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SERVICE MANUAL
LCD TV
SPECIFICATIONS
Power supply: AC 100-240V 50/60Hz
Power Consumption: 130 W
Dimensions: 568(W) x 436(H) x 172(D)mm
Weight: 9 kg
Screen: 20''
TV system & channel coverage:
System
VHF
PAL-B/G
2-12
TV system: PAL BG, NTSC(AV)
Speaker: 8W, 8Ωx2
LCD-20XR1/AU
UHF
CATV
21-69
X-Z+2, S1-S41
FILE NO.
LCD-20XR1/AU
PRODUCT CODE No.
1 682 340 53 : Australia
REFERENCE No. SM0915003
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Table of Contents
Troubleshooting
Related Manuals for Sanyo LCD-20XR1/AU
Summary of Contents for Sanyo LCD-20XR1/AU
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Page 1: Service Manual
FILE NO. LCD-20XR1/AU SERVICE MANUAL PRODUCT CODE No. 1 682 340 53 : Australia LCD TV LCD-20XR1/AU SPECIFICATIONS Power supply: AC 100-240V 50/60Hz Power Consumption: 130 W Dimensions: 568(W) x 436(H) x 172(D)mm Weight: 9 kg Screen: 20’’ TV system & channel coverage:... -
Page 2: Table Of Contents
CONTENTS Safety instructions………………………………………………………………………..… Alignment instruction ……………………………….…….……………………………….… Trouble shooting ……………………………………………………….…………………… Method of software upgrading ………………………………………….…….…………… The unit working principle analysis……………………………….…………..…………. Block diagram…………………………………..………………………………..………… IC block diagram………………………………………………………………………..…… Identification criteria for the bright spot and dark spot of the LCD screen………..…. Wiring diagram ……………………………………………………………..……………... Troubleshooting charts………………………………………………………………..……... -
Page 3: Safety Instructions
SAFETY INSTRUCTIONS Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety instructions 1. Instructions Be sure to switch off the power supply before replacing or welding any components inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will;... - Page 4 SAFETY INSTRUCTIONS would be unable to work and no way to get it repaired. 2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling.
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Page 5: Alignment Instruction
ALIGNMENT INSTRUCTION Alignment instruction 1 Alignment equipment PM5518 (video signal generator) K-7253 (VGA signal generator) CA210 (white balancer) IF signal generator Signal generator Oscillograph 2 Alignment flow-chart The alignment flow-chