Alienware LA-9331P - LCD work only when inserted HDMI

[ktmmotocross]

Hello.
Have this Alienware LA-9331P, that have no video/only BKL/ and 8 beeps/LCD error/. But when insert HDMI, LCD works ok.

Board is buyed as refurbished from aliexpress and i found bad soldering on ic UV31

Can anybody point me to signal that can be bad? i think it is some LCD detection

Link to Schematic https://www.badcaps.net/forum/troubl...331p-schematic

[Scotchmist]

Re: Alienware LA-9331P - LCD work only when inserted HDMI

Check the LCD cable from the motherboard to the screen, could be loose, bad connection or broken wire

[dellxps15]

Re: Alienware LA-9331P - LCD work only when inserted HDMI

Hello.
Have this Alienware LA-9331P, that have no video/only BKL/ and 8 beeps/LCD error/. But when insert HDMI, LCD works ok.

Board is buyed as refurbished from aliexpress and i found bad soldering on ic UV31

Can anybody point me to signal that can be bad? i think it is some LCD detection

most of that notebook that had installed windows 10 + evga precision software got edp lcd bios panel corrupted.

if internal lcd is working, make a dump of its internal edp and compare to others. with a live linux distro u can restore that firmware

[SMDFlea]

Re: Alienware LA-9331P - LCD work only when inserted HDMI

It could be switching problem rather than the EDID.Check UV27,UV28,UV29,UV27.

EDIT: just remembered about an old thread where that U27 chip gave some problems with a snowy screen

https://www.badcaps.net/forum/showth...t=PI3LVD1012BE

.

[ktmmotocross]

Re: Alienware LA-9331P - LCD work only when inserted HDMI

what to check on it? what signal can be bad when display works ok

[ktmmotocross]

Re: Alienware LA-9331P - LCD work only when inserted HDMI

what to check on it? what signal can be bad when display works ok

try to replace UV31 but still the same

[ktmmotocross]

Re: Alienware LA-9331P - LCD work only when inserted HDMI

Ok so it is maybe my fault. i put in GTX970 which on older bios like this A14 dont work normally. i put in GTX770M and it work normally.

Try to put in never bios so that 970 can work