DOWNLOAD Sharp LC-19D1EWH (serv.man5) Service Manual ↓ Size: 1.14 MB | Pages: 24 in PDF or view online for FREE

LC-19D1E/S-BK/WH

4 – 9

                                            
No sound from EXT5 (AUDIO) connecting an external input 
device.

                                            
<EXT5>
Is PC-S-L audio signal input from J401 to pin (7) of IC301?
Is PC-S-R audio signal input from J401 to pin (3) of IC301?

YES

Is PC-S-L audio signal input to pin (42) of IC501 (AV-SW)? 
Is PC-S-R audio signal input to pin (40) of IC501 (AV-SW)? 

NO

Check Connector SC1202 pins (9) and (10), Connector SC501 
pins (9) and (10) and short circuit.

YES

Is the audio signal (TERMINAL-L/R) properly output from pins 
(34) and (33) of IC501 (AV-SW)? 

NO

Check the Power supply input of pin(38) of IC501, or SDA2/SCL2 
signal of pins (28) and (29) or peripheral circuits.

YES

Is the audio signal (LOUT2/ROUT2)  output properly from pins 
(25) and (23) of  IC302  (A-CODEC) ?   

NO

Check pins (1) and (4) of  IC302 (A-CODEC) , pins (11) and (12) 
of  Connector SC1202, audio-mute line (Q301/Q302) or periph-
eral circuits. 

YES

Is the audio  signal L-CH output to  pins  (44-45) and (40-41)  of  
IC303 (POWER-AMP)? Is the audio  signal R-CH output to  pins  
(20-21) and (16-17) of  IC303 (POWER-AMP)  normally ?     

NO

Check UR12V power supply input pins (47) and (14) of  IC303 
(POWER-AMP) or peripheral circuits.  

YES

Is the audio signal of pins (1)-(4) of  SP-Connector (P301)  prop-
erly output?

NO

Check SP-CONNECTOR (P301) and short circuit.

YES

Check SP-BOX (right and left) and WIRE HARNESS.  

LC-19D1E/S-BK/WH

4 – 10

                                            
No audio output from headphone (J505).

(AV-UNIT)                             
Is there audio output signal on pins (2) and (3) of the headphone 
terminal (J505)?

YES

Check Headphone terminal (J505) and the connection to an 
external device.

NO

Is “H” signal at base of Q527, Q526? 

YES

Pin (D11) of IC801 (DVP-M2) should usually be “L”.
If “H” signal, check IC801 and peripheral circuits.

(MAIN-UNIT)                         

NO

Is the audio output signal of pins (30) and (29) of IC302 (A-
CODEC) proper? 

YES

Check pins (12) and (11) of Connector SC1203, pins (12) and 
(11) of Connector P502 and peripheral circuits.

(AV-UNIT)                             

NO

Is the audio output signal (TERMINAL-L/R) properly output from 
pins (34) and (33) of IC501 (AV-SW)?

YES

Check pins (11) and (12) of Connector SC1202, pins (11) and 
(12) of Connector P501 and peripheral circuits.

(MAIN-UNIT)                         

NO

Is the audio output signal (MPX-A-L/R) properly output from pins 
(11) and (15) of IC301 (A-Selector)?

YES

Check pins (9) and (10) of Connector SC1202, pins (9) and (10) 
of Connector P501 and peripheral circuits.

NO

Is the audio output signal (DVPM2-L/R) properly output from pins 
(B23) and (D23) of IC801 (DVP-M2)? 

YES

Check the AUDIO signal line between IC301 and IC801, or 
peripheral circuits.

NO

Check the power supply input B3.3V pins (R19) and (D5), B1.5V 
pins (D12) of IC801 (DVP-M2) or peripheral circuits.

                                             
No audio output from EXT1 (SCART1) terminal.

                                             
Checklist:
1) Is the MUTE button on the remote control set to ON? 

• • • Set to OFF.

2) Check the connection to external devices. 

• • • Is there any improper connection?

                                             
Is audio signal output to pins (3) and (1) of EXT1 (SC501)?

YES

Confirm EXT1 (SC501) and the connection to an external eivice.

NO

Is the audio output signal (L/R-OUT) output to pins (7) and (1) of 
IC506 (A-AMP)? 

NO

Is the audio output signal (DVPM2-L/R) properly output from pins 
(B23) and (D23) of IC801 (DVP-M2)? 

YES

Check pins (20) and (21) of Connector SC1202, pins (20) and 
(21) of Connector P501 and peripheral circuits.

NO

Check the power supply B3.3V pins (R19) and (D5), B1.5V pins 
(D12) of IC801 (DVP-M2) or peripheral circuits.

