Sharp LC-32DH57E-BK Service Manual page 47

<When EXT3/4/8 is used for external input>
No PC output when the EXT4 external input is used.
Checklist:
1) Is "INPUT SOURCE" button
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 RGB signal sent to pins (1), (2) and (3) of EXT4 terminal
(PC_IN) (SC501)? (PC_R/G/B)
Is the RGB signal (PC_R/G/B) sent to input terminal pins (AE20)
(AE19) and (AD19) of IC3303 (VCT)?
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)?
Is the LCD12V input to (12)-(15) pin of LP Connector (P2604),
and is the I2C signal (VCOM_SDA/SCL) input to (13)/(12) pin?
Exchange LCD-CONT-UNIT and do it operate normally?
Check the contact of the LCD-CONT-UNIT connection harness
(CN3/4).
Exchange LCD-PANEL if it is useless even if it exchanges it.
No picture on the display (4)-2
on the remote control set up correctly? ••• set it as "EXT3"/"EXT4"/"EXT8" with the INPUT SOURCE button on
YES
YES
YES
YES
NO Check external connection, input setting, EXT4 terminal (PC_IN)
(SC501) and peripheral circuits.
NO Check between pins (1) (2) (3) of EXT4 terminal (PC_IN)
(SC501) and pins (AE20) (AE19) (AD19) of IC3303 (VCT).
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.
NO Check Q9606 (SW) for the LCD12V, and check IC2601 for the
I2C signal.
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LC-32DH57E-BK/RU-BK/S-BK