[SOLVED]820-2936 green and orange light but wont turn on

[nate8organic]

got in a 2936 with a green light and orange light with battery in, but no fan spin and wont power up. also the fan spins with a smc bypass. i will test all the rails to see if anything is missing, it is a heavily liquid damaged board.

 

[nate8organic]

PPVIN_SW_T29BST -.34v

PPBUS_S5_HS_COMPUTING_ISNS - 12.57v

PPBUS_S5_HS_OTHER_ISNS -12.57v

PPDCIN_G3H -18.87v

PP3V42_G3H - 3.48v

PPVRTC_G3H - 3.32v

PP5V_S5 - 5.03v

PP5V_SUS - 5.03v

PP5V_S3 - 5.03v

PP5V_S0 - 5.03v

PP3V3_S5 - 3.32v

PP3V3_SUS - 3.32v

PP3V3_S4 - 3.32v

PP3V3_S3 - 3.32v

PP3V3_S0 - 3.31v

PP1V8_S0 -1.8v

PP1V5_S3 -1.5v

PP1V5_S3RS0 -1.5v

PP1V5_S0 -1.5v

PPVTTDDR_S3 -.75v

PP0V75_S0_DDRVTT -0v

PPVCCSA_S0_CPU -.90v

PP1V05_SUS -1.06v

PP1V05_S0 -.04v
(.026v to gnd in diode mode)

it appears PP1V05_S0 is not present.

 

[dukefawks]

Resistance to GND on 1v5_s0?

 

[nate8organic]

.342v to gnd in diode mode on pp1v5_s0. i do have 1.5v there also.

 

[aprendiz]

I guess it was a typo, maybe Duke is asking for resistance on the missing voltage rail.............

CPUVCCIOS0_EN present????

 

[nate8organic]

Well if that is the case i have the resistance listed
PP1V05_S0 -.04v
(.026v to gnd in diode mode)

Yes CPUVCCIOS0_EN is 3.24v on pin 3 of the u7600

 

[aprendiz]

ok resistance is not the same as diode mode!!

 

[dukefawks]

Enable is there and there seems to be no short, I will let you decide what could be the problem.

 

[nate8organic]

okay replaced the u7600 and everything's working. (solved)