DOWNLOAD Sharp LC-19A1E (serv.man4) Service Manual ↓ Size: 998.69 KB | Pages: 22 in PDF or view online for FREE

Model
LC-19A1E (serv.man4)
Pages
22
Size
998.69 KB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD / Troubleshooting Table
File
lc-19a1e-sm4.pdf
Date
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LC-19A1E-BK/WH
4 – 13
<When EXT1 is used for external input>                           No picture on the display (3)-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 as per the operation manual for the device.
                                            
Is composite video signal sent to pin (20) of SCART1 (SC501)?
NO
Check external connection, input setting, SCART1 (SC501) and 
peripheral circuits.
YES
Is composite video signal (SCART-CVBS) sent to input terminal 
pin (W1) of IC801 (DVP-M2)? 
NO
Check Connector SC1203 (14) pin, Connector P502 (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.
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
±) 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.
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: 33/32pin) 
NO
Check whether there is short-circuit at CONNECTOR SC9201 of 
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)
NO
Please check REGULATOR-circuit of a defective voltage respec-
tively.
YES
Replace LCD-PANEL.
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.
YES
Is RGB signal (SCART-R/G/B) sent to input terminal pins (N1) 
(J1) and (K2) of IC801 (DVP-M2)? 
NO
Check Connector SC1203 (16) (17) (18) pin, Connector 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.
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
±) 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.
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: 33/32pin) 
NO
Check whether there is short-circuit at CONNECTOR SC9201 of 
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)
NO
Please check REGULATOR-circuit of a defective voltage respec-
tively.
YES
Replace LCD-PANEL.
LC-19A1E-BK/WH
4 – 15
<When EXT1 is used for external input>                           No picture on the display (3)-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 as per the operation manual for the 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.
YES
Is Y/C signal (Y1/C1) sent to input terminal pins (W1) and (N1) of 
IC801 (DVP-M2)? 
NO
Check Connector SC1203 (14) (16)pin, 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.
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
±) 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.
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: 33/32pin) 
NO
Check whether there is short-circuit at CONNECTOR SC9201 of 
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)
NO
Please check REGULATOR-circuit of a defective voltage respec-
tively.
YES
Replace LCD-PANEL.
LC-19A1E-BK/WH
4 – 16
<When EXT2 is used for external input>                           No picture on the display (4)-1
                                            
No EXT2-Composite output of the external input system.
                                            
Checklist:
1) Is “INPUT SOURCE” button 
 on the remote control set up correctly? 
• • • Set it as “EXT2” 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 composite video signal sent to pin (8) of EXT2-TERMINAL
(J503)?
NO
Check external connection, input setting, EXT2-TERMINAL 
(J503) and peripheral circuits.
YES
Is composite video signal (V1-V) sent to input terminal pin
(1) of IC501 (AV-SW)? 
NO
Check EXT2-TERMINAL (J503) and peripheral circuits.
YES
Is composite video signal (CVBS) sent to input terminal pin (U2) 
of IC801 (DVP-M2)? 
NO
Check IC501 (AV-SW), Connector SC1202 (18) pin, Connector 
P501 (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.
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
±) 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.
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: 33/32pin) 
NO
Check whether there is short-circuit at CONNECTOR SC9201 of 
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)
NO
Please check REGULATOR-circuit of a defective voltage respec-
tively.
YES
Replace LCD-PANEL.
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