(347) 552-2258 [email protected]

A1706 820-00239-A no power

H

hgoncalves

Active member
Hi,

I have an A1706 820-00239-A with no power.

It looks that it had a small liquid contact on the left USB-C ports.

It puls 5.12V and 0.33A on all USB-C ports, but on UB300 port it only puls 0.16A.

UB300 seamed to be a bit burnt, and so I've replaced it but with the same result.

USBC_TA_CC1/2 seams to be ok, and have 0.564 on diode reading.

PP3V3_G3H has 1.898V and 0.398 on diaode reading

Can you help?
 
H

hgoncalves

Active member
Hi,

I suppose that there is something wrong with PP3V3_UPC_TA_LDO, but it looks that that's not all. Nothing else seams to be shorted, but not sure why there are other 0V voltages, and the bad readings on U3100. I guess that I might have damaged U3100 when replacing UB300...

UB300:
PP3V3_UPC_TA_LDO = 0.184V and 0.002 on diode reading and 1.1 ohm resistance to ground
PP1V8_UPC_TA_LDOA = 0V and 0.493 on diode reading
PP1V8_UPC_TA_LDOD = 0V and 0.458 on diode reading
PP1V1_UPC_TA_LDO_BMC = 0V and 0.482 on diode reading

UB400 (only has voltage with on side of charger):
PP3V3_UPC_TB_LDO = 3.285V and 0.508 on diode reading
PP1V8_UPC_TB_LDOA = 1.802V and 0.524 on diode reading
PP1V8_UPC_TB_LDOD =1.786V and 0.483 on diode reading
PP1V1_UPC_TB_LDO_BMC = 0V and 0.502 on diode reading

U3100:
PP3V3_UPC_XA_LDO = 2V and 0.512 on diode reading
PP1V8_UPC_XA_LDOA = 1.803V and 0.526 on diode reading
PP1V8_UPC_XA_LDOD = 1.8V and 0.489 on diode reading
PP1V1_UPC_XA_LDO_BMC = 0V and 0.520 on diode reading

U3200:
PP3V3_UPC_XB_LDO = 3.342V and 0.512 on diode reading
PP1V8_UPC_XB_LDOA = 1.805V and 0.527 on diode reading
PP1V8_UPC_XB_LDOD = 1.797V and 0.486 on diode reading
PP1V1_UPC_XB_LDO_BMC = 0V and 0.518 on diode reading
 
Last edited:
H

hgoncalves

Active member
Hi,

CB308 was shorted. After removed it, now it puls 20.5V but 0A, and on UB400 port it has a black ampmeter

PP3V3_UPC_XA_LDO also has 3.3V now.

Should I replace UB400?
 
Last edited:
You must log in or register to reply here.
Top