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G580 (LA-7981P) backlight and screen color.
https://vlab.su/viewtopic.php?f=58&t=14726		 Страница 1 из 1
spidey [ 31 июл 2013, 11:12 ]
Заголовок сообщения:  G580 (LA-7981P) backlight and screen color.
hi,
when came to me, there was no backlight. BKOFF# was 0V, so DISPOFF# = 0V, i connected +3v to dispoff# now back light is ok, but another problem ; screen back color is green now. i replaced lcd screen with a new one, now its ok, back color is black. But this time, text is purple. :) any suggestions ?
thanks!


i changed with another new screen and the back color is green again. So i think original screen is also OK. Please some advice, why it is green ?
RsM [ 31 июл 2013, 11:24 ]
Заголовок сообщения:  Re: G580 (LA-7981P) backlight and screen color.
Check resistance on LVDS pairs to gnd.
There is a discrete GPU or CPU only?
spidey [ 31 июл 2013, 12:25 ]
Заголовок сообщения:  Re: G580 (LA-7981P) backlight and screen color.
There is a discrette GPU, NVidia N13p, switchable graphics. But LVDS_A0..A2 pins are connected to hub.

pin 13. A2 = 2m ohm
pin 14. A2# = 2m ohm
pin 15. A1 = 0,46 ohm
pin 16. A1# = 23k ohm
pin 17. A0 = 2m ohm
pin 18. A0# = 2m ohm
RsM [ 31 июл 2013, 14:06 ]
Заголовок сообщения:  Re: G580 (LA-7981P) backlight and screen color.
spidey писал(а):
n 15. A1 = 0,46 ohm
pin 16. A1# = 23k ohm

differ from other, isn't it? :-):
and all LVDS pairs go to hub...
spidey [ 31 июл 2013, 14:15 ]
Заголовок сообщения:  Re: G580 (LA-7981P) backlight and screen color.
yes it is, so should i reflow the hub ? (hm76) i cant find a new one.
RsM [ 31 июл 2013, 15:16 ]
Заголовок сообщения:  Re: G580 (LA-7981P) backlight and screen color.  [РЕШЕНО]
no reflow, need to change to a new one.
http://www.recomb-omsk.ru/index.php?productID=4176
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