IndiaReFix - Laptop & TV Repair Forum

dspok

Satish, please check BL_PWM and BL_EN signal. Pin no.35 and 36 both must be 3.3v

dspok

Hello masters, I have Dell N4030 UMA and Lenovo B570e UMA with shutting down problem. Sometime it works for 10mins and it shutsdown, sometime shutsdown instantly after I press power button. All together machine shutsdown randomly without any warning. Changed SIO, changed ECRST transistors, changed P...

dspok

Nikul,

If backlight is completely black then check BL_PWM and BL_EN signal both should be 3.3v

If both signal are present then make sure backlight itself is faulty.

dspok

Laptop totally dead to sign of life.
Q29 not working but ok. Changed gate controller of Q29, which is Q53.

Now mains short but drain of Q29 not grounded. Checked and found C5 near USB port shorted, changed it. Now machine works fine.

dspok

Thanks ali..

dspok

BIOS chip should be W25Q64BV and it is 1.8v operated chip. I mean if there is 1.8v then it is ok.

dspok

Did you reflow PCH?

dspok

Try the RAM rails to controller. Maybe on or more rails are open.

dspok

naeemsapk,

attached, please check and let me know.

dspok

Check UG1 5 leg transistor.

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