Sharp LC-20AV7U Support Question
Sharp LC-20AV7U Support Question
Find answers below for this question about Sharp LC-20AV7U.Need a Sharp LC-20AV7U manual? We have 1 online manual for this item!
Question posted by calvincollierjr on August 13th, 2011
Sharp Tv Picture Issues Continues To Change Channels Automatically.
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Related Sharp LC-20AV7U Manual Pages
Service Manual - Page 1
... 12-1 EXPLODED VIEWS ...13-1 MECHANICAL PARTS LIST ...14-1 ELECTRICAL PARTS LIST ...15-1
This document has been published to change without notice.
SERVICE MANUAL
LCD COLOR TELEVISION
LC-20AV7U/LC-20SH7U
SERVICE MANUAL
S37F3LC20AV7U
LCD COLOR TELEVISION
MODEL LC-20AV7U
MODEL LC-20SH7U
In the interests of user-safety (Required by safety regulations in some countries) the set should be...
Service Manual - Page 2
... appear as a tiny spec of Pixels 2. SPECIFICATIONS
< TUNER >
VHF/UHF Input : 75 ohm Unbal., F type Intermediate Freq. : Picture 45.75 MHz, Sound 41.25 MHz
Description 1. Audio S/N
Condition
Unit
80dB
dB
80dB
dB
Nominal -----
< LCD PANEL >
Description 1. Audio S/N
Condition
Unit
10% THD: Lch/Rch
W
500mW: Lch/Rch
%
-6dB: Lch
Hz
-6dB: Rch...
Service Manual - Page 3
MULTIPATH
6. VHF LOW BAND. CH.10
UHF BAND. CH.4 VHF HI BAND. CH.41 VHF LOW BAND. CH.4 VHF HI BAND. NTSC CO-CHANNEL
INTERFERENCE
5.
CH.10
UHF BAND. ATSC SUSCEPTIBILITY TO
RANDOM NOISE 4. Audio DIST. (0dBfs)
Condition + - CH.41 A B C D E F FF G Lch
Rch Lch Rch
Unit
Nominal
Limit
kHz
---
>...
Service Manual - Page 6
... to be removed, unhooked, unlocked, released, unplugged, unclamped, or desoldered.
No.
CABINET DISASSEMBLY INSTRUCTIONS
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
[ LC-20AV7U ]
1. Removal
Step/ Loc.
No.
Unlock/Release/ Unplug/Unclamp/
Note
Desolder
[1] Base Plate D1 4(S-1), 7(S-2)
---
[2]
Stand Arm Assembly
D1 6(S-3)
---
[3]
Stand Cover
D1
---
[4]
Rear...
Service Manual - Page 9
TV Cable Wiring Diagram
Main CBA
CN401
Function CBA
CL1107
CN1301
To LCD Module
CN1202
CN1201
To LCD Module
CN402
Junction-A CBA
CL801
To Speaker
CN403 CN801
CN1302
CL1104
IR Sensor CBA
CN62
CN61
CN102 CN101
CN802
Junction-B CBA
CL802
DTV Module CBA Unit
To Speaker
Fig. D3
4-4
A7144_45DC
Service Manual - Page 13
D3
4-8
A7144_45DC TV Cable Wiring Diagram
Main CBA
CN401
Function CBA
CL1107
CN1301
To LCD Module
CN1202
CN1201
To LCD Module
CN402
To Speaker
CN403 CN801
CN1302
CL1104
IR Sensor CBA
CN62
CN61
CN102 CN101
DTV Module CBA Unit
CN802 To Speaker
Fig.
Service Manual - Page 14
... and certain mechanical parts. Remote control unit 4. Set initial data as shown on the TV unit simultaneously in the standby mode.
1. o / p] to access next item. NTSC...CLR-R DT-CLR-B DT-TNT DT-SHR COR(C/D1) C-COR(C/D2) COB(C/D1) C-COB(C/D2)
Button (on the table to change data value.
Press the number after [MENU] on the remote control) [MENU] → [3]
[MENU] → [4]
[...
Service Manual - Page 15
...control unit and select "C/D2" mode.
5. [RF/INPUT1]----(APL 80%) Press [6] button to the center on the TV unit.)
L = 3 cm
INPUT: WHITE 80%, 20% Color Analyzer
Note: Use the service remote control unit 1....adjustment. Initial Setting." [INPUT2]----(APL 20%) Press [3] button to the LCD Panel surface. 4. [RF/INPUT1] Enter the Service mode. Turn the power off and on again. (Main power button...
Service Manual - Page 16
...be obtained by adjusting the Brightness Control. Enter the Service mode. 3.
If "C" position was beginning to initial position.
