820-3478 No power

iClub

Member
Lights up 1 led, client reports that it turned off unexpectedly.

Voltage: PP12v_s0 12,12V
12_s5 12,11V
PP3v3_s5 3.3V
5v_s5 5,098V
PP5V_S4 5,1V
pp3v42 3,4V
PM_SLP_S5_L 3.3V pulses when triggering SMC_ONOFF_L.
 

2informaticos

Administrator
Staff member
If you really get 12V_S0, then must have voltage on several coils.
Is more important to post them, instead of S5/4 voltages; S0 can't come on, if S5/4 are missing.
 

iClub

Member
L7610 3,31V
L7650 5,098V
L7310 1,5V
L7800 12,2V
L7720 1,063V
L7910 0,901V
L7930 0,904V
L7950 0,904V
L8050 0,904V
L7100 12,1V
L7710 1,5V
L8220 12,07V
L8260 12,07V
L8240 12,07V
PPCPUVCC_S0_CPU 0V, no pulse
REG_PHASE_CPUVCC_3 0V, no pulse
REG_PHASE_CPUVCC_2 0V, no pulse
 

2informaticos

Administrator
Staff member
Don't waste time to measure coils from backlight circuit.
Try to put some logic on your work and save time.

Do you get pulse at PM_EN_REG_CPUVCC_S0?
Also check Power FETs output at page 75; not needed for Q8480.
 

iClub

Member
Sorry, I entered the wrong schematic, 820-3299 is the correct schematic.

PM_EN_REG_CPUCORE_S0 0V, pulses when the SMC_ONOFF is triggered
 

iClub

Member
UB510, UB530, UB550, UB650, and U9700 get warm by looking through the thermal camera.


Could it be GPU?
 

iClub

Member
U6921
1 - 3,3v
2 - 3,3v
3 - 0v, no pulse.
5 - 16,82mV
6 - 8,64mV
7 - 3,31V
8 - 3,31 V


L7410 3,47mV, no pulse.
L7510 1,26mV, no pulse.
 

2informaticos

Administrator
Staff member
L7410/510 voltage must appear before CPU core.
In fact L7510 and CPU core voltage cannot appear without L7410 voltage.
So check U7400 basic voltages: pins 13, 14, 3.
 
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