Fujitsu LCD replacement troubleshoot

By lancer1
Apr 13, 2009
Topic Status:
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  1. I order a new screen and replaced it but get nothing. I tried the old cracked LCD and got nothing there either, so I don't think it is a problem with the screen. I also hooked up an external monitor so I know the video card is working, just no output to the LCD screen.

    I think the laptop "close" switch is working because when I close the laptop it goes into hibernation mode.

    What else could cause the screen to not come on?

    Thanks
  2. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,732   +156

    The LCD inverter could be bad or the cable from the motherboard to the LCD panel is bad
  3. lancer1

    lancer1 Newcomer, in training Topic Starter

    Thanks, I will check this out. But these seemed to be working fine when I pulled out the broken LCD a month ago - are they sensitive to handling and could that have caused it? it just seems like these components are separate enough that this would seem unlikely but maybe not.

    Again, thanks for your help.

    Lancer
  4. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,732   +156

    Were the hinges or the LCD broken away from the rest of the laptop, or was the LCD panel just cracked?
  5. lancer1

    lancer1 Newcomer, in training Topic Starter

    The LCD panel was cracked. In fact, parts of the LCD screen were still visible or usable. The hinges and connection to the main system seemed to be OK
  6. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,732   +156

    Ok... are you sure that the replacement LCD Panel is an exact replacement to the original? The inverter could have shorted out
  7. lamo

    lamo Newcomer, in training Posts: 570

    we should remember, that any LCD contains eeprom with specifications of LCD-module. some laptops do checking of this info with information stored in bios rom. if eeprom isn't correct - laptop won't show anything.
  8. lancer1

    lancer1 Newcomer, in training Topic Starter

    Tmagic -

    in fact there is a slight variation in the model # that I did not notice (received SHARP LQ106K1LA03 - the last digit should be a 2). The prices differ significantly online so I assume I received a cheaper product that is not compatible. The invoice reflects the "2" so I should be able to return it, however the old screen now doesn't work so I am worried that plugging in the "3" model did something.
  9. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,732   +156

    Well that "slight" variation could be the key to no video, but you might be ok returning it for the proper part. I think it will work ok, because of LAMO's eeprom post. LAMO really is Techspot's laptop guru :grinthumb
  10. kimsland

    kimsland Ex-TechSpotter Posts: 18,353

    Unrelated
    I agree, except lamo is not good on laptop passwords ;)
  11. Tmagic650

    Tmagic650 TS Ambassador Posts: 20,732   +156

    Well Kimsland, we can't have everything can we ;) I hope lancer1 can get the proper LCD panel and that he gets video back
     
  12. lancer1

    lancer1 Newcomer, in training Topic Starter

    Thanks, I'll let you know how it turns out. -Lancer1
  13. lamo

    lamo Newcomer, in training Posts: 570

    kimsland, i can remove any password from any laptop,including newest sony and dells. but i don't provide this service via internet/icq/mail. and i won't do this in the future.
  14. kimsland

    kimsland Ex-TechSpotter Posts: 18,353

    I knew that and that was also my point
    You must have known that I knew that already, actually that's why I posted
    Glad it's sorted then, you cannot help in this area on the forum
    Well obviously I'm more helpful in that area to others ;) Maybe one day you could try helping too, when you can do this, but by the sounds of that, it will likely never happen. :suspiciou
    Thank god for me hey :grinthumb, because lamo has confirmed he cannot help in this area.

    I write the above so as to quote myself if ever needed ;) Actually here's that quote:
  15. lamo

    lamo Newcomer, in training Posts: 570

    hmm, there's some new things i've discovered about this issue. according to this:
    http://beyondinfinite.com/lcd/Library/Sharp/LQ106K1LA03.PDF
    these modules don't have eeprom inside :( and also i haven't found the 02 revision datasheet. so, i think, there's no difference between these two revisions of these LCD-modules.
    again, check carefully connections between LCD,MB. if you have multimeter, check the resistance between GND and 1st pin of the LCD-screen, while connected(don't forget to power off laptop before measuring!!!!!).
  16. lancer1

    lancer1 Newcomer, in training Topic Starter

    Thanks. I haven't had time to take apart the laptop but probably this weekend.

    Since I have a working (albeit cracked) LCD screen LA02, I will test against this and then try the LA03. The problem at the moment is they both don't show any video (as if the screeen was unplugged), so I am diagnosing another potential issue with the connector to the motherboard or the inverter not working. I don't think the laptop-close-switch is an issue because when the lid closes the laptop goes to sleep as it should.
  17. lamo

    lamo Newcomer, in training Posts: 570

    according to datasheet this screen has led backlight. so there's no inverter in separate logic board. inverter logic is embedded in LCD-module. actually, there might be difference between several revisions of these LCD-modules. my expirience with such type of screens isn't quite big, but you always can download datasheet for several revisions of LCDs, and compare them :)
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