DOWNLOAD Sharp LC-42LE40E Service Manual ↓ Size: 12.63 MB | Pages: 127 in PDF or view online for FREE

Model
LC-42LE40E
Pages
127
Size
12.63 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
lc-42le40e.pdf
Date
PREV: Sharp LC-42LE320E (serv.man5) Service Manual / Technical Bulletin

Sharp LC-42LE40E Service Manual ▷ View online

LC-32LE40E-LC-42LE40E 
45 
 
No picture on the display (1) 
↓ 
The picture doesn't appear in all modes.
 
MAIN UNIT:
  
 
     ↓ 
 
 
↓YES         
 
 
↓YES 
 
 
 
PANEL_UNIT:
  
 
    ↓YES 
 
 
↓YES 
 
 
 
 
No picture on the display (2) 
↓ 
Does not the picture come out when TV is received?
 
TERMINAL UNIT:
    
    ↓ 
 
 
 
                                      
↓YES 
 
 
MAIN_UNIT:
 
 
   
 
↓YES 
 
 
↓YES 
 
 
 
Is LCD controller's control signal normal?
Check the line between IC U401 and CN409, CN408.
NO 
 
Control signals BRIGHT_ADJ, INVERTER_ON_OFF, 
PANEL_VCC_ON/OFF, and it peels off and whether normality is 
checked.
Check the panel module. 
Similarly, is the LVDS signal input to connector of the panel 
module?
NO 
 
Wire harness is checked. (Main board to Panel module) 
Is LVDS signal output from 1st_channel and 2nd_channel of IC 
U401 in each mode? 
Check IC U401 and its peripheral control circuits.
Is DIF signal output from pin (13), (14) of TUNER (TU101) to pin 
(184), (185) of IC U401? 
Is the voltages of regulation for a TUNER circuit and the power 
supply terminal of IC U401 supplied? 
NO 
 
Each power supply circuit is checked.
 
NO 
 
Check the tuner, IC U401 and their peripheral circuits. Replace 
as required. 
Refer to “The picture doesn't appear in all modes.”
 
Is the above-mentioned LVDS signals output to connector 
CN409(for32″), CN408(for 42″)?
 
NO 
 
NO 
 
Do X4150 (27MHz) oscillate? 
NO 
 
Check X4150 and its peripheral circuits. 
LC-32LE40E-LC-42LE40E 
46 
 
No picture on the display (3) 
↓ 
Does not the picture come out when TV is received?
 
TERMINAL UNIT:
    
     ↓ 
 
 
MAIN_UNIT: 
 
      
↓YES 
 
 
 
 
                       
↓YES 
 
 
 
 
 
     
↓YES 
 
 
  
↓YES 
 
 
 
 
<External input (SCART)>No picture on the display (4) 
↓
  
Does not the picture of the CVBS signal input to SCART go out? 
TERMINAL_UNIT:
    
    ↓ 
 
 
 
MAIN_UNIT: 
 
    
↓YES 
 
 
↓YES 
 
 
 
 
<External input (SCART)>No picture on the display (5) 
↓
  
Does not the picture of the R/G/B video signal input to SCART go out? 
TERMINAL_UNIT:
    
    ↓ 
 
 
 
MAIN_UNIT: 
 
    
↓YES 
 
 
↓YES 
 
 
Is DIF signal output from pin (13), (14) of TUNER (TU101) to pin 
(35), (36) of IC U1011?
 
Is the voltage of regulation for a TUNER circuit and the power 
supply terminal of IC U401 supplied? 
NO 
 
Each power supply circuit is checked.
 
NO 
 
Check the tuner, IC U1011 and their peripheral circuits. Replace 
as required.
 
NO 
 
Are MPEG data (DEMOD_TSDATA0, TSSYNC, TSVAL, and TSCLK)
signals from pin (15), (16), (17), (18) of IC U1011 output to IC U401? 
Check MPEG data bus from IC TU1011 to IC U401.
Refer to “The picture doesn't appear in all modes.”
 
NO 
 
Is CVBS signal sent to pin (20) of SCART (CN151)?
 
Check the setting of an external input device that connects of 
CN151. 
Is CVBS signal sent to pin (175) of IC U401?
 
NO 
 
Check the circuit between IC U401 and CN151. 
Refer to “The picture doesn't appear in all modes.”
 
Do X4150 (27MHz) oscillate? 
NO 
 
Check X4150 and its peripheral circuits. 
NO 
 
Is RGB signal sent to pin (15/11/7) of SCART (CN151)?
 
Check the setting of an external input device that connects of 
CN151. 
Is RGB signal sent to pin (158/160/161) of IC U401?
 
NO 
 
Check the line between IC U401 and CN151. 
Refer to “The picture doesn't appear in all modes.”
 
LC-32LE40E-LC-42LE40E 
47 
 
<External input (Component)>No picture on the display (6) 
↓
  
Does not the picture of the component video signal input  to Component go out? 
TERMINAL_UNIT:
    
    ↓ 
 
 
 
MAIN_UNIT: 
 
    
↓YES 
 
 
↓YES 
 
 
 
 
<External input AV (Composite)>No picture on the display (7) 
↓ 
Does not the picture of the composite video signal input to AV(Composite) go out?
 
