DOWNLOAD Sharp LC-26SB25E Service Manual ↓ Size: 12.72 MB | Pages: 117 in PDF or view online for FREE

Model
LC-26SB25E
Pages
117
Size
12.72 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
lc-26sb25e.pdf
Date
PREV: Sharp LC-26SA1E (serv.man10) Service Manual / Technical Bulletin

Sharp LC-26SB25E Service Manual ▷ View online

         2008-03-14 
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU 
 45 
No picture on the display (3)
 
↓ 
Does not the picture come out when DTV is received?
 
TERMINAL UNIT:
    
 
↓ 
 
 
 
 
 
 
↓YES 
 
 
TERMINAL UNIT:
   
 
↓YES 
 
 
 
↓YES 
 
 
↓YES 
 
 
 
MAIN_UNIT:    
↓YES 
 
 
 
 
 
 
↓YES 
 
 
↓YES 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Is IF signal output from pin (17), (19) of TUNER (TU200) to pin (43),
pin (44) of IC U231 (COFDM)?
 
Is the voltage of regulation for a TUNER circuit and the power 
supply terminal of IC U231 supplied? 
NO 
Each power supply circuit is checked.
 
NO 
Check the tuner, IC U231 and their peripheral circuits. Replace
as required.
 
Similarly, is communication control carried out between pin
(6)(SCL), pin(9)(SDA), pin(12)(AGC) of TU200, and pin(38), pin
(37), pin(35) of IC U231?
 
NO 
Does Y230 (27MHz) oscillate?
 
NO 
Check Y230 and its peripheral circuits.
 
NO 
Is MPEG data (TS0INDATA[0..7], TS0INSYNC, TS0INCLK,
TS0INVALID) from IC U231 are output to pin
(6/7/8/9/11/12/13/14/16/17/18) of a IC U401?
 
Is the control signal between IC U231 and IC U400 normal?
(CHN_DEC_RESET, MAIN_SDA, MAIN_SCL, etc.).
 
Is MPEG data (TS_DATAO, TS_CKO, TS_VALIDO, TS_SYNCO) 
from IC U401 are output to pin (A26/D23/C24/B26) of a IC U400?
NO 
Is the control signal between IC U401 and IC U400 normal? 
(RESET_CI, etc.).
 
Do X300 (60.00MHz)/ X400 (27MHz) oscillate? 
 
NO 
Check X300/ X400 and its peripheral circuits.
Refer to “The picture doesn't appear in all modes.”
 
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU 
46  
<External input SCART1, SCART2>No picture on the display (4)
 
↓ 
Does not the picture of the CVBS signal input to SCART1 go out?
 
Does not the picture of the CVBS signal input to SCART2 go out?
 
TERMINAL UNIT:
    
 
↓ 
 
 
 
MAIN_UNIT:    
↓YES 
 
 
 
 
 
 
 
 
↓YES 
 
 
 
<External input SCART1>No picture on the display (5)
 
↓ 
Does not the picture of the R/G/B video signal input to SCART1 go out?
 
TERMINAL UNIT:
    
 
↓ 
 
 
MAIN_UNIT:    
↓YES 
 
 
 
 
 
 
 
↓YES 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Is CVBS signal sent to pin (20) of SCART1 (CN500)?
 
NO 
Check the setting of an external input device that connects of
CN500.
 
Refer to “The picture doesn't appear in all modes.”
 
NO 
Check the setting of an external input device that connects of
CN501.
 
Is CVBS signal sent to pin (20) of SCART2 (CN501)?
 
Is CVBS signal sent to pin (AF25) of IC U400?
 
Is CVBS signal sent to pin (AF26) of IC U400?
 
NO 
NO 
Check the line between IC U400 and CN500.
Check the line between IC U400 and CN501.
Is RGB signal sent to pin (15)/R, (11)/G, (7)/B, of SCART1
(CN500)?
 
NO 
Check the setting of an external input device that connects of
CN500.
 
Refer to “The picture doesn't appear in all modes.”
 
Is RGB signal sent to pin (AE23)/R, (AE22)/G, (AD21)/B of IC
U400?
 
NO 
Check the line between IC U400 and CN500.
         2008-03-14 
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU 
 47 
<External input SCART1, SCART2>No picture on the display (6)
 
↓ 
Does not the picture of the Y/C signal input to SCART1 go out?
 
Does not the picture of the Y/C signal input to SCART2 go out?
 
TERMINAL UNIT:
    
 
↓ 
 
 
 
 
MAIN_UNIT:    
↓YES 
 
 
 
 
 
 
 
 
↓YES 
 
 
 
Is Y/C signal sent to pin (20) and (15) of SCART1 (CN500)?
 
NO 
Refer to “The picture doesn't appear in all modes.”
 
NO 
Is Y/C signal sent to pin (20) and (15) of SCART2 (CN501)?
 
Is Y/C signal sent to pin (AF25)/Y, (AE24)/C of IC U400?
 
Is Y/C signal sent to pin (AF26)/Y, (AE25)/C of IC U400?
 
NO 
NO 
Check the line between IC U400 and CN500.
Check the line between IC U400 and CN501.
Check the setting of an external input device that connects of
CN500.
 
Check the setting of an external input device that connects of
CN501.
 
LC-26SB25E/S/RU, LC-32SB25E/S/RU, LC-42SB55E/S/RU 
48  
<External input AV3(Composite)>No picture on the display (7)
 
↓ 
Does not the picture of the composite video signal input to AV3(Composite) go out?
 
TERMINAL UNIT:
    
 
↓ 
 
 
MAIN_UNIT:    
↓YES 
 
 
 
 
 
 
↓YES 
 
 
 
<External input AV3(Y/C)>No picture on the display (8)
 
↓ 
Does not the picture of the Y/C video signal input to AV3(Y/C) go out?
 
TERMINAL UNIT:
    
 
↓ 
 
 
MAIN_UNIT:    
↓YES 
 
 
 
 
 
 
↓YES 
 
 
 
Is CVBS signal sent to pin (2) of AV3 (CN650) ?
 
NO 
Check the setting of an external input device that connects of
CN650.
 
Refer to “The picture doesn't appear in all modes.”
 
Is CVBS signal sent to pin (AD26) of IC U400?
 
NO 
Check the line between IC U400 and CN650.
Is Y/C signal sent to pin (8)/Y, (7)/C of AV3 (CN650) ?
 
NO 
Check the setting of an external input device that connects of
CN650.
 
Refer to “The picture doesn't appear in all modes.”
 
Is Y/C signal sent to pin (AD25)/Y, (AE26)/C of IC U400?
 
NO 
Check the line between IC U400 and CN650.
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