HP laptop lights up but the screen isn't

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citsar Posts 1 Registration date Sunday April 3, 2016 Status Member Last seen April 3, 2016 - Apr 3, 2016 at 12:57 AM
KY_WD Posts 2053 Registration date Thursday October 23, 2014 Status Member Last seen February 28, 2017   - Apr 6, 2016 at 03:24 AM
Hello,
my laptop is HP G42.
battery isn't functioning well, but it's fine.
the power indicator is off, but the wifi indicator is on, and the fan moves, i think it starts up fine.
the screen stays blank. i don't think it's a black screen. no light or any difference at all even when i start the engine in a complete darkness.
i used to use this for gaming, like mmorpg etc.

i've :
1. reseat RAM, battery
2. clean the fan
3. replace the thermal paste
4. press the power button for around 1 minute when the battery is out (no power connected)

please help if there's anything i can do with it, thanks...
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1 response

KY_WD Posts 2053 Registration date Thursday October 23, 2014 Status Member Last seen February 28, 2017   122
Apr 6, 2016 at 03:24 AM
Hello citsar,

In situations like this it's recommended connecting the laptop to an external monitor to see will there be any video signal going out from the laptop. If it does go out, then there's a need for a LCD inverter replacement. If there's nothing showing either on external monitor nor display, but the fans are still working, the problem that you have may be due to the failure of the video chip. Sometimes, after much of a use and less cooling the graphics processor which is responsible for video signal transmission get unsolders, the thermic paste goes away and it gets unsoldered, therefore the screen doesn't show anything. If you possess knowledge of notebooks' hardware you can change the paste yourself by opening the laptop and check if the chipset that is next to the processor has got unsoldered or you can bring your laptop to a technician to get it soldered again.
Keep me posted on the case.

Hope I gave some ideas. Cheers.
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