Sharp LC-19D1EWH (serv.man5) Service Manual ▷ View online
LC-19D1E/S-BK/WH
4 – 13
<On input of the tuner (U/V)> No picture on the display (2)
No picture appears on LCD during the tuner (U/V) reception.
Checklist:
1) Is “INPUT SOURCE” button
on the remote control set up correctly?
• • • Set it as “TV” 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) Is ANT-CABLE disconnected or connected improperly?
• • • Connect it correctly as per the operation manual.
YES
Is the video signal (IF) output from pin (6) of Tuner (TU201 )?
NO
Check the Tuner (TU201) and peripheral circuits.
YES
Is the video signal (CVBS) output from pin (35) of lC501 (AV-
SW)?
SW)?
NO
Check pin(38) of the B9V power line , pins(28) and (29) of I2C-
line, and peripheral circuits.
line, and peripheral circuits.
YES
Is the video signal CVBS input to pin (U2) of lC801 (DVP-M2)?
NO
Check pin (35) of IC501 (AV-SW), pin (18) of Connector SC1202,
pin (18) of Connector P501 and peripheral circuits.
pin (18) of Connector P501 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 from 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)
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.
LC-19D1E/S-BK/WH
4 – 14
<During external connection> No picture on the external monitor (3)
SCART1:
NNo picture appears on EXT1 -connected monitor during the
DTV or tuner (U/V) reception.
Checklist:
1) Are input terminal on back of TV and “INPUT SOURCE” button
on the remote control set up correctly?
• • • See the operation manual and
set “INPUT SOURCE” appropriately.
2) Is SCART-CABLE disconnected or connected improperly?
• • • Connect it correctly according to the operation manual.
3) When the monitor picture is not sent and is not displayed on the monitor, refer to “No picture” for each terminal.
Is video signal output to pin (19) of SCART1 (SC501)?
YES
Check SCART1 , external connection or input setting.
NO
Is video signal (SCART-V-OUT) output from pin (22) of IC501
(AV-SW)?
(AV-SW)?
YES
Check pin (19) of SCART1 (SC501) and peripheral circuits.
NO
Is IF video signal (VIDEO_OUT) output from pin (6) of Tuner
(TU201)?
(TU201)?
YES
Check pin (41) of IC501 (AV-SW) and peripheral circuits.
NO
Check the B5V/5V(CONT)/IF5V power supply input pins (11)/(1)/
(3) of Tuner (TU201), pins (9)(8) of I2C line, and soldering.
(3) of Tuner (TU201), pins (9)(8) of I2C line, and soldering.
LC-19D1E/S-BK/WH
4 – 15
<When EXT1 is used for external input> No picture on the display (4)-1
No EXT1-Composite 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 composite video signal sent to pin (20) of SCART1(SC501)?
NO
Check external connection, input setting, SCART1(SC501) and
peripheral circuits.
peripheral circuits.
YES
Is composite video signal (SCART-CVBS) sent to pin (W1) of
IC801(DVP-M2) ?
IC801(DVP-M2) ?
NO
Check IC508(SW), connector SC1203 (14) pin, connector P502
(14)pin and peripheral circuits.
(14)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.
LC-19D1E/S-BK/WH
4 – 16
<When EXT1 is used for external input> No picture on the display (4)-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 according to the operation manual of external 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 pins (N1)(J1) and (K2) of
IC801(DVP-M2) ?
IC801(DVP-M2) ?
NO
Check IC507(SW), connector SC1203 (16)(17)(18) pin, connec-
tor P502 (16)(17)(18) pin and peripheral circuits.
tor P502 (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 from 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 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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