820-00928-A Stuck on 5V

Hello

820-00928-A
-Stuck on 5V
-Water damage around: UB400, UB300 and UB000
-PP3V3_G3H: 3.3V
-No short to ground on big coils.


Any idea? Thanks!
 
I am waiting the CD3215 chips to replace them but my customer wants me to replace the complete board.

How can I know whats the capacity of the SSD on these boards? What is SSD chip?
I was able to find a marking on the board saying the speed the CPU and VRAM but I cannot fin the specs for the SSD. Any help?
 
Hello.
I have replaced both CD3215 that had liquid damage but same issue.

The USB ICs that I replaced loop on 5V. The other USBC port (assumed ok) turn on and then off the USB C Metter.


Any idea?
 
DIODE READINGS

LDOs from U3100
PP3V3_UPC_XA_LDO: 0.493
PP1V8_UPC_XA_LDOA: 0.509
PP1V8_UPC_XA_LDOD: 0.472
PP1V1_UPC_XA_LDO_BMC: 0.500

LDOs from U3200
PP3V3_UPC_XB_LDO: 0.496V
PP1V8_UPC_XB_LDOA: 0.509V
PP1V8_UPC_XB_LDOD: 0.473
PP1V1_UPC_XB_LDO_BMC: 0.496

LDOs from UB300
PP3V3_UPC_TA_LDO: 0.506V
PP1V8_UPC_TA_LDOA: 0.510V
PP1V8_UPC_TA_LDOD: 0.475V
PP1V1_UPC_TA_LDO_BMC: 0.496V

LDOs from UB400
PP3V3_UPC_TB_LDO: 0.494
PP1V8_UPC_TB_LDOA: 0.510
PP1V8_UPC_TB_LDOD: 0.471
PP1V1_UPC_TB_LDO_BMC: 0.501
 

2informaticos

Administrator
Staff member
1.1V LDO_BMC must appear only on the connected port.

Consider to reflash UB090.
Check all its related resistors and traces.
 
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