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 – 17
<When EXT2 is used for external input>                           No picture on the display (4)-2
                                            
No EXT2-Y/C 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 Y/C signal sent to pins (3) and (4) of S-TERMINAL (J503)?
NO
Check external connection, input setting, S-TERMINAL (J503) 
and peripheral circuits
YES
Is Y/C signal (V1-SY/V1-SC) sent to Input terminal pin (3) and (5) 
of IC501 (AV-SW)? 
NO
Check S-TERMINAL (J503) and peripheral circuits.
YES
Is Y/C signal (Y/SC) sent to input terminal pins (P1) and (K1) of 
IC801 (DVP-M2)? 
NO
Check IC501 (AV-SW), Connector SC1202 (15) (14) pin, Con-
nector P501 (15) (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 – 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.
YES
Is Component video signal (COMP-Y, Pb, Pr) sent to input termi-
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.
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 – 19
<When EXT4 is used for external input>                           No picture on the display (6)
                                            
No EXT4 (HDMI) output of the external input system.
                                            
Checklist:
1) Is “INPUT SOURCE” button 
 on the remote control set up correctly? 
• • • Set it as “EXT4” with the INPUT SOURCE button on the remote 
control.
2) Is HDMI-Connector disconnected or connected improperly? 
• • • Connect it correctly as per the operation manual.
YES
Is “EXT4” selected with 
 button on the remote control?
NO
Select “EXT4” with 
 button on the remote control.
YES
Is TMDS signal (X*
± signal) sent to pins (1)-(12) of EXT4 (HDMI) 
terminal (SC402)?
NO
Is I2C signal (SDA/SCL signal) sent to pins (16) and (15) of 
EXT4 (HDMI) terminal? Check external connection and periph-
eral circuits.
YES
Is 8bit-DIGITAL signal (HDMI- R/G/B) sent from pins (71)-(111) of 
IC8702 (HDMI-RECEIVER)?
NO
Check power supply (B3.3/2.5V) pins (4) (67)/(95) (103) of 
IC8702, SDA/SCL signal pins (66) and (65), and peripheral cir-
cuits.
YES
Is 8bit-DIGITAL signal (HDMI-R/G/B) sent to pins (Y8)-(AB4) of 
IC801 (DVP-M2)?
NO
Check SDA2/SCL2 signal pins (66) and (65), interface between 
IC801 and lC8702, 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 – 20
<When EXT5 is used for external input>                           No picture on the display (7)
                                            
No EXT5 (PC- terminal) output of the external input system.
                                            
Checklist:
1) Is “INPUT SOURCE” button 
 on the remote control set up correctly? 
• • • Set it as “EXT5” with the INPUT SOURCE button on the remote 
control.
2) Connect the commercial PC-Cable to the PC terminal of an external device. 
• • • See the operation manual.
3) Is PC-Connector disconnected or connected improperly? 
• • • Connect it correctly as per the operation manual.
YES
Is “EXT5” selected with 
 button on the remote control?
NO
Select “EXT5” with 
 button on the remote control.
YES
Is ANALOG-RGB signal (PC_R/G/B) sent to pins (1), (2) and (3) 
of EXT5-TERMINAL (SC401)?
NO
Check PC-cable and external connection.
YES
Is ANALOG-RGB signal (PC_R/G/B) sent to pins (T1), (V1) and 
(M1) of IC801 (DVP-M2)?
NO
Check EXT5-TERMINAL 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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