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PPBUS_G3H missing on a1932

L

Leroy

Member
Hi, i'm new here and a beginner in repair. I've red other topics and tried to do some research already. But i'm stuck what to do next.

I got a1932 thats not turning on. no amps are pulled also. This is what i've found. no liquid damage or damaged components.

PPBUS_G3H measured. 0V

(P_IN ) PPDCIN_G3H - 5V
(AUX_DET) CHGR_AUX_DET - 1.2V
(SMC_RST_IN) CHGR_RST_IN - 0V
(VDDA) PPCHGR_VDDA - 5V
(VDDP) PPCHGR_VDDP -5V
(EN_MVR) CHGR_EN_MVR - 0V
(AUX_OK) - Could not locate this.
(AMON) CHGR_AMON - Under the shield - Couldnt check
(BMON) CHGR_BMON - 0V

on diode mode:
PPBUS_G3H checked at C6482.
Red to Ground 0
Black to Ground 0.


L7290 is 0.024
L7230/L7210/L7430/l7410 is 0.006
L8102 is .080 black on ground 0.048
L6960 0.00
 
2informaticos

2informaticos

Administrator
Staff member
First of all, welcome to the forum!

"on diode mode:
PPBUS_G3H checked at C6482.
Red to Ground 0
Black to Ground 0"
Do you mean shortcircuit (0.000)?
Because OL (open line) should get one way only.
 
L

Leroy

Member
Ik remeasured it first. Made a mistake there i think. L6960 on diode mode 0.464.
did some short traking on the coils.
L7290 short both sides
L7230 short both sides
L7210 short both sides
L7430 short both sides
l7410 short both sides
L8102 short both sides
L6960 short both sides
L7670 good
L7960 good
L8410 good
L8100 good
 
2informaticos

2informaticos

Administrator
Staff member
"L6960 on diode mode 0.464
------------
L6960 short both sides"
PLEASE, post accurate information!

Post actual readings instead of "short".
Many of mentioned coils have very low resistance to ground as normal; no short at all.

BTW, don't bother to check both pins of a coil to ground; do you really expect to get different readings???
 
L

Leroy

Member
I think I’m mixing up a few things. I put my meter on continuity mode, one probe on ground and the other to the L6960. It should not be beeping i thought.

On diode mode:
L7290 is 0.024
L7230/L7210/L7430/l7410 is 0.006
L8102 is .080 black on ground 0.048
L6960 0.464
 
2informaticos

2informaticos

Administrator
Staff member
I don't see any short.
Do NOT make confusion between beep and short; multimeters bepp until 0.050-0.080, depending of model.

Don't forget to check at L9060.

Still short (0.000) at PPBUS_G3H?
 
2informaticos

2informaticos

Administrator
Staff member
If no other coil gives same reading to ground, then is safe to use voltage injection method.
However, start with 1V; if pure short, should be enough to heat something.
Set PSU lab current limit to max first.
 
L

Leroy

Member
It's C6405. gets dry instantly.... tried to get it off, but it doesn't release. up to 410 degrees now. let the board cool off now first
 
L

Leroy

Member
No. Takes a few seconds to climb there.

With red on ground it’s 0.450. (yes my probes are correctly connected, I checked because I took them of for injection)
 
2informaticos

2informaticos

Administrator
Staff member
Remember to ALWAYS check that way.
Black probe to ground is rarely used, for special purpose.

Your mainboard may be now damaged by the overheating applied to remove C6405.

Now post PPBUS_G3H and 3V3_G3H voltages.
 
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