820-01598 DEAD

[tech]

BOARD DEAD
Q7040 SHORTED TO GROUND
I CHANGED WITH AON7934 (Q7040 WAS SiZ342DT) BOTH DUAL N CHANNEL
SHORT CLEARED.
NOW AM GETTING ONLY 1.3VOLT AT FUSE F7000.

WHAT MAY BE THE ISSUE
IS BAD CHARGING IC OR WRONG MOSFET ?
PLEASE HELP

 

[2informaticos]

Please, stop to write entire message in capital letters.
Is (scientifically demonstrated) more difficult to read, than normal writing.

Q7040 has more than 1 pin; which was shorted to ground (apart of 5-7)?
Is more convenient to specify a rail/line/pin, instead of a component; avoid missunderstood, please.

Do you now get 5V at R7020?
If yes, post basic U7000 voltages; P_IN, AUX_DET, VDDA/P, SMC_RST_IN, SMC_RST#, AUX_OK, A/BMON.
Also check diode mode to ground at PPBUS_G3H.

 

[tech]

First of all sorry.
No Q7040 no other legs shorted to ground
It's internally shorted.
The short cleared by replacing q7040

PPBUS_G3H has high resistance arround 1300,
it goes high ohm in diode mode

 

[tech]

U7000 voltages;
PP DCIN_G3H_CHGR = 5 VOLT
AUX_DET = 1.1VOLT
VDDA/P = 5VOLT
CHGR_RST_IN=0 VOLT
SMC_RST# NOT FOUND
AUX_OK NOT FOUND
A/BMON= 0VOLT
PP3V3_G3H_RTC = 0VOLT

 

[2informaticos]

"SMC_RST# NOT FOUND
AUX_OK NOT FOUND"
Sorry, forgot this T2 board makes different use of some U7000 signals.

Is still not clear which Q7040 lines did you find shorted to ground!
Just in case, test replacing Q7030 too.

 

[tech]

Q7040'S 5,6,7 legs are GND
and 2,3,4 are PPVBAT_G3H_CHGR_REG
its totally shorted so PPVBAT_G3H_CHGR_REG was shorted to ground before changing Q7040
after replacing Q7040 , F7000 gets high resistance to ground.
I changed both Q7040 and Q7030 with same (AON7934)
but still only 1volt at F7000.

 

[2informaticos]

If all R/C/7030/40 are good, change U7000.

 

[tech]

I ordered charging ic, but till not get
Waiting.