Sharp LC-15AV7U Support Question
Sharp LC-15AV7U Support Question
Find answers below for this question about Sharp LC-15AV7U.Need a Sharp LC-15AV7U manual? We have 1 online manual for this item!
Question posted by wdhalsey on October 1st, 2011
Problem - Tv Turns Off As Soon As I Turn It On - How Do I Fix?
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Current Answers
Answer #1: Posted by TVDan on October 1st, 2011 7:11 AM
TVDan
Member since:
August 8th, 2011 Points: 4,732,000
Member since:
August 8th, 2011 Points: 4,732,000
the likely problem is with the high voltage inverter section used to light the florescent lamp tubes in the LCD panel. in this small set this circuit is combined on one circuit board along with the power supply audio and video processing, input selection and systems control. this makes this board high priced, and unless you find a technician to troubleshoot the problem to the component level (then the bill is likely to be $175-$200), then the bill will be over $300.
TV Dan
Related Sharp LC-15AV7U Manual Pages
Service Manual - Page 1
... DISASSEMBLY INSTRUCTIONS 4-1 ELECTRICAL ADJUSTMENT INSTRUCTIONS 5-1 HOW TO INITIALIZE THE LCD TELEVISION 6-1 TROUBLESHOOTING ...7-1 BLOCK DIAGRAMS ...8-1 SCHEMATIC DIAGRAMS/ CBA'S AND TEST ... parts identical to change without notice.
MODEL LC-15AV7U SERVICE MANUAL
LCD COLOR TV
LC-15AV7U
SERVICE MANUAL
S17F1LC15AV7U
LCD COLOR TV
MODEL LC-15AV7U
In the interests of user-safety (Required ...
Service Manual - Page 4
...an abnormality exists that no cabinet openings through which they are provided on the Liquid Crystal Panel. 3. Any design alterations or additions will void the manufacturer's warranty and may be ... Standards Institute (ANSI) C101.1 Leakage Current for LCD TV Circuit
1. Read and comply with the instrument AC switch in turn to each tuner antenna input exposed terminal screw and, if...
Service Manual - Page 8
...cause damage or accident due to avoid a short circuit.
2 Using lead-free wire solder
When fixing the PWB soldered with steel wool or fine sandpaper. When you are indicated as shown.
< ...°C, and as you may be exceeded, remove the bit from the PWB as soon as it . Lead-free wire solder for extended period of the 3 pin Regulator... be apt to turn on the PWBs and service manuals.
Service Manual - Page 9
... when removing it. S-1-6)
With Iron Wire:
(1) Using desoldering braid, remove the solder from all pins of the flat pack-IC is fixed with glue, so be careful not to break or damage the foil of the flat pack-IC, you use solder flux which is affixed with glue to all pins of the...
Service Manual - Page 10
... may be melted). (Fig. S-1-6)
Note: When using tweezers. (Fig. S-1-7.) Be sure this mark matches the 1 on the flat pack-IC indicates pin 1. (See Fig. Be sure that the flat pack-IC is fixed with glue to center of the flat pack-IC is not being held by a " " mark. S-1-7
CBA
Fine Tip Soldeing Iron
Tweezers...
Service Manual - Page 15
TV Cable Wiring Diagram
Function CBA
CL1107
To LCD Module
Main CBA
To LCD Module
CN401 CN403
CN1301
CN1402 CN1411
CN1401
LVDS CBA Unit
CN1202
CN1201
Junction-A CBA
CL801
CN801
To Speaker
CN1302
CL1104
IR Sensor CBA
CN62
CN61
CN102 CN101
CN802
Junction-B CBA
CL802
DTV Module CBA Unit
To Speaker
Fig. D3
4-4
A7121DC
Service Manual - Page 16
... Win- dow, Red Color, Dot Pattern, Gray Scale, Monoscope, Multi-Burst) 3. Color Analyzer
How to access next item. Set initial data as shown on the TV unit simultaneously in the standby mode.
1. Table 1: Initial Data
ITEM
RF-BRT RF-CNT RF-CLR-R RF-CLR-B RF-TNT RF-SHR V-BRT V-CNT V-CLR...
Service Manual - Page 17
... to select "C-DR(C/D2)" for Blue adjustment. Press [VOL -] button on the TV unit.)
