A1534 820-00244 5v 0a [SOLVED]

[nik1981]

Failed charge port - chewed up pins

Changed the port but nothing past 5v - tested port on known good board and the port is fine.

Checked CD3215B01 and LDO_BMC = 0v
Changed CD3215B01 and still the same... changed again in case it was faulty chip.. still the same.

Checked further and all LDO are present apart from LDO_BMC.
No shorts on CC1 CC2

SMC_RESET_L 0.5v and fluctuating
PP3V3_G3H = 0v
SMC_PM_G2_EN =0v
SMC_BC_ACOK =0v
PP3v3_S5 = 0v
PP3v3_S5_SMC_VDDA = 0v

R7020 DCIN 5.1v

ACIN on U7000 1.3v
DCIN on U7000 5.1v

Im stuck at this point.

 

[2informaticos]

Check PP3V3R3V0_AON.

 

[nik1981]

Thank you for the reply 2informaticos.

PP3V3R3V0_AON = 2.97v

 

[2informaticos]

Check diode mode at PPBUS_G3H and 3V3_G3H.

 

[nik1981]

PPBUS_G3H = 0.410
PP3V3_G3H = 0.333

same readings on the working board

 

[nik1981]

PP5v_S5 = 0.408 same as working board
PP5v_S4 = 0.152 quite low (0.315 on working board)

 

[2informaticos]

If you have good board, compare readings on all coils.

 

[nik1981]

The good board is slightly different but should hopefully be good enough for comparison

	Bad Board - 820-00244	Good Board - 820-00687
L7670	0.153v	0.313v
L7690	0.346v	0.345v
L7430	0.009v	0.014v
L7410	0.009v	0.014v
L7230	0.010v	0.015v
L7210	0.010v	0.015v
L7290	0.025v	0.025v
L8000	0.051v	0.048v
L8050	0.068v	0.061v
L7900	0.176v	0.111v
L8410	0.410v	0.402v
L7960	0.114v	0.113v
L9000	0.343v	0.360v
L7030	0.447v	0.455v

All small coils on the same side and opposite side gave similar readings to the good board

My only concern with these is L7670 which is PP5V_S4

 

[2informaticos]

Check at L7670 in reverse way too; black probe at ground.

 

[nik1981]

in reverse it climbs up to OL - same as good board

 

[2informaticos]

So the problem shouldn't be there.
Compare voltage and diode mode to ground at PP3V3R3V0_AON.

 

[nik1981]

PP3V3R3V0_AON 0.534v on both boards
2.974v bad board - 3.281v good board

 

[2informaticos]

Try changing U7000.

 

[nik1981]

Unfortunately I don't have a scrap a1534 board but I've been playing around and the board powers up on battery. Lights up gets PPBUS_G3H HS_Computing etc.
If I plug in the charger while the board is powered by battery, the power meter stays blank as if no power is going through it.

Does that help narrow down any other possibilities?

 

[2informaticos]

Then you have problems around CD3215 chip.

 

[nik1981]

Thank you for your help 2informaticos. I waited for a new batch of CD3215B01 and it now works perfectly.. must have been two bad CD3215 in a row.