Sony XBR-55X900H Service Manual page 26

2021/04/27 23:25:57 (GMT+09:00)
1.3 No Power DDCON/LDO
BM5 and BM5S Board Model
START
yes
Check Vcc voltage
C4xx/C8xx
Is voltage >3V?
yes
Check Enable pin
voltage
Is voltage >3V?
yes
Change LDO IC
SAFETY NOTES
LDO check
Check 3.3V_MAIN
DDCON
no
(IC601 on BM5 / BM5S)
or
3.3V_STBY (G* board)
no
1.2 No Power U-Com Failure
or
Enable source
SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING
T R O U B L E S H O O T I N G
SERVICE ADJUSTMENT
Please refer page 22 - 23 for Ref number.
Board Operation IC Ref
BM5/BM5S LDO IC403
BM5/BM5S LDO IC806
BM5/BM5S LDO IC809
DIAGRAM
Voltage supply
3.3V_MAIN_H
1.8V_M5_ET_STBY
3.3V_M5_STBY
26
HANDLING GUIDE
SYS SET