Sharp LC-13SH3U User Manual

29
LC-13AV6U
TROUBLE SHOOTING TABLE
Check IC7701 and its
peripheral parts.
Is T7701 primary
switching waveform at
pin (1) of IC7701
normal?
Check all output voltage
line for short or open
circuit.
Are T7701 secondary
output at C7734, C7735
voltage normal?
Check the voltage at
C7006, C7008, C7010
and C7012 are normal.
Check the primary side
of T7001, IC7301 and
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
IC1004 in "H" state?
No video and audio output (No power) No fluorescent lamp light-up
Yes
Yes
No
No
No
No
No
No
No
No
Is Q7751 base voltage at
"L" state?
Replace F7701.
Accord specified.
Remove F7701 and
check the load side. Is
there any short-circuit in
T7701 primary side and
periphery?
Yes
Yes
Are the outputs of
Q3601 and Q3602 in the
"L" state?
Yes
Are the waveform of pins
(2) and (4) of T6701-
T6704 normal?
Yes
Is the waveform of pin
(10) of T6701-T6704
normal?
Yes
Check the error amp
circuit
D6705, D6707, D6710,
D6712, D6715, D6716,
Q6706, Q6713 and their
peripheral parts.
Yes
Yes
Check IC7701/T7701
and its peripheral
parts.
Check the OFL 1/2
line, IC1004 and its
peripheral parts.
Check the OFL line,
Q3601/Q3602 and its
peripheral parts.
Check Q6700-Q6702,
Q6707-Q6709 and its
peripheral parts.
Replace the backlight
lamp with new one
and check again.
Check Q6700-Q6702,
Q6707-Q6709 and its
peripheral parts.
Yes
Yes
No
No
No

Sharp LC-13SH3U Specifications

General

Brand	Sharp
Model	LC-13SH3U
Category	LCD TV
Language	English