A1706 PP3v3_G3h Shorted.

[Instafixx]

PP3v3_G3H didoe mode to ground is 0.003.

Should we inject voltage ?

 

[2informaticos]

That's the fastest way...

 

[Instafixx]

CB300 was getting hot. Replaced it. Now PP3V3_G3H is 3.3V.
But board is still stuck at 5V with very little current draw.
No PPBUS Voltage.
PPBUS diode value are okay.

 

[2informaticos]

What is board code?

Remove F7000 and check C7050 voltage.

 

[Instafixx]

820-00239.

Removed Fuse. C7050 is 0.5v

 

[2informaticos]

So the problem is on U7000 area.
Checked diode mode there?

Post U7000's basic voltages: P_IN, AUX_DET, SMC_RST_IN, VDDA/P, EN_VR1, SMC_RST*, AUX_OK, A/BMON.

 

[Instafixx]

Didoe Mode Readings around U7000 ok. No Shorts.

Voltages
PPDCIN_G3H is 3.3V
TBA_AUX_DET 1.3V
SMC_4FINGER_RST 0V // DIODE .636
TBA_VDDA 5V
TBA_VDDP 5V
PM_EN_3V3_G3H 5V
SMC_RST_L 3.3V
SMC_AUX_OK 3.4V
CHGR_AMON 0V \\ DIODE 0.641
CHGR_BMON 0V \\ DIODE 0.641

 

[2informaticos]

"PPDCIN_G3H is 3.3V"
Check this again; isn't 5V instead?

I was expecting giode mode at C7050...

 

[Instafixx]

Apologies. Its 5v.
C7050 Diode is 0.573

 

[2informaticos]

Check Q7030/40 and associated components between them and U7000.

 

[Instafixx]

ALl rails of Q7030/40 and components surrounding have good diode mode readings.
Should we replace U7000?

 

[2informaticos]

Is next to try...

 

[Instafixx]

Replaced. Still the same.

 

[2informaticos]

Check/reaplace Q7030/40.

 

[Instafixx]

Replaced. Still the same.
Since CB300 was shorted and it is very close to CD3215 can it be a CD3215 issue?
What should we check to confirm ?

 

[2informaticos]

If R7020 gets 5V, U7000 should generate 12.3V at C7050; once F7000 is removed.

 

[Instafixx]

R7020 5V on all 4 Pads

 

[2informaticos]

Change L7030, just in case.

 

[Instafixx]

done. Same. No Voltage at L7030.

What can be the issue ?

 

[Instafixx]

My colleague didnt install CB300 properly. Works Now