27
LC-15AV6U
Check all output voltage
line for short or open
circuit.
Is T7702 secondary
output at C7734, C7735
voltage normal?
Check the voltage at
C734, C735, C754 and
C750 are normal.
Check the primary side
of IC7001, IC702, IC706
and IC705 their
peripheral circuit.
Is F7701 specified?
And be function?
Disconnect F6700 or
F6702 Is the load
short-circuited?
Are F6700 and F6702
as specified?
Are there DC 18V input
at F6700 and F6702?
Is the pin (187) of
IC801 in "H" state?
No video and audio output (No po
wer)
No fluorescent lamp light-up
Yes
Yes
No
No
No
No
No
No
No
No
Is Q7751 base v
oltage at
"L" state?
Replace F7701.
Accord specified.
Remove F7701 and
check the load side. Is
there any short-circuit in
T7702 primary side and
periphery?
Yes
Yes
Are the outputs of
Q5001 in the "L" state?
Yes
Are the waveform of pins
(2) and (4) of T6700-
T6704 normal?
Yes
Is the waveform of pin
(10) of T6700-T6704
normal?
Yes
Check the error amp
circuit
D6700, D6701, D6702,
D6703, D6704, D6705,
Yes
Check IC7701/T7702
and its peripheral
parts.
Check the OFL 1/2
line, IC801 and its
peripheral parts.
Check the OFL line,
Q5001 and its
peripheral parts.
Check Q6700-Q6702,
Q6702-Q6709 and its
peripheral parts.
Replace the backlight
lamp with new one
and check again.
Check Q6700-Q6702,
Q6702-Q6709 and its
peripheral parts.
Yes
Yes
Check IC7701 and its
peripheral parts.
No
No
D6707, D6708, D6709,
D6710, D6711 and their
peripheral parts.
TROUBLESHOOTING TABLE
No TV Color
Check the output of IC801 and its
peripheral circuits.
Make sure the microprocessor's adjustment process menu settings are as specified.
No Video Color No S Video Color No Component Color
No Color
Check the line between pin (8) of
SC5202 and pin (31) of IC801.
Check the line between pin (3), (4) of
SC5202 and pin (21), (33) of IC801.
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