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Doc No.
Service Manu Version 1.0
TITLE
LCD TV For 232-S12
Page 1/44
Service Manual
LCD TV For 232-S12
Doc No.
Version1.0
Total Pages41
Approval Made by Revise by Revise by
Daniel Villa Randal J. Cook
Hans Chung Kanzi Lee 12/8/06
Troubleshooting/disassembling
12/7/06
2007/1/29 2007/1/29 /Firmware Update/EDID
Introduction
Update/Manual Structure
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Table of Contents
1. Introduction..................................................................................3
1-1 Preface....................................................................................................3
1-2 Caution...................................................................................................3
1-3 Warning..................................................................................................3
2. Specifications.................................................................................4
3. Wiring Diagram..............................................................................5
4. Trouble shooting flow chart.............................................................6
4-1 Abnormal Display.....................................................................................6
4-2 Abnormal Power On/Off.............................................................................7
4-3 LED Light Abnormal DisplayKeypad Problem...............................................8
4-4 Image Abnormal Display............................................................................9
4-5 Audio Abnormal Output.............................................................................10
4-6 The Other Abnormal Display.......................................................................11
5. Disassembly..............................................................................12
5-1 Stand......................................................................................................12
5-2 Back Cover..............................................................................................12
5-3 System Board...........................................................................................13
5-4 Power Module..........................................................................................14
5-5 Panel Module...........................................................................................15
5-6 Speaker.................................................................................................16
5-7 Keypad Board..........................................................................................16
6. Firmware upgrade..........................................................................17
7. EDID write in and ADC correction and Parameter Adjustment....................20
7-1 EDID write in..........................................................................................20
7-1.1 EDID tools..........................................................................................20
7-1.2 EDID write in.......................................................................................20
7-2 ADC Correction and Parameter Adjustment......................................................21
7-2.1 ADC Correction....................................................................................21
7-2.2 Parameter Adjustment...............................................................................22
8. Exploded view..............................................................................23
9. Parts List and Photo........................................................................25
9-1 Parts List................................................................................................25
9-2 Parts Photo............................................................................................26
9-3 Parts List(Low bright panel).....................................................................33
9-4 Parts Photo(Low bright panel)....................................................................34
10. Block Diagram...........................................................................41
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1. Introduction
1-1 Preface
This service manual describes module-level LCD TV repair for qualified service personnel.
This service manual also includes selected production troubleshooting information for
electronic technicians and engineers.
1-2 Caution
This service manual contains important safeguards and instructions that must be followed for
the safe and proper servicing of this TV.
1-3 Warning
1. Advise customers to follow all operating instructions and safety precautions that have been
furnished with the product.
2. Unplug the ac line cord before cleaning or disassembling the product.
3. Check the ac line cord and plug for wear or damage and replace as necessary.
4. Do not use liquid cleaners or aerosol cleaners to clean the display.
5. Do not place the product on an unstable table or cart. It can cause the product to fall,
resulting in injury and product damage. If a cart is used, use caution when moving the
cart/apparatus combination to avoid injury from tip-over.
6. Use only replacement parts specified by the manufacturer or replacement parts with the
same performance and safety characteristics. Use of substitute parts with different
characteristics can result in fire or electric shock.
7. Do not hit the LCD panel. In case of breakage, use care when removing broken glass.
8. Keep the product away from heat sources such as radiators, heaters, stoves, and other
heat-generating apparatus.
9. Do not block any ventilation openings.
10. Do not use the product near water; for example, near a bathtub, washbasin, kitchen sink
laundry tub, in a wet basement, or near a swimming pool.
11. If the product uses a grounded-type ac plug and line cord, but the location has a 2-prong
receptacle, advice the customer to contact a qualified electrician to replace the outlet.
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2. Specifications
PRODUCT SPECIFICATIONS
LCD Panel 32" TFT
Power Management
(Standby Mode) 1W
Displayable Resolution VGA 1360*768 max.
Pixel Pitch 0.17025mm x 0.51075mm x RGB
LCD Display Color 16.7M colors(8-bits colors).
Viewing Angle
178(H)/178(V) (CR>10)
Response Time 8ms (Gray to Gray)
Active Display Area 697.685mm x 392.256mm (31.51" diagonal)
RF Tuner
Combo RF (NTSC/ATSC)
Power Voltage : 100~240 V
Consumption : 164W
Speaker 10W
Compliance FCC, cUL, CSA, Energy Star
Temperature Operating: -10~40
Storage: -10~60
Weight w/o stand
33.63lbs
Weight w/ stand
35.5lbs
Gross Weight
45.421lbs
Dimensions (WxDxH)
37.76 inches x 9.37 inches x 22.20 inches
Carton Dimensions
(WxDxH) 42.80 inches x 12.40 inches x 25.35 inches
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3. Wiring Diagram
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4. Trouble shooting flow chart
4-1 Display Problems
Note: Refer to the Wiring Diagram during troubleshooting for a visual of inter-connections
when indicated by this symbol.
Trouble Condition Check Item Replace Material Test
Step1
1. Reconnect cable
1. Check for a loose video 2. Replace cable
cable connection Fail 3. Change source
2. Check video cable settings
Abnormal display 3. Check source settings 4. Change TV input
1. No video Image 4. Check TV input
5 Ch k S Ch l
5. Run auto Scan
2. Video noise OK
3. Display flashes
4. Abnomal color Step2 Fail
Secure connection
Check for a loose or broken or replace the
connection between Con.J28 LVDS wire
from system board to Panel
LVDS connection.
OK Fail 1.Replace Power
Step3 Module if voltage
1. Check System board (5Vs) is missing.
CN4-pin1 to ground = 5V, 2.Replace System
2. Check System Board board if voltage is
Bright spots CN4-pin3 to ground = 5V missing.
CN5-pin2 to ground = 12V
Dark spots
Backlight uniformity
Step1: Fail
Display Problems Check damage to Replace Panel
panel
Light leakage
OK
Step2: Fail
Check for a loose or Replace LVDS
broken connection connect wire
Spot & Simi between Con.J28 from
system board to Panel
LVDS connection.
Ghosting
Test
Dust & Scratch
Finish
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4-2 Abnormal Power On/Off
Trouble Condition Check Item Replace Material Test
Abnormal Power
On/Off
Step1:
Check Power Supply, Con. Fail Replace Power
No Power CN904