820-01598 no backlight.

Kyle93

Member
Arrived with very little liquid damage on lcd connector. Works fine with external.

PPVOUT_S0_LCDBKLT only .567V

D8410 pin 1 0.050V pin2 .567v

EDP_BKLT_EN 0V

No short to grounds and already replaced LCD cable. Screen and board connectors look good

PP5V _S0SW_LCD 5V

What next??
 

2informaticos

Administrator
Staff member
3V3_S0SW_LCD present too?
Do you get image at least?
DP_INT_HPD goes high?

I bet for damaged CPU eDP output.
Check diode mode to ground on eDP lines of J8500.
 

Kyle93

Member
3V3_S0SW_LCD was 0v Replaced u8501 now 3V3_S0SW_LCD 3.3V

DP_INT_HPD 3.3v pin 1 R4830 but 0v on pin 2. R4830 measures good.

LookS like Q4830 needs to be replaced.

Im assuming Q4830 cant be replaced from A 820-00850 since this one uses a SSM6N15AFEAP and 00850 uses DMN5L06VK-7

Know any other donars by chance that have the correct chip or sounds like this will have to be special ordered??
 

2informaticos

Administrator
Staff member
Don't expect the same voltage for XDP_DP_INT_HPD as for DP_INT_HPD; depends of DP_INT_HPD_MASK level.
Do not change Q4830 without reason.

As you now have 3V3_S0SW_LCD, check EDP_BKLT_EN and backlight output voltage.
 
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