Hi. So, I have a board here that came in with no backlight, but had full video. I could see folder with question mark. I even ran Ineternet recovery on it. In my attemp to fix the backlight issue I replaced C9020 and C9796 because they looked burnt. Also L9080 was missing completely so I replaced that as well. Turned the laptop on to see if it made a difference and I got a chime with a quick flash from the backlight and no video whatsoever. Just darkness. Started measuring around and this is how far I got before things got worse.
U900 PN 4,5 3.2V
LCD_IG_EN 3.2V
Upon measuring pins 2,3,4 on LVDS voltage started at 3.3 and dropped until I noticed that L9004 had pretty much imploded into a bubble at some point during taking measurements. It burnt out pads and traces going to pin 2 of C9015 and 2,3 of LVDS connector. I the replaced L9004 and ran jumpers for the damaged traces. Now when I turn on computer I get the same quick flash of backlight, but now with colorful horizontal lines which stay on the screen when backlight goes off.
I apologize for the long post. I just wanted to be as detailed as possible. Thank you in advance to anyone who comes across this and can help.
Have a good one.
U900 PN 4,5 3.2V
LCD_IG_EN 3.2V
Upon measuring pins 2,3,4 on LVDS voltage started at 3.3 and dropped until I noticed that L9004 had pretty much imploded into a bubble at some point during taking measurements. It burnt out pads and traces going to pin 2 of C9015 and 2,3 of LVDS connector. I the replaced L9004 and ran jumpers for the damaged traces. Now when I turn on computer I get the same quick flash of backlight, but now with colorful horizontal lines which stay on the screen when backlight goes off.
I apologize for the long post. I just wanted to be as detailed as possible. Thank you in advance to anyone who comes across this and can help.
Have a good one.