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820-2850 1/4 fan spin

nate8organic

nate8organic

New member
got in a 820-2850 with a good green light and orange with battery plugged in. it powers on to 1/4 fan spin. was liquid damaged. i took the power rails down, it only gave me voltage when the fan is spinning.
it appear pp18v5_s3 and pp1v05_s5 are missing.

PM_SLP_S3_L -3.32v

PP0V75_S0_DDRVTT - .75v

PP18V5_S3 - 0v

PP1V05_S0 -1.05v

PP1V05_S0GPU -1.05v

PP1V05_S5 -0v

PP1V0_FW_FWPHY -1.4v

PP1V2_ENET -1.19v

PP1V2_S0 -1.18v

PP1V5_S3 -1.5v

PP1V5_S3RS0 -1.49v

PP1V8R1V55_S0GPU_ISNS -1.34v

PP1V8R1V55_S0GPU_ISNS_R -1.34v

PP1V8_GPUIFPX - 1.8v

PP1V8_S0 -1.8v

PP3V3_ENET -3.32v

PP3V3_FW_FWPHY -3.31v

PP3V3_S0 -3.31v

PP3V3_S0GPU -3.32v

PP3V3_S3 -3.3v

PP3V3_S5 -3.32v

PP3V3_S5_AVREF_SMC -3.3v

PP3V42_G3H - 3.38v

PP5V_S0 -5v

PP5V_S3 -5v

PP5V_S5 -5v

PPBUS_G3H -12.58v

PPDCIN_G3H -18.88v

PPVCORE_GPU -.90v

PPVCORE_S0_CPU -1v

PPVCORE_S0_GFX -.87v

PPVP_FW -13v

PPVTTDDR_S3 -.75v
 
nate8organic

nate8organic

New member
well the only thing i am confused about is where 1v05_s5 is getting connected to power if U7740 is not attached, also c7740 and c7741, r1825 etc are also not attached those are the only places on the board 1v05_s5 shows up. and they are not suppose to be there i checked with other boards, but the schematics do not say no stuff.

should PP18V5_S3 be present also?
 
D

dukefawks

Administrator
Ugh, so you didn't even check if the parts are even on the board. Of course there is no 1V05_s5 if U7740 is not there. Look at the note with U7740 why they thought it might be needed.
18V5 is for trackpad, who cares?

Where was liquid damage?
 
nate8organic

nate8organic

New member
okay i understand. right that is what i was thinking. the liquid shows bad signs around the graphics and cpu, also like wise on the back side center top area everywhere around the isl6263, i ran it through the UC because it was under the big chips.
 
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