Sony XBR-55X900H Service Manual page 24

2021/04/27 23:25:57 (GMT+09:00)
1.3 No Power DDCON/LDO
BM5 and BM5S Board Model
START
no
Check IC600 Vcc voltage
C601 Is voltage >12V?
yes
Check Vcc voltage
C801 / CL819
Is voltage >4V?
yes
Check Enable
IC800 #pin1 / R803
Is voltage >2.5V?
yes
Change DDCON
IC801 or IC802 or IC803
SAFETY NOTES
DDCONs check
Check Vcc voltage no
C801 / CL819
Is voltage >3V?
yes
no
no
Check
D801
Is diode alive?
yes
no
Change IC800
SELF DIAGNOSTIC FUNCTION
T R O U B L E S H O O T I N G
no
Check
D800
Is diode alive?
yes
Change D801
Check 5V_MAIN DDCON (IC600)
TROUBLESHOOTING SERVICE ADJUSTMENT
Change D800
Check 3.3V_STBY.
G* board
Please refer page 22 - 23 for Ref number.
Board Operation IC Ref
BM5/BM5S DC/DC IC801
BM5/BM5S DC/DC IC802
BM5/BM5S DC/DC IC803
DIAGRAM
Voltage supply
1.1V_M5_DDR
0.9V_M5_STBY
1.8V_STBY
24
HANDLING GUIDE
SYS SET