I need help on this laptop lenovo 310 NM-A751 rev:1.0 , the problem is turns on but screen is black and i see flicker, so i tried replacing good screen same results, tried rehet u5 CHIP its working for a whille, but it comes back again same issue, so tried replacing U5 chip same results.I noticed that on U5 pin4 PCH_ENVDD voltage from 3.3v fluctuating.Anyone can help on this please , attached is the schematic
LENOVO 310-141bk
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Re: LENOVO 310-141bk
Also noticed PQ801 source is shorting to gate beeping and , could it be this mosfet is the prob?anyone please helpLast edited by String2016; 01-19-2022, 02:40 AM. -
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Re: LENOVO 310-141bk
When you have the unit on, press the key caps key on your keyboard - do you see the LED toggle on / off ?
While on, if you apply a flashlight on the front face of the LCD - can you see any of the graphics on the LCD panel ?
Does an external monitor work with this unit ?
Trying to understand if the fault is with the backlight or something else on this unit.Comment
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Re: LENOVO 310-141bk
@mon thanks for the response the unit is working fine before until it stock for a couple of days, its working fine on external on internal screen flashing tried replacing good screen same results, notice U5 PIN4 PCH_ENVDD voltage is fluctuatingComment
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Re: LENOVO 310-141bk
Problem solved, R1 resistor is the culprit replaced it and its working fine nowComment
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