop. My LCD screen started getting a red tint all over the screen so I replaced the LCD cable in it. Though, after that, the whole screen became dim so I couldn’t see it even when it was still showing.

    So, I looked around and bought a replacement inverter for my laptop but got the same result. Then I bought a brand new LCD monitor and surprisingly didn’t work either. I tested the new LCD on my dad’s HP Pavilion DV1000 and the backlight turned on from pressing the lid close switch. I also tested my LCD cable and the inverter and it shows that it works on the other laptop as well.

    Could it be my lid close switch that is causing the problem? I can still press it to make it go to standby but the backlight doesn’t flash on. Thanks in advance!

  44. Alex says:

    Hello,
    I have a problem and I can’t figure out what the problem is. It started with a dim display. I tried another inverter but it didn’t solve it. I could use the laptop with an external monitor but now that doesn’t work anymore. The ext. monitor won’t start up(tried it with several ones) so I’m afraid my video card might be broken as well now. Windows works, I can hear the login sounds. Could you please give me an advice? Any clue on what the problem(s) is/are?

  45. Repair Man says:

    Alex,

    I have a problem and I can’t figure out what the problem is. It started with a dim display. I tried another inverter but it didn’t solve it. I could use the laptop with an external monitor but now that doesn’t work anymore. The ext. monitor won’t start up(tried it with several ones) so I’m afraid my video card might be broken as well now. Windows works, I can hear the login sounds. Could you please give me an advice? Any clue on what the problem(s) is/are?

    It sounds like you have two different problems in one laptop.
    Do you still have a dim image on the laptop screen? Did you try reconnecting the video cable connector on the back of the screen?

  46. Evan Gary says:

    Replaced backlight alone by soldering it to the wire harness. No results until i moved the light around (before reinserting it to the screen, in order to test it). Then i my finger touched one exposed end of the backlight where it was soldered, and i received a shock and it went out.
    I replaced the wire harness with a new one, but still no results. I replaced the inverter as well, but still no response. Could the bulb have blown?

  47. Repair Man says:

    Evan Gary,

    Then i my finger touched one exposed end of the backlight where it was soldered, and i received a shock and it went out.
    I replaced the wire harness with a new one, but still no results. I replaced the inverter as well, but still no response. Could the bulb have blown?

    I cannot tell. Yes, it’s possible that you killed the backlight lamp, but maybe you shocked the motherboard too.
    The only way to find out is testing the laptop with another backlight lamp.

    By the way, you still can see image on the external monitor, correct?

  48. Mike Walsh says:

    I have an IBM R51, The screen flickers occasionaly and goes black occasionally. When I hit the Fn F7 button (sometimes a few times) it comes back up and works fine(external monitor/none attached). I have updated all the drivers, run multiple virus scans, now I’m thinking hardware issue. Looking at the posts above, I’m thinking it could get complicated/expensive. Any advice you can offer would be greatly appreciated. It’s runing XP pro, service pack 3, machine type 1836.

    Thanks

    Mike

  49. Repair Man says:

    Mike Walsh,

    I have an IBM R51, The screen flickers occasionaly and goes black occasionally. When I hit the Fn F7 button (sometimes a few times) it comes back up and works fine(external monitor/none attached). I have updated all the drivers, run multiple virus scans, now I’m thinking hardware issue.

    Take a very close look at the laptop screen when it goes black. Do you see a very faint image on the screen? You might use a flashlight.
    If the image is still there, most likely this is either the screen inverter or backlight lamp failure.
    You cannot tell which one is causing the problem without testing the laptop with another known good inverter OR backlight lamp.

    If you have no spare parts and have to guess, try replacing the inverter board first.
    If the problem is still there, probably this is backlight lamp failure. In this case you’ll have to replace the LCD screen.

  50. Sanjeev says:

    Hello Sir,

    I have Hp Pavilion Laptop ,model no. is dv2000.
    I am getting one problem while start the system
    then only sound is coming but display not showing
    display showing as multi lining display after
    few hours 4-5 i will check then display showing
    properly so please give best idea to resolve my
    problem.

    Thanks!

  51. prabhat says:

    Hi
    i have lenovo y410 laptop . when i start my . Laptop lcd back light on but not show any image on the lcd and i hear the window opening sound but still i cant saw any image . Laptop fan is spain proper i also check it is not inverter problem plz help me.

