Sony GN3TR - No Power Ddcon;Ldo

XBR-49/55/65/75X900E
TROUBLE SHOOTING
FLOW
1-3. NO POWER DDCON/LDO
DDCONs CHECK ON JK*
23
Check Enable pin
voltage
Is voltage >2.5V?
No Power U-Com Failure
Change Fuse
no
no
START
yes
Change DDCON IC
Check fuse
F9001
Is fuse OK?
Check Vcc voltage
C9023
Is voltage >18V?
no
yes
yes
AC Adaptor
Check
F9000
On JK* board
OK
(Both side are
19.5V or 24V.)
NG
(Both side are No power.)
NG
(Only single side is
19.5V or 24V.)
Q9002 or
drive circuit around Q9002
on JK* board
F9000
IC Ref Voltage supply
IC9000 +12V_MAIN