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A1466 820-00165-A PM_SLP_S4_L missing

H

hjpl

Member
Hi,
A1466 820-00165-A with no power.
It has green and orange light, but it only puls 0.78A.

PPBUS_G3H = 8.59V
PP3v42_G3H = 3.40V
PP3V3_S5 = 3.3V
PP3V3_SUS =3.3V
PM_SLP_S3_L = 0V
ALL_SYS_PWRGD = 0V and no pulse.
PP5V_S4RS3 = 0V
PP5V_S0 = 0V and 0.450 on diode reading
PP3V3_S0 = 0.055V and 0.377 on diode reading
Triggering SMC_ONOFF_L I get a drop pulse at PM_PWRBTN_L and at PM_SLP_S4_L

PM_BATLOW_L = 3.33V
SMC_ADAPTER_EN = 3.40V
PM_DSW_PWRGD = 3.40V
PCH_DSWVRMEN = 3.2V

PCH RTC Signals:
PCH_INTRUDER_L = 3V
PCH_INTVRMEN = 3.22V
PCH_SRTCRST_L = 3.33V
RTC_RESET_L = 3.32V

Please help
 
2informaticos

2informaticos

Administrator
Staff member
So you detect pulse at PM_SLP_S4_L, triggering power button?
You should catch the pulse at PM_SLP_S3_L too.

Check these signals in SMC bypass mode.
 
H

hjpl

Member
Yes.
PM_SLP_S3_L also receives a drop pulse, checked in smc bypass mode
 
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H

hjpl

Member
No, I made a mistake in writing. After the impulse they return to 0v
 
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H

hjpl

Member
In SMC bypass mode the fan starts and stops 2 times and both signals reach about 3 volts and then immediately drop to 0V.
 
H

hjpl

Member
L7320, L7310, L7630, L7430, L7520 receive a pulse
L7560 3.33v Stable

U1950
pin3 and pin 7 pulse
 
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H

hjpl

Member
After warming up the PC with good flux the fan starts but I have a black screen and no sound.
All the big coils have the right voltage.
Bios faulty or something else to check?
 
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