LC-19D1E/S-BK/WH

4 – 11

<0n input of the DTVtuner>                                                               No picture on the display (1)-1 

No picture appears on LCD during the DTV tuner reception.

YES

Checklist:
1) Is "INPUT SOURCE" button 

 on the remote control set up correctly ? 

• • • set it as "DTV" 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 the level of pin (9)(8) of tuner (TU201) at "H"? 

• • • These are serial communications lines (I2C) for the control. If it is "L", check whether 

something pulls it to "L".  (IC801 (A5)(C4)pin)

(AV-UNIT)

YES

Is the DTV-R/G/B signal  output from pin (4)/(3)/(2) of Connector 
P503? 
Is the DTV-CVBS signal output from pin (6) of connector P503? 

YES

Is the DTV-R/G/B signal input to pin (9)/(1)/(14) of IC507(SW)?
Is the DTV-CVBS signal input to pin (4) of IC508(SW)?

NO

Check the course between Connector P503 and IC507(SW).
Check the course between Connector P503 and IC508(SW).

YES

Is the SC-R/G/B signal output from pin (6)/(3)/(5) of IC507(SW)?
Is the DTV-CVBS signal output from pin (2) of IC508(SW)?

NO

Check pins (13) of B9V line of IC507, and soldering.
Check pins (3) of B9V line of IC508, and soldering.

(MAIN-UNIT)

YES

Is the SC-R/G/B signal input to pin (N1)/(J1)/(K2) of IC801(DVP-
M2)?
Is the DTV-CVBS signal input to pin (W1) of IC801(DVP-M2)?

NO

Check pins (16)/(17)/(18) of Connector SC1203, (16)/(17)/(18) 
of Connector P502 and  peripheral circuits. (At the RGB signal).
Check pins (14) of Connector SC1203, (14) of Connector P502 
and  peripheral circuits. (At the CVBS signal)

YES

Is LVDS video signal (RA 

± ~ RD ±) output from pins (P22)(P23) - 

(V22)(V23) of  IC801 (DVP-M2), and is RCLK signal (RCLK 

±) out-

put 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 from 

pins (53) -(72) of  IC9201 (RSDS-TRANSMITTER) , and is CLK 
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. 

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 sig-
nal: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-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 
respectively. 

YES

 Replace LCD-PANEL. 

LC-19D1E/S-BK/WH

4 – 12

No picture appears on LCD during the 
DTV tuner reception.

YES

Checklist:
1) Is "INPUT SOURCE" button 

 on the remote control set up correctly ? 

• • • set it as "DTV" 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 the level of pin (9)(8) of tuner (TU201) at "H"? 

• • • These are serial communications lines (I2C) for the control. If it is "L", check whether 

something pulls it to "L".  (IC801 (A5)(C4)pin)

(AV-UNIT)

YES

 
(DIGITAL-UNIT)

Is the DTV-R/G/B signal  output from 
pin (4)/(3)/(2) of Connector P503? 
Is the DTV-CVBS signal output from 
pin (6) of connector P503? 

NO

Is the DTV-R/G/B signal output from 
pin (15)/(16)/(17) of IC4001(D-PRO-
CESSOR)?    Is the DTV-CVBS sig-
nal output from pin (18) of IC4001?

YES

Check connector SC4602 and 
IC4603. Check Q4601.

NO

Is the serial- signal (TOUTD[7]) input 
to pin (36) of IC4001(D-PROCES-
SOR)? 

YES

Check pins (3-129)/(151-212)/(8-
204) of 3.3V/2.5V/1.2V power line of 
IC4001, pins (6)(7) of I2C line, and 
soldering.

(AV-UNIT)

NO

Is the serial signal (FED[7]) output 
from pin (33)-(43) of IC202(DVB-T)?  

YES

Check pins(3) of Connector SC4601 
or pins(3) of connector P202. 

NO

Is the digital-IF signal IF(D1/D2) input 
to pin (10)/(11) of IC202(DVB-T)?

YES

Check pins (22)/(2)/(19) of 3.3V/
2.5V/1.0V power supply input of 
IC202(DVB-T), pins (29)/(30) of I2C 
line, and soldering.

NO

Is the Digital-IF signal IF(D1/D2) out-
put from pin (17)/(16) of  Tuner 
(TU201)?

NO

Check the B5V/B5V(CONT)/IF5V 
power supply input pin (11)/(1)/(3) of  
TUNER (TU201), pins (9)(8) of I2C 
line, and soldering.

NO

Replace Tuner (TU201).