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820-3462-A Green Light and Charges - No fan spin / power - Liquid Damaged

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dukefawks

Administrator
PPBUS is needed first. 1.1V would almost suggest there is a short to GND, so check that first. Light should also go orange even without a battery, but that can be dealt with after PPBUS.
 
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Hellfiya

Member
You're correct, something is pulling ppbus down to 500ohm resistance to ground. I'm going to look around the line until further instructions

EDIT: I have 12.3v on ppbus now and amber light without battery, it turned out to be a bad ISL6259 solder job or IC... still no fan spin or power

seems off: pm_slp_ s5_L is 3.3v, S4_L is .4v, S3_R_L,_L is 3.3v

PP5v_S4 is 5v, S3 missing, S0 is 5v

PP3V3_s3 1.4v, pp3v3_s0 is at 3v3

ppvccsa_s0_reg at .9v

cpu and pch gets warm,
 
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dukefawks

Administrator
12.3V would at least mean the ISL is not talking to the SMC, but that is a later concern but expect a dead SMC.

Is P5VS3_EN present? ALL_SYS_PWRGD present?
 
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Hellfiya

Member
SMC did have quite a bit of corrosion on the test points surrounding it, I would not be surprised. I will check those two circuits when I get back to my workshop. Thanks Duke for your help
 
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Hellfiya

Member
I'm getting 4.9v on pin 3(P5VS3_EN_L of q7852(SSM3K15FV), but not pin 1(No _L; 15ohm resistance to ground which seems short), which schematics show they should both be on. I tested and see the low resistance is on the PM_SLP_S4_L side. I forgot to mention U7940 has been replaced before, the PM_SUS_EN ic.

ALL_SYS_PWRGD is not present.
 
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