  52. Repair Man says:

    prabhat,

    i have lenovo y410 laptop . when i start my . Laptop lcd back light on but not show any image on the lcd and i hear the window opening sound but still i cant saw any image . Laptop fan is spain proper i also check it is not inverter problem plz help me.

    It’s hard to tell what is failing. Could be:
    1. Bad connection between the LCD cable and motherboard. Try reconnecting the cable.
    2. Bad LCD cable. Try replacing the cable.
    3. Bad LCD screen.
    4. Not likely, but possible – bad video connector on the motherboard.

    It’s hard to troubleshoot this problem without spare parts.

  53. Lord Hades says:

    Greetings,

    Lately I have been facing problems with my pavilion dv9700. The LCD brightness keeps flickering. Since it is a dual lamp display, the left side seems to be dimmer than the right, when both should b equal.

    What do you suggest I do? I have logged in to Linux, and the problem persists so I am pretty sure there is a hardware problem. Possibly the inverter or lamp? Please advise.

    LH

  54. mani says:

    Hi I have H.P Dv 2000 laptop with me, ther is a problem witch i am not able to view my scren proprely, but ther is display and it is working with external monitor, give me solution………

  55. Repair Man says:

    mani,

    I have H.P Dv 2000 laptop with me, ther is a problem witch i am not able to view my scren proprely, but ther is display and it is working with external monitor, give me solution………

    Can you see any image on the laptop screen? Looks very closely. Maybe the image is there but it’s very dark?
    If that’s the case, try replacing the inverter board.

  56. panchito says:

    hello i replace the screen hp pavilinoDV4-1548DX 14.1
    but i can only see part of the window, the right side its dark,
    appears the screen resolution its bad, but in the bios setup, looks the same

  57. Repair Man says:

    panchito,

    hello i replace the screen hp pavilinoDV4-1548DX 14.1
    but i can only see part of the window, the right side its dark,
    appears the screen resolution its bad, but in the bios setup, looks the same

    What do you mean the BIOS setup looks the same? Does the BIOS screen normal, full screen?
    What if you boot the laptop in safe mode? Is it working properly in safe mode?
    If you can see full screen in safe mode but no in normal mode, try reinstalling the display driver.

  58. Fred says:

    I have a Dell Inspiron 1545 at times on start up my screen goes very dim. You can hardly see image. I have replaced inverter board and problem remains. Laptop works fine on external monitor. Have restart computer several time before the screen stays on. Do you think the backlight is bad and need replacing. Plz advise

  59. RD of houston tx says:

    Hi! I recently ordered a replacement laptop backlight for my toshiba a25-s3072 laptop. I ordered the backlight assembly with wires. I tried to fit it back in the lcd screen assembly where the backlight assembly is suppose to go. I feels like it is tight and bulges. I secured it with screws so I can test the backlight and plug it in with the inverter to fire up the laptop. When I turn on the laptop, all I can see is the reflection of the lighted backlight on screen and only is illuminating 1/4 of the screen and is booting up but it is faint. How do I make it illuminate the screen brightly because it only has a faint glow of the backlight on the lcd?

    Hope you can help. thanks.

  60. franz says:

    I just noticed that the screen brightness of my laptop (hp hdx 16t)has decreased. its not dim as you would see when using the battery but you’ll notice that the white
    background of websites (e.g. yahoo, youtube, google) are a bit off-white (dirt white).
    i compared my laptop’s display with a Sony vaio laptop (vaio cs23) and i noticed that vaio’s display are brighter even under default settings. i always use my laptop under AC power and with no battery attached. i already updated my bios a long time ago.

    I already tried the following:

    1. fn + f8,
    2. adjusting the brightness under Control panel/personalization/windows color
    and appearance
    3. uninstalling then reinstalling Nvidia display driver
    4. when i adjust the brightness under Nvidia control panel, the screen appears foggy white and its a strain to the eye.

    could it be a sign of an aging backlight or inverter problem? it annoys me to see that white colors has now become off-white.

    franz

  61. Wes says:

    Will the inverter in a dv2000 work in a dv1000? Thanks!

