820-2936 - liquid damaged, fan spin but no chime, no display

Alan.L

Member
green light, fan spin, but no post:
no light on usb mouse, can charge battery.



PPBUS_G3H 12.56V

PPBUS_S5_HS_OTHER_ISNS 12.56V

PPDCIN_G3H 16.5V

PP3V42_G3H 3.49V

PPVRTC_G3H 3.31V

PP5V_S5 5V

PP5V_S3 5V

PP3V3_S0 3.3V

PP3V3_S5 3.3V

PPVCORE_S0_CPU 1.1V

P5V_S0_CPUIMVP_VDD 4.9V

ALL_SYS_PWRGD 3.3v

U7400 =
pin1 3.3v
pin2 0.5v
pin40 5.0v
pin24 5.0v
 

Alan.L

Member
changed smc, tried a bios from donor board and its still same. any other suggestion?
 
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Alan.L

Member
changed clock chip and Y2805 still same.

clock chip
pin1 3,3v
pin2 3.3v
pin11 1.8v
pin12 3.3v
pin13 3.49v

the front white led always on, does this mean anything?
 
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Alan.L

Member
the front white led always on, does this mean anything?


u4100 area is corroded but its only firmwire stuff.

i've tried ultrasonic the board but still no good.

should i give up
 

smiba

New member
Just to be sure, have you placed back the original BIOS chip after trying out one from a donor?

I think if you're in bad luck the ME area can differ enough to actually prevent the system from passing POST
 

dukefawks

Administrator
No it can't. It is corrosion somewhere and I cannot help with that unless I can see the board myself. I'm afraid this board has reached donor status now.
 
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