Read Sharp LC-32LE600E (serv.man7) Service Manual online
LC-32/40/46LE600E/RU/S
5 – 22
<When EXT3/4/8 is used for external input> No picture on the display (4)-3
No Composite video output when the EXT8 external input is
used.
Checklist:
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
••• set it as “EXT3”/”EXT4”/”EXT8” with the INPUT SOURCE button on
the remote control.
2) Is MENU-Picture-Backlight/Contrast/Brightness set to “MIN”?
••• Set it to an appropriate level.
3) Check the connection to the external device
••• Connect it correctly as per the operation manual for the device.
4) Attention: The terminal of IC3303 (VCT) cannot be actually checked by hiding oneself, and check it with another terminal of the same line,
please.
Is the Composite video signal sent to pin (6) of EXT8 terminal
(J505)? (CVBS_IN)
NO
Check external connection, input setting, EXT8 terminal (J505)
and peripheral circuits.
and peripheral circuits.
YES
Is the Composite video signal (CVBS_IN) sent to input terminal
pin (AC24) of IC3303 (VCT)?
pin (AC24) of IC3303 (VCT)?
NO
Check between pin (6) of EXT8 terminal (J505) and pin (AC24)
of IC3303 (VCT) and peripheral circuits.
of IC3303 (VCT) and peripheral circuits.
YES
Is the LVDS video signal (LVDS0_D [0:4]
±) input to pins (40)-
(28) of LW Connector (P2601), and is CLK signal (TCLK
±) input
to pins (32)/(33)?
NO
Check whether there is short circuit between [A6:A11], [B6:B11]
pin of IC3303 (VCT) and (40)-(28) pin of LW Connector (P2601),
and peripheral circuits.
pin of IC3303 (VCT) and (40)-(28) pin of LW Connector (P2601),
and peripheral circuits.
YES
Is the I2C signal (VCOM_SDA/SCL) send to pin(12)/(13) of LP
Connector (P2602)?
Connector (P2602)?
NO
Check the I2C signal of IC2602 and peripheral circuit.
YES
Is the PNL12V output to pin (1)/(2) of PL Connector (CN7004(32
inch)/CN7503(40/46 inch)) of POWER UNIT?
inch)/CN7503(40/46 inch)) of POWER UNIT?
NO
Check PL connector of POWER UNIT and U7053(32inch)/
IC7502(40/46inch).
IC7502(40/46inch).
YES
Exchange LCD-CONT-UNIT and do it operate normally?
NO
Check the contact of the LCD-CONT-UNIT connection harness
(LW/LP/PL).
Exchange LCD-PANEL if it is useless even if it exchanges it.
(LW/LP/PL).
Exchange LCD-PANEL if it is useless even if it exchanges it.
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