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Trouble for Sub Pinture (PIP).
See related trouble shooting, and convert to equivalent parts as followings.
TU201
TU101
IC201
IC101
L200
L105
Q201
Q101 etc.
Circuits to be checked:
NO VERTICAL SCAN
• IC1501, 1502 and its
peripheral circuit
Check the voltage at pin (6) of IC1501 and
Normal
pin (3) of IC1502.
Check vertical trigger pulse at pin (31) of IC801.
Normal
Abnormal
Check IC1501, IC1502
Check IC801 and its
and related circuits
peripheral parts.
Note1: Make sure that not for the horizontal centering mode.
Turn on the service mode. (Short TP1001 and TP1002.)
Then when you press "- / --" key on the remote you
can get in the horizontal centering mode.
Note2: The vertical sync signal must be fed to pin (62) of
IC1001 in oder not to activate the vertical no-scan
protector.
Take this measure with the protector circuit for the
troubleshooting on the following pages.
Circuits to be checked:
• Power circuit.
• Video circuit.
• Protector cirucit.
• Peripheral circuit of
Bus Line.
Check CRT connector (KY), (H).
Abnormal
Normal
Check L1501, D1605, D1506
and R1650.
Check Q850,
Q851, Q852,
Q853, Q854,
Q855.
D1201 (POWER LED) turns on and
off.
Clear the bus error by + 2.5V voltage
pin (16) of IC1001 first and then
turning on the power. (D1201 is then
supposed to stop flashing).
Does D1201 turn in red?
Check
protector.
NO RASTER
Yes
Does RY1701 turn on?
Turns on, but soon turns off.
Abnormal
Does D1201 (POWER LED) turn on?
Check IC801.
Yes
(Bus error)
Check
protector circuit
and its related
parts (62) of
IC1001 V
Yes
No
PULSE.
Put pin (16) of
IC1001 in the
original state
and see many
B
often D1201
flashes in red.
This indicates
which IC to
check up.
No
A
Yes (RED)
No
Check the
power circuit
consisting of
IC1701, IC1702,
IC1703, D1701
etc.
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