Sony XBR-55X900H Service Manual page 23

2021/04/27 23:25:57 (GMT+09:00)
1.3 No Power DDCON/LDO
BM5S Board Model
Board Operation IC Ref
BM5S DC/DC IC4800
BM5S DC/DC IC4801
BM5S DC/DC IC4802
BM5S DC/DC IC4803
BM5S DC/DC IC4809
BM5S DC/DC IC4810
SAFETY NOTES
Checking item summary
Voltage supply Output ref.
1.8V_BE_DDC C4805/JL4801
1.1V_BE C4813/JL4803
0.9V_BE_DDC_1 C4820/JL4805
0.9V_BE_DDC_2 C4828/JL4807
0.8V_BE C4860/JL4819
0.7V_BE C4878/JL4821
SELF DIAGNOSTIC FUNCTION TROUBLESHOOTING
T R O U B L E S H O O T I N G
Enable pin Enable source
R4801(shorted)/CL4816 P_ON_#2
R4809(shorted)/CL4817 P_ON_#2
R4819(shorted)/CL4818 P_ON_#1
R4827(shorted)/CL4819 P_ON_#1
R4849(shorted)/CL4808 P_ON_#1
R4865(shorted)/CL4811 P_ON_#1
SERVICE ADJUSTMENT
Fuse Vcc ref.
F4800 C4803
F4801 C4812
F4802 C4819
F4803 C4827
F4804 C4845
F4805 C4863
P_ON_#1 : P-on u-com IC401 #pin12
P_ON_#2 : P-on u-com IC401 #pin13
DIAGRAM HANDLING GUIDE
23
SYS SET