Sony XBR-55X850D Service Manual page 27
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Also See for XBR-55X850D:
- Service manual (197 pages) ,
- Instruction manual (114 pages) ,
- Reference manual (56 pages)
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1-3. NO POWER DDCON/LDO
Case: BMFW2 structure
DDCONs check
START
Check fuse
no
F9xxx
Is fuse OK?
yes
no
Check Vcc voltage
C9xxx
Is voltage >12.0V?
yes
Check Enable pin
no
voltage
Is voltage >2.5V?
yes
Change DDCON IC
Refer this list
XBR-55X850D/857D, 65X850D/855D/857D, 75X850D
Change Fuse
Check POWER_ON
IC9017 #pin19
(Refer 1-2 No Power U-Com Failure)
1-2 No Power U-Com Failure
or
Enable source
Case: BM1 + DPS structure
DDCONs check
START
Check fuse
F9xxx / F4xx
Is fuse OK?
yes
Check Vcc voltage
C9xxx / C4xx
Is voltage >12.0V?
yes
Check Enable pin
voltage
Is voltage >2.5V?
yes
Change DDCON IC
Refer this list
TROUBLE SHOOTING
no
Change Fuse
no
Check POWER_ON
IC9017 #pin19
(Refer 1-2 No Power U-Com Failure)
no
1-2 No Power U-Com Failure
or
Enable source
27
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