Sony XBR-55X900H Service Manual page 27

2020/06/27 06:31:32 (GMT+09:00)
1.3 No Power DDCON/LDO
BM5 and BM5S Board Model
START
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
SECTION 1
T R O U B L E S H O O T I N G
no
Check Vcc voltage
C801 / CL819
Is voltage >3V?
yes
no
Check
D801
Is diode alive?
yes
no
Change IC800
SECTION 2
S E C T I O N 3
DDCONs check
no
Check
D800
Is diode alive?
yes
no
Change D801
Check 5V_MAIN DDCON (IC600)
Board
BM5/BM5S
BM5/BM5S
BM5/BM5S
SECTION 3 SECTION 4
Please refer page 25 - 26 for Ref number.
no
Change D800
Check 3.3V_STBY.
G* board
Operation IC Ref Voltage supply
DC/DC IC801 1.1V_M5_DDR
DC/DC IC802 0.9V_M5_STBY
DC/DC IC803
SECTION 5 SECTION 6
1.8V_STBY
27
SYS SET