Read Sharp LC-19A1E (serv.man4) Service Manual online
LC-19A1E-BK/WH
4 – 18
<When EXT3 is used for external input> No picture on the display (5)
No EXT3 Component output of the external input system.
Checklist:
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
• • • Set it as “EXT3” 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 Component video signal (COMP-Y, Pb, Pr) sent to EXT-3-
TERMINAL (J501)?
NO
Check external connection, input setting, EXT-3-TERMINAL
(J501) and peripheral circuits.
(J501) and peripheral circuits.
YES
Is Component video signal (COMP-Y, Pb, Pr) sent to input termi-
nal pin (J2) (L1) (R1) of IC801 (DVP-M2)?
nal pin (J2) (L1) (R1) of IC801 (DVP-M2)?
NO
Check EXT-3-TERMINAL (J501), Connector SC1202 (20) (21)
(22) pin, Connector P501 (20) (21) (22) pin and peripheral cir-
cuits.
(22) pin, Connector P501 (20) (21) (22) pin and peripheral cir-
cuits.
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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