Sony KD-55X8 G Series Service Manual page 31

1.3 No Power DDCON/LDO
BSL Board Model
START
Check IC402 Vin voltage
C423
Is voltage >12V?
yes
Check Vin voltage
C417/C603
Is voltage >4V?
yes
Check Enable
IC600 #pin1
Is voltage >2.5V?
yes
Change DDCON
IC601
DDCON check
no
Check Vin voltage
C417/C603
Is voltage >3V?
yes
no
Check
D401/D601
Is diode alive?
yes
no
Change IC600
no
Check
D400/D600
Is diode alive?
yes
no
Change D401/D601
Check 5V_MAIN DDCON (IC402)
IC Ref Voltage supply
IC601 1.2V_M3_DDR
IC408 1.8V_TU_P
no
Change D400/D600
Check 3.3V_STBY.
G* board
(Supplementary
information)
31