Laptop: HP G60 230us
OS: Vista Home Premium
I was called to fix this laptop due to the screen being dark (failed inverter and backlight). The CCFL had scorch marks and had melted where the wire attached from the inverter. After replacing both the inverter and CCFL in the LCD panel the screen turned on and worked normally to the windows login screen, then I powered down to finish reassembling the rest of the laptop. When I had finished I turned on the laptop again and found everything on the screen completely garbled. I ordered a replacement LCD panel and cable, assuming that I had damaged the panel since it was the first time I'd opened one up to replace a CCFL. Even with the new panel and cable the problem remains.
Instantly upon pressing the power button a pattern of lines appears and slowly fades to different colors through the boot process, eventually settling to mostly white/greenish with a black bar down the center of the panel when it sits at the login screen for a minute. No splash screens or POST are visible.
Output through VGA or HDMI to external monitors works normally.
Am I going to be replacing the mainboard on this now? Any ideas why this might have happened?
(The customer has a $3000 software license attached to this 6 year old laptop so replacement isn't an ideal option for him)
I am a new PC Technician and don't have a lot of interaction with co-workers or other techs (on-site tech company) so any advice you may have will be considered valuable to me. Thank you in advance.