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[SOLVED]820-3437 Quarter fan

G.Beard

G.Beard

New member
Board has been repaired before.
No visible damage / corrosion.
I’m totally without a clue.
Has the cheapest shittiest battery ever. No idea who fitted it.
ISL6259 pin 17/18 = 2.2Ohms

All_SYS_PWRGD = Pulse 3V4

PPBUS_G3H = 8V6
PP3V42_G3H = 3V42
PPVRTC_G3H = 3V34
PP5V_S5 = 5V
PP5V_S4RS3 = pulse 5V
PP5V_S0 = pulse 5V
PP3V3_S5 = 3V3
PP3V3_S4 = = Pulse 3V3
PP3V3_SUS = 3V3
PP3V3_S3 = Pulse 3V3
PP3V3_S0 = Pulse 3V3
PP3V3_S4SW_SNS =
PP1V8_S3 = Pulse 1V8
PP1V2_S3 = Pulse 1V2
PP1V05_SUS = 1V05
PP1V5_S0 = Pulse 1V5
PPVCC_S0_CPU = Pulse 1V8

U6100 all trace continuity is good and all resistors around U6100 chip measure correct value.

Any help please?
 
D

dukefawks

Administrator
CPU Vcore pulsing too? U1950 pin 8? Measure all continuity between the termination resistors, traces could be fucked.
 
G.Beard

G.Beard

New member
CPU VCC pulsing.
Pin 8 U1950 3V4 stable

U6100, Tested again everything off every pin. Traces are in tact and resistor values are all good.

Pin 6 high then falls and fan clicks on
pin 5 hi then falls and fan clicks on
pin 2 3V3

pin 3 3V3
Pin 1 3V3
Pin 8 VDD 3V3
Pin 7 3V3
 
Last edited:
D

dukefawks

Administrator
Pulsing power means the CPU is not starting to run code. This could be 100 different things. The usual is the data lines to U6100, but anything else can cause this too. Only thing I can say is inspect for corrosion, maybe under SMC, anything is possible.
 
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