Sony KD-43X85K Service Manual page 25

TROUBLESHOOTING
1.3 No Power DDCON/LDO (DDCON Check)
START
Check IC600 Vcc
no
voltage
C601
Is voltage >12V?
yes
Check Vcc voltage
no
C801/C628
Is voltage >4V?
yes
Check Enable
no
IC800 #pin1/
IC608 #pin4
Is voltage >2.5V?
yes
Change DDCON
IC801/IC802/
IC803/IC603
Check Vcc voltage
no
C801 / C628
Is voltage >3V?
yes
Check
no
D801/D601
Is diode okay?
yes
1.2 No Power u-Com Failure
or
Enable source
Check
no
D800/D600
Is diode okay?
yes
Change D801/D601
Check 5V_MAIN DDCON (IC600)
Please refer page 24 for Ref number.
Change D800/D600
Check 3.3V_STBY.
Power board
Board Operation IC Ref
DC/DC IC801
DC/DC IC802
BM5A
DC/DC IC803
DC/DC IC603
Voltage supply
1.1V_M5_DDR
0.9V_M5_STBY
1.8V_STBY
1.0V_TU_P
25
SYS SET