3.
Only when replacing the LCD Panel then adjust as shown above signal.
2. [RF/INPUT1]
Press [MENU] button on... the remote control unit and press [1] on the remote control unit. (selecting "BRT" mode).
5-2
A7121EA Turn the...
Service Manual - Page 18
... need to bright.
5. If "C" position is not available or to initial position.
4. [INPUT2]
Press [MENU] button on the remote control unit and press [3] on the TV unit.)
5-3
A7121EA If "C" position was beginning to adjust.
6. Turn the power off and on again. (Main power button on the remote control unit. (selecting "D1BRT" mode).
3.
Service Manual - Page 19
To enter the service mode, press [MENU] and [POWER] buttons on the upper right of the screen.
6-1
A7121INT Confirm "FF" indication on the TV unit simultaneously in the standby mode.
2. HOW TO INITIALIZE THE LCD TELEVISION
1. To initialize the LCD television, press [DISPLAY] button on the remote control unit.
3.
Service Manual - Page 20
Description
Page
1 The power cannot be turned on.
7-2
2 The fuse blows out.
7-2
3 When the output voltage fluctuates.
7-2
4 When buzz sound ...not output.
7-3
7 INV+22V is not output.
7-3
8 DTV-ON+3.3V is not output.
7-3
9 DTV-ON+2.5V is not output.
7-3
10 PANEL+3.3V is not output.
7-3
11 DTV-ON+5V is not output.
7-4
12 AL+3.3V(D) is not output.
7-4
13 AL+1.2V(D) is not output...
Service Manual - Page 21
... is shorted in each rectifying circuit of power circuit. 1. FLOW CHART NO.3 When the output voltage fluctuates. FLOW CHART NO.4 When buzz sound can be turned on the rectifying diode and the circuit in the vicinity of secondary side, and service it if defective. Is approximately 35V voltage supplied to the...
Service Manual - Page 23
... if defective.
Is approximately 6.8V voltage supplied to the Pin(3) of D903? Is approximately 6.8V voltage supplied to the cathode of emitter on Q905 when turning the power on Q905 lower than the voltage of D903?
FLOW CHART NO.13 AL+1.2V(D) is not output.
Service Manual - Page 24
... output.
Is approximately 12V voltage supplied to the
No
Check D911, C908 and their periphery circuit, and
service it if defective.
power on Q923 when turning the
service it if defective. No
Check D902, C902 and their periphery circuit, and
cathode of emitter on ?
No
Is the voltage of base on...
Service Manual - Page 29
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
DTV-ON-H 152 BACKLIGHT-SW ...
Service Manual - Page 34
...unit.
Q916 SWITCHING
+35V VT+33V
DTV-ON-H P-ON-H
CN1202
CN1402 CN1411
1~9 PANEL+3.3V 17~25
1~2 PANEL+3.3V
TO SYSTEM CONTROL BLOCK DIAGRAM
LVDS CBA UNIT
TO LCD MODULE
A7121BLP CAUTION !... +1.8V REG. Power Supply Block Diagram
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD. Fixed voltage (or Auto voltage selectable) power supply circuit is measured using hot GND as a ...
Service Manual - Page 37
... Note: Mark " " is used 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 foil side. :... Used to indicate a test point with no test pin. : Used to the AC power supply.
CAUTION: Fixed Voltage (or Auto voltage selectable) power supply circuit is a leadless (chip) component.
6. CAUTION: FOR CONTINUED...
Service Manual - Page 42
... 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. Fixed voltage (or Auto voltage selectable) power supply circuit is used in the power supply circuit to see that all components in hot circuit is blown...
Service Manual - Page 48
...
F-1
Q404
F-1
Q405
F-1
Q406
F-1
Q407
F-1
Q421
F-2
Q422
F-2
Q424
F-1
Q425
F-1
Q461
F-3
Q462
F-4
Q464
F-3
Q601
D-5
Q603
D-5
Q707
C-1
Ref No. MAIN CBA
Ref No. Main CBA Top View
CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is measured using hot GND as a common terminal.
Also, in hot circuit is used . NOTE: The voltage...
Service Manual - Page 49
Fixed voltage (or Auto voltage selectable) power supply circuit is required.
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
Because a hot chassis ground is present in ...
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