Zenith XBV243 series Service Manual - Electrical
VR168 - 923-03485
3-1
D35E COMBO - ELECTRICAL
ELECTRICAL
TROUBLESHOOTING
SECTION 3 Electrical
NO
NO
NO
NO
N
O
N
O
N
O
YES
YES
YES
YES
YES
YES
YES
YES
N
O
NO
NO
YES
YES
YES
NO
NO
NO
YES
YES
YES
YES
(3) No 5.2V (SYS/Hi-Fi/TUNER)
NO 5.3VA.
Is F101 normal?
Is R101
normal?
Is Bd101
normal?
Is Vcc (8.5~21V)
supplied to IC101 Pin7?
Is the D112 normal?
Is there about 2.5V
at the IC102 Vref?
Is D110 normal?
Check the Main PCB
5.3VA/5.0V Line short?
Replace F101.
Replace
BD101.
Replace R101.
Is D102
normal?
Check or Replace
D102.
Replace D112.
Replace IC102.
Replace the D110.
NO 12VA.
Check or Replace
D110.
Is the Vcc (13V) supplied to (+)
terminal in D115 and D117?
Check or Replace
the Motor Vcc.
Is the Vcc (12V) supplied to (-)
terminal in D115 and D117?
Replace D115,
NO 5.2VA.
5.3VA Line Check.
Is 5.3VA put into
Q116 Emitter?
Is about 5V put into
Q116 Base?
Is Q115 Base
“H”?
Check the Power
Control.
Check or Replace Q115,
R160, R161, R162, D122.
Check or Replace
Q115/Q116
1. Power(SMPS) CIRCUIT
(1) No 5.3VA (SYS/Hi-Fi/TUNER)
(2) No 12VA (TO CAP, DRUM MOTOR)