Read Sharp LC-19D1EBK (serv.man5) Service Manual online
LC-19D1E/S-BK/WH
4 – 17
<When EXT1 is used for external input> No picture on the display (4)-3
No EXT1-Y/C output of the external input system.
Checklist:
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
• • • Set it as “EXT1” 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 according to the operation manual of external device.
Is Y/C signal sent to pins (20) and (15) of SCART1 (SC501) ?
NO
Check external connection, input setting, SCART1 (SC501) and
peripheral circuits.
peripheral circuits.
YES
Is Y/C signal (Y1/C1) sent to pins (W1) and (N1) of IC801 (DVP-
M2)?
M2)?
NO
Check IC508(SW), IC507(SW), connector SC1203 (14)(16)pin,
connector P502 (14)(16)pin and peripheral circuits.
connector P502 (14)(16)pin and peripheral circuits.
YES
Is LVDS video signal (RA
± - RD±) output from pins (P22)(P23) -
(V22)(V23) of IC801 (DVP-M2), and is RCLK signal (RCLK
±)
output from pins (U22)(U23)?
NO
Check pins (R19)(D5) of B3.3V line of IC801 (DVP-M2), pins
(D12) of B1.5V line, pins (B6)(A6) of SDA1/SCL1 line and
peripheral circuits.
(D12) of B1.5V line, pins (B6)(A6) of SDA1/SCL1 line and
peripheral circuits.
YES
Is RSDS-R/G/B signal (R[0:2]
±, G[0:2]±, B[0:2]±) output from
pins (53) -(72) of IC9201 (RSDS-TRANSMITTER) , and is CLK
signal (CK
signal (CK
±) output to pins (60) and (59)?
NO
Check pins (1) and (9) of B3.3V line of IC9201 (RSDS-TRANS-
MITTER), short circuits and peripheral circuits.
MITTER), short circuits and peripheral circuits.
YES
Is RSDS-R/G/B signal (R[0:2]
±, G[0:2]±, B[0:2]±) and CLK signal
(CK
±) input to connector (SC9201) of LCD-PANEL?
(RSDS-R signal:22-27pin, RSDS-G signal:57-62pin, RSDS-B
signal:66-71pin, CK
signal:66-71pin, CK
± signal:33/32pin)
NO
Check whether there is short-circuit at CONNECTOR SC9201 of
LCD-PANEL and also check peripheral circuits.
LCD-PANEL and also check peripheral circuits.
YES
Is liquid crystal drive power supply input to CONNECTOR
SC9201 of LCD-PANEL?
(VLS_B14.6V=40/41/42pin, VGH_B32V=5/6pin,VGL_-6V=2/
3pin, COM-BIAS=75/76/77pin)
SC9201 of LCD-PANEL?
(VLS_B14.6V=40/41/42pin, VGH_B32V=5/6pin,VGL_-6V=2/
3pin, COM-BIAS=75/76/77pin)
NO
Please check REGULATOR-circuit of a defective voltage respec-
tively.
tively.
YES
Replace LCD-PANEL.
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