  62. Dawn says:

    Hi all,

    Hope someone can point me in the right direction (LCD Screen, Crimped Cable, Backlight, Battery?????)

    I have a Toshiba L505D-S5992 Satellite laptop. Recently the display began to dim after the laptop screen is lifted to a certain point (i.e. 1/2 way). The symptoms after hitting that 1/2 mark (same every time) are consistent with an Inverter/Backlight failure. I replaced the Inverter and still have the same problem. The LCD is normal (no spots, lines etc… until the LCD screen is lifted to 1/2 way then the screen Darkens to black although you can still feintly see the image if you shine a light or look closely enough. Attaching an external monitor works fine.

    Any feedback would be great!
    Dawn

  63. Repair Man says:

    @ Dawn,

    Recently the display began to dim after the laptop screen is lifted to a certain point (i.e. 1/2 way).

    Probably this is video cable related issue.
    1. check connection between the video cable and motherboard.
    2. check connection on the back of the LCD screen.
    3. replace video cable.

  64. Dawn says:

    @ Repair Man

    Thanks!

  65. ambersky says:

    Hey Please help me my laptop works just fine But the screen In dimmed and i can get it any lighter!I can see the screen saver but it is very dark! Im getting worried is this just cuz the back light has blown!??

  66. Repair Man says:

    @ ambersky,

    my laptop works just fine But the screen In dimmed and i can get it any lighter!I can see the screen saver but it is very dark! Im getting worried is this just cuz the back light has blown!??

    Most likely it’s either bad inverter board or failed backlight lamp (inside the screen).
    You cannot tell which one is causing the problem without testing the laptop with spare inverter or backlight.
    If you have no spare parts, I would try replacing the inverter board first. There is a good chance to fix the problem.

  67. joehe4 says:

    i have a sony vaio vpc-eb1j1e at start up it goes fine, but after the windows has open my screen starts to flicker and went black. i already check it by replacing the inverter and the thing happen, is this might be the backlight problem, is it possible to change the backlight??…

  68. kayla younger says:

    i have an hp laptop, everything work completely fine on it and it is not slow at all. my only problem is ever since i first got it aall the darker colors or sometimes just the black color to anything is this bright fuzzy looking red color, it use to fix its self and go back to normal but now it stays that way constantly. i cant look at pictures or watch movies or anything like that because of the color.

  69. Repair Man says:

    @ joehe4,

    but after the windows has open my screen starts to flicker and went black. i already check it by replacing the inverter and the thing happen, is this might be the backlight problem

    Yes, it’s very likely that your problem related to the backlight lamp failure.

    is it possible to change the backlight?

    Yes, it’s possible but not easy.

    When CCFL fails, I recommend replacing the entire screen.

  70. Repair Man says:

    @ kayla younger,

    my only problem is ever since i first got it aall the darker colors or sometimes just the black color to anything is this bright fuzzy looking red color, it use to fix its self and go back to normal but now it stays that way constantly.

    Please test your laptop with an external monitor. Do you see same red fuzziness on the external image or it’s working properly?
    Were you able to fix it before by moving the display back and forth?

  71. Isaac says:

    My laptop boots up and i see a faint logo and then all goes black. The lights on the inverter seem to be working normally.

    I got a new screen but it came with the wrong back light plug (two pin vs. Ribbon). I tried booting up with the new screen without connecting the two pin back light and i get the same result; faint logo and then all goes black

    to me it seems the inverter is fine but the back light on the old screen is gone and once i find a replacement screen with a ribbon connector i should work?

    Does it seem like the back light or inveter is faulty to you ?

  72. Arvind says:

    Hi,
    My Toshiba Satellite A200-TR6 Laptop’s LCD screen is very faint however external monitor works fine.

    Laptop’s back light bulb sometime works fine for hours but most of the time remains very faint. I already replaced inverter board which didn’t help.

    Is it back light bulb working intermittently or the input voltage and or control signal to inverter are intermittent?

    How can I verify if input to inverter is not causing problem?

    Thanking you in advance…

    Arvind

  73. bob says:

    hi the color black or any darker colors are green everything else is
    mostly fuzzy but i can still tell what thisgs are

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  1. Screen inverter board >> Laptop Parts 101 says:

    […] inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. The inverter board converts low voltage DC power (few volts) […]

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