This is the problem it needs reflowing. will not boot with this not connecting properly, and leaving this laptop on for long times like this it will shut down as you are cooking the board. and that will damage the board and other parts. might just be a better idea to change the board, if using windows 10 you need to install the original windows with the same windows key that your windows 10 was upgraded with or you will need to buy a new windows key.
SOURCE: i have a hp tx2120 laptop and the is no display on
If it sounds like the computer is booting up properly, then it could be that the backlight has gone bad. This would require service from a professional.
SOURCE: laptop hp compaq tc 4400
Whenyou connect the power adapter into the laptop, does the power LED lightup? If not then - The battery adapter or the adapter's power lead or the laptop's powersocket could be faulty. Check power adapter's DCplug that connects into the laptop power socket with a multi-meter, the voltageshould be slightly higher than the voltage that is printed on the label on thebottom of the adapter. If the voltage is zero or way below the voltage that isprinted on the label then the power adapter is faulty and needs to be replaced. If the adapter is OK thenconnect it to the laptop and power it up, then look at the power/batterycharging LED light and wriggle the power plug in the laptop's powersocket. If the power/battery LED light flashes and in a certain position thisLED light stays firm, then the power socket is either faulty or it has a drysolder joint where it is connected to the motherboard. This can be repaired but itrequires the laptop to be completely dismantled to get at this power socket andrepair. If you cannot DIY then I suggest you get a quote first.
SOURCE: My hp tx2120 us was
You may have finally run into the dreaded "defective GPU" issue, that plagued HP and other manufacturers. Thousands of defective Nvidia chip sets were used in the manufacture of these laptops and if you got one of these, it would last about a year, then fail, in the just the way you describe. If you were out of warranty, HP took the low road and refused to fix them, unless you ponied up $450. Then they replaced the defective motherboards with a new one, with exactly the same component.
If you have one of these, you will better of buying a new machine. I'd avoid HP though.
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