TERMINAL UNIT:
    
    ↓ 
 
 
MAIN_UNIT: 
 
    
↓YES 
 
 
 
 
 
    
↓YES 
 
 
 
 
<External input HDMI1 >No picture on the display (8) 
↓ 
Does not the picture of the HDMI signal input to HDMI1 go out?
 
MINI AV_UNIT:
  
 
    ↓ 
 
 
↓NO 
 
YES
 
 
 
 
 
                     
↓YES
 
 
 
   
                                                    
↓YES
 
 
 
    
↓YES 
 
 
Is CVBS signal sent to pin (2) of AV (CN136) ?
 
NO 
 
Check the setting of an external input device that connects of 
CN136.
 
Refer to “The picture doesn't appear in all modes.”
 
Is CVBS signal sent to pin (181) of IC U401?
 
NO 
 
Check the line between IC U401 and CN136.
Is the HOT_PLUG detection function of pin (19) of a HDMI terminal 
(CN502) normal?
 
NO 
 
Check the line between pin (50) of IC U501 and CN502.
Refer to “The picture doesn't appear in all modes.”
 
Check the connection and setup with the external HDMI devices.
Are EDID data pin (6) (SCL) of IC U503 (EEPROM), pin (5) (SDA) 
accessed, and is it read from pin (15), pin (16) of a HDMI terminal 
(CN502)? 
Is access possible in the re-writing or exchange of EDID data of 
IC U503? 
NO 
 
Is TMDS signal input into pin(63, 62)/RX2-2±,(60, 59)/RX2-1±, (57, 
56)/RX2-0±, (54, 53)/RX2-C± of IC U501? 
Check the line between IC U501 and CN502. 
NO 
 
NO 
 
Is Component Y/Pb/Pr signal sent to pin (2)/Y, (4)/Pb, (6)/Pr of 
AV1(CN111) ?
 
Check the setting of an external input device that connects of 
CN111.
 
Is Component Y/Pb/Pr signal sent to pin (163/165/166) of IC U401?
NO 
 
Check the line between IC U401 and CN111
Refer to “The picture doesn't appear in all modes.”
 
Is TMDS signal output from pin(17, 18)/ 2±,(20, 21)/ 1±, (23, 24)/ 0±, 
(26, 27)/_C± of IC U501? 
NO 
 
Check IC U501 and peripheral circuits. 
LC-32LE40E-LC-42LE40E 
48 
 
<External input HDMI2 >No picture on the display (9) 
↓ 
Does not the picture of the HDMI signal input to HDMI2 go out?
 
MINI AV_UNIT:
  
 
    ↓ 
 
 
↓NO 
 
YES
 
 
 
 
 
                     
↓YES
 
 
 
   
                                                    
↓YES
 
 
 
    
↓YES 
 
 
 
<External input VGA>No picture on the display (10) 
↓
  
Does not the picture of the PC IN(ANALOG) video signal input to VGA (15pin-D-SUB terminal) go out?
 
TERMINAL_UNIT:
   
    ↓ 
 
 
MAIN_UNIT: 
 
     
↓YES 
 
 
 
 
 
     
↓YES 
 
 
Is R/G/B/H/V signal sent to pin (1)/R, (2)/G, (3)/B, (13)/H, (14)/V of 
VGA (CN101)?
 
NO 
 
Check the setting of an external input device that connects of 
CN101.
 
Refer to “The picture doesn't appear in all modes.”
 
Is R/G/B/H/V signal sent to pin (156)/R, (154)/G, (152)/B, (151)/H, 
(150)/V of IC U401? 
NO 
 
Check the line between IC U401 and CN101.
Is the HOT_PLUG detection function of pin (19) of a HDMI terminal 
(CN506) normal?
 
NO 
 
Check the line between pin (35) of IC U501 and CN506.
Refer to “The picture doesn't appear in all modes.”
 
Check the connection and setup with the external HDMI devices.
Are EDID data pin (6)(SCL) of IC U504 (EEPROM), pin (5)(SDA) 
accessed, and is it read from pin (15), pin (16) of a HDMI 
terminal(CN506)? 
Is access possible in the re-writing or exchange of EDID data of 
IC U504? 
NO 
 
Is TMDS signal input into pin(48, 47)/RX3-2±,(45, 44)/RX3-1±, (42, 
41)/RX3-0±, (39, 38)/RX3-C± of IC U501?
Check the line between IC U501 and CN506. 
NO 
 
Is TMDS signal output from pin(17, 18)/ 2±,(20, 21)/ 1±, (23, 24)/ 0±, 
(26, 27)/_C± of IC U501? 
NO 
 
Check IC U501 and peripheral circuits. 
Page of 127
Display

Click on the first or last page to see other LC-42LE40E service manuals if exist.

RANDOM: