Hi,
I am fighting with this laptop and I am suspecting of the GPU, but it would be great to know your opinion.
The laptop originally does show black screen (no back light) but the power button LED turn on and off when pressing it.
I did the next trouble shooting with no changes
- Disconnected the battery and try just with the power supply
- Disconnected all power sources, even the CMOS battery and held the power button for 40sec.
- Disconnected hardrives
- Deplaced the RAM
- Disconnected the Wifi module
- I connected a external monitor to the HDMI port
NO changes here.
Troubleshooting that did make changes:
- The motherboard was taken out from the computer. Keeping the heatsinc.
- When the CMOS battery is disconnected it seems to turn on as soon as you connect the power supply.
- The laptop monitor is disconnected
- I connected a HDMI monitor
- After a while, the monitor showed image, like a glitchy BIOS (uploading picture)
- After some tries removing the external power and powering it again, it start working "fine"
- Looks like being warmer it powers on faster and the image ends being fine.
- I used the occasion to reload the BIOS (having to connect the battery for that).
- At some point it looked like it was working even if it was no so hot.
- I mounted the motherboard back, connected the laptop monitor together with the HDMI monitor and again I got nothing (black screen), but I plugged a USB and the light was blinking.
- As soon as the laptop monitor is connected nothing happens.
The resistance to the GPU power line (if I got the right one as I don't have the schematic) to ground is 0.5 Ohms.
When I took off the heatsinc to inspect it I noticed the previous person put a lot of thermal paste. I cleaned it and put just enough, but no changes.
It completely looks like a dead GPU, but the fact that the laptop monitor seems not to work, makes me think that something else might be wrong.
Ah... one of the times I let the computer off and the battery charging (it was 40%). After 1h or so I came back, disconnected all power sources, and I was measuring some MOSFETs. Then I connected everything back (except the laptop monitor, external monitor connected) I press the button and it powered on right away with perfect image. The computer was cold, because even the fans were not spinning. That also is giving me some hope. Then I connected the laptop monitor and everything went back to what it was before, black screen, and glitcht externam monitor when I disconnected the laptop monitor.
The voltage that get to the LVDS is 20V
Any ideas are appreciated. Thanks!!
I am fighting with this laptop and I am suspecting of the GPU, but it would be great to know your opinion.
The laptop originally does show black screen (no back light) but the power button LED turn on and off when pressing it.
I did the next trouble shooting with no changes
- Disconnected the battery and try just with the power supply
- Disconnected all power sources, even the CMOS battery and held the power button for 40sec.
- Disconnected hardrives
- Deplaced the RAM
- Disconnected the Wifi module
- I connected a external monitor to the HDMI port
NO changes here.
Troubleshooting that did make changes:
- The motherboard was taken out from the computer. Keeping the heatsinc.
- When the CMOS battery is disconnected it seems to turn on as soon as you connect the power supply.
- The laptop monitor is disconnected
- I connected a HDMI monitor
- After a while, the monitor showed image, like a glitchy BIOS (uploading picture)
- After some tries removing the external power and powering it again, it start working "fine"
- Looks like being warmer it powers on faster and the image ends being fine.
- I used the occasion to reload the BIOS (having to connect the battery for that).
- At some point it looked like it was working even if it was no so hot.
- I mounted the motherboard back, connected the laptop monitor together with the HDMI monitor and again I got nothing (black screen), but I plugged a USB and the light was blinking.
- As soon as the laptop monitor is connected nothing happens.
The resistance to the GPU power line (if I got the right one as I don't have the schematic) to ground is 0.5 Ohms.
When I took off the heatsinc to inspect it I noticed the previous person put a lot of thermal paste. I cleaned it and put just enough, but no changes.
It completely looks like a dead GPU, but the fact that the laptop monitor seems not to work, makes me think that something else might be wrong.
Ah... one of the times I let the computer off and the battery charging (it was 40%). After 1h or so I came back, disconnected all power sources, and I was measuring some MOSFETs. Then I connected everything back (except the laptop monitor, external monitor connected) I press the button and it powered on right away with perfect image. The computer was cold, because even the fans were not spinning. That also is giving me some hope. Then I connected the laptop monitor and everything went back to what it was before, black screen, and glitcht externam monitor when I disconnected the laptop monitor.
The voltage that get to the LVDS is 20V
Any ideas are appreciated. Thanks!!
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