4. input, Any channel, SMPTE pattern, [RF/INPUT1]: CG-931 (KENWOOD), [INPUT2]: CG-931 (KENWOOD), w/SETUP 7.5IRE
M. If "C" position is incorrect,...INPUT2] Press [MENU] button on the service remote control unit and press [3] on the TV unit.)
5-3
A7144EA
Service Manual - Page 17
HOW TO INITIALIZE THE LCD TELEVISION
1. To enter the service mode, press [MENU] and [POWER] buttons on the upper right of the screen.
6-1
A7144INT Confirm "FF" indication on the TV unit simultaneously in the standby mode.
2. To initialize the LCD television, press [DISPLAY] button on the remote control unit.
3.
Service Manual - Page 18
....
7-3
10 DTV-ON+5V is not output.
7-3
11 AL+3.3V(D) is not output.
7-4
12 PANEL+3.3V is not output.
7-4
13 AL+1.2V(D) is not output.
7-4
14 AL+3.3V(A) is not ... remote control unit.
7-7
22 Picture does not appear normally. (Tuner input (Analog) / Video input/S-Video input) 7-8
23 Picture does not appear normally. (Tuner input (Digital))
7-8
24 Picture does not appear normally. (Y ...
Service Manual - Page 25
... the Y signals outputted to the Pin(19) of IC1202? VIDEO SIGNAL SECTION
FLOW CHART NO.22 Picture does not appear normally. (Tuner input (Analog)/ Video input/S-Video input)
Are the video signals inputted...signals inputted to the Pin(18) of IC1202 , and service it if defective.
FLOW CHART NO.24 Picture does not appear normally. (Y / Pb / Pr input)
Check the line between each pin of ...
Service Manual - Page 28
IC1202 (TV MICRO CONTROLLER) KEY-IN-2 4 KEY-IN-1 3 REMOTE 27
RESET 94
XIN 37 XOUT 38
Q917 RESET
AL+3.3V(D)
X1301 27MHz
VCOM 19
DTV-ON-H 152 ...
Service Manual - Page 33
... not defective before you connect the AC plug to fail.
4A/125V
CAUTION ! : For continued protection against risk of fire, replace only with same type 4 A, 125V fuse.
Q909 SW+2....Q919 SWITCHING
DTV-ON-H P-ON-H
TO SYSTEM CONTROL BLOCK DIAGRAM
CN1202 2 PANEL+25V 3 PANEL+25V 5 PANEL+3.3V 6 PANEL+3.3V 8 PANEL+10.8V 10 PANEL-6V
TO LCD MODULE
A7144BLP
NOTE: The voltage for parts in this unit...
Service Manual - Page 36
...) is blown, first check to see that all components in the power supply circuit are as shown below: Plug the TV power cord into a standard AC outlet.:
Voltage
1 2 5.0
3 5.0
Power on the schematics are not defective before... number "1" goes to 3 digits)
3
1-B1
AREA D3
Examples:
2
AREA B1
1. CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WITH SAME TYPE_A,_V FUSE.
Service Manual - Page 41
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
4A/125V
CAUTION ! : For continued protection against risk of fire, replace only with same type 4 A, 125V fuse. NOTE: The voltage for parts in hot circuit is used in this unit. ...
Service Manual - Page 46
...CN62
B-4
CN401
F-1
CN402
F-3
CN403
F-4
CN801
F-5
CN802
A-5
CN1201
A-1
CN1202
B-1
CN1301
D-1
CN1302
D-1
CN1303
E-1
9-12
BA7140F01013-1 NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
4A/125V
CAUTION ! : For continued protection against risk of fire, replace only with same type 4 A, 125V fuse. NOTE: The voltage for parts in hot circuit is required. ATTENTION : Utiliser un...
Service Manual - Page 47
... de 4A, 125V. WF4 PIN 75 OF IC1202
WF2 PIN 76 OF IC1202
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
4A/125V
CAUTION ! : For continued protection against risk of fire, replace only with same type 4 A, 125V fuse. WF5 PIN 56 OF IC1202
WF3 PIN 57 OF IC1202
WF6 PIN 66...
Service Manual - Page 51
... Address 1 Input
3 A2
Slave Address 2 Input
4 GND
GND
5 SDA
Serial Data
6 SCL
Serial Clock
7 WP
Write Protect
8 VCC
VCC
IC1202 (LCD Drive / LCD Signal Process / TV Micro Controller)
Pin No. Signal Name
Function
1 V-OUT
Video Signal Output
2 DEFECT-SW Defect Switching
3 VCC
VCC
4 DET-OUT
Video Detect Output
5 APC
APC Filter...
Service Manual - Page 76
... or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher. LC-20AV7U/LC-20SH7U
COPYRIGHT © 2007 BY SHARP CORPORATION
ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in USA
SHARP ELECTRONICS CORPORATION Sharp Plaza, Mahwah, New Jersey 07430-2135
1
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