Read Sharp LC-19A1E (serv.man4) Service Manual online
LC-19A1E-BK/WH
4 – 14
<When EXT1 is used for external input> No picture on the display (3)-2
No EXT1-RGB 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 as per the operation manual for the device.
Is RGB signal sent to pins (15), (11) and (7) of SCART1
(SC501)?
NO
Check external connection, input setting, SCART1 (SC501) and
peripheral circuits.
peripheral circuits.
YES
Is RGB signal (SCART-R/G/B) sent to input terminal pins (N1)
(J1) and (K2) of IC801 (DVP-M2)?
(J1) and (K2) of IC801 (DVP-M2)?
NO
Check Connector SC1203 (16) (17) (18) pin, Connector P502
(16) (17) (18) pin and peripheral circuits.
(16) (17) (18) 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 to pins
(53)-(72) of IC9201 (RSDS-TRANSMITTER), and is CLK signal
(CK
(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 sig-
nal (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-B12V=40/41/42pin, VGH=5/6pin,VGL=2/3pin, COM-
BIAS=75/76/77pin)
SC9201 of LCD-PANEL?
(VLS-B12V=40/41/42pin, VGH=5/6pin,VGL=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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