Sony KD-34XBR2 Training Manual page 34

STBY LED
IC001
MAIN MICRO
M306V2MF
54
AC RELAY
(D BD.)
Testing - If the Standby light blinks two or seven times, the problem is most likely on the D board where the
sensing and Horizontal Output stages are. On the D board, if the Horizontal Output (Q5030), PWM (Q5003/
Q5011) transistors and video output ICs (C board) are good, suspect the components in the sensing circuit (same
board). The sensing parts are Q5004, IC5007 and Q5018.
Verify that this circuit is causing the shutdown by disconnecting the H. Output Transistor Q5030 and monitor the
voltage at CN5505/pin 8 (D Bd) as you power ON. If this voltage rises above 1 volt, this +135V OCP circuit or
Q3111 is responsible. The 135V OCP circuit consists of:
R5013, Q5004, IC5007, delay cap C5006, and Q5018 on the D board (not all parts shown in Figure 8-10).
B BD.
CN002/
CN3022
R055 S DATA
31
B19
26 B20
S CLK
R069
B20
R024
CN001/
CN3020
FIGURE 8-10 - SHUTDOWN - 7X INDICATION
A BD.
IC3101
25
Y/C CRT DRIVE
26
CXA2150AQ
34
CN3103/
Q3111
CN5505
8
H.PROT.
Q5004
IC5007
Q5018
OCP
+135V
FROM
SEC
P.S
R5013
(D BD.)
D BD.
31
8. Protection Block (HA-3 Chassis)
200V TO
RGB VIDEO
OUTPUT (C BD.)
Q5016
200V
REG
200V
D5015
HOT T5001
Q5030, Q5011
135V
H. OUT
D5013
REG
102V
IC5002
PWM
CIRCUITRY
Q5003,
Q5011
18TVP12 1337
H
DY
9/4/01