Привет. Всем знакомая материнская плата. Один раз делалв UMA по китасйкому мануалу, все было хочошо. сегодня принесли еще один. сделал как прошлый раз, но видео нет. подсветка включается, но изо отсуствует, только серый фон. на осцолографе не видно 25Мгц. кварц менял, без изменении. у кого встречался такая проблема и как решили?

Maybe your problem little mistake for reason please check your procedure and ı send for you uma pdf.And check 25khz oscillate is near 1 megaohm resistance (not 1000ohm or 100 khm)(the two capacitor shared).if quarantee you can use oscillate other damage board pull.Sincerely yours.

Your problem is that you do not have background image the problem might come from kbc
With the plate information maybe I can help you

I did as in PDF

Check in connector lcd1 pins 1,2,3 that you have 19v
Pins 5,6,7,8,9,11 have 3.3v
All this you have to do with the connected screen connector
Check that the F5401 fuse is not blown

in pins 1,2,3 -19v. in 5,6,7,8,9 - 3.3v. 11 pin- 0v, in 11 pin no short circuit, 56kom.
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There is no generation of quartz 25 MHz. I changed quartz, but without result(((

I have no idea what the ic is missing the clock signal 25Mhz PHC KBC or the graphic chip
What crystal are you measuring?

XTAL-25MHZ

What I would do is do a reflow to VGA1 and if it does not give you video
Then make a reflow to the PCH
That way you realize which is the one that needs reballing

It may also be that the bios gives you that problem

I could not remake UMA. I put a discrete video. Thanks to everyone who participated!!!!