Sony KS-50R200A Service Manual page 128

PFC converter fail
on G board
(PFC out<380V)
PFC out
No
C6008 (Block)
PFC out<10V?
Yes
Please check F6000
R6002/6009/
Q6500/6505
Main converter fail
on G board
No
R6102 Open?
Yes
Q6100,Q6101
Fail *1
*1 If Q6100 and Q6101 fail,
Must change D6104 and D6105
together
3V
Pin12
Shut Down
PFC converter trouble shooting
PFC out
No
200V<Vout<350V ?
Yes
Check IC6502
pulse waveform
R6530/R6531/
R6536/R6537/R6538/
Main converter trouble shooting
When turn on
No
IC6100 pin 15
IC6100 pin 3
more than 15V ?
saw waveform
appear?
Yes
When turn on
No
IC6100 pin 1
IC6100 pin 20
more than 1.4V ?
pulse waveform
appear?
Yes
No
IC6100 pin 12
PH6200,IC6200 fail.
more than 3V ?
Yes
IC6100 OCP operate
Circuit is short.
Secondary side
– 4-85 –
KS-50R200A/60R200A/70R200A
RM-GA006
No
Standby
IC6502 pin8
16 20V ?
Floating 18V fail
Yes
No
IC6502 pin7
appear?
Yes
Check IC6502
Check
D6504/D6509
Q6501/R6502
No
Stand by
Floating 18V fail
Yes
No
IC6100
Fail
Yes
IC6100 or
RM-GA006 RM-GA006