Sony KD-34XBR2 Training Manual page 28

When D8014' s voltage reaches a critical level, IC8001 outputs a HIGH for as long as the TV is powered ON. The
HIGH passes through D8027 to trigger the Q6530/Q6532 latch that finally shuts off the TV set.
4. Surge Relay - If the secondary power supply (IC6501) came on but shut down in six seconds, it would seem as
though the TV' s AC relay had shut off the TV except that the AC relay remains energized.
This unlikely problem could happen if the primary power supply (IC6001 – A board) did not produce the 7Vdc
output used to energize the surge relay RY6502 or its contacts did not short out R6516. If the surge relay did not
energize after the TV was turned ON, C6595 would continue to charge. When this voltage reaches 0.6Vdc, latch
Q6526 and Q6529 would turn ON. This grounds the V sense voltage input to IC6501/pin 1, shutting down the
secondary power supply.
5. Shutdown Latch – Finally, an unstable standby voltage or a defect in the basic latch circuit (Q6530 and Q6532)
will also cause the TV to shut down without the standby light blinking. This last problem is rare.
RELAY
Q6501
AC
FROM
F BD.
Q6527
RELAY
DRIVER
D BD.
Testing – If the TV relays turn ON but quickly turn back off with no standby light indication, use these flow charts
to determine which one of the five circuits is causing the shutdown:
D6530
AC
R6516
SURGE
RELAY
R6527
RY6502,
PH503
AC RELAY
FROM IC001-
MAIN MICRO (A
LATCH
BD.)
Q6530,
Q6532
FIGURE 8-3 - SHUTDOWN - NO INDICATION
PRIMARY P.S (A BD.)
R6526
R6513-14
R6646
UNREG 7V
FROM PRIM
V SENSE
P.S (A BD.)
LATCH
Q6526, Q6529,
C6595
Q6528,
+
100
Q6503
25
8. Protection Block (HA-3 Chassis)
IC6501
R8043
SEC P.S
Q6506-7
T6501
Q8009
OCP
D8003
D8027
D8014
IC8001
PROT.
LATCH
15TVP12 1333
200V
TO H.V.
CONV.
FROM
FBT
T8001
EXCESS
HV (FBT
VOLT.)
ABL (FBT
CURRENT)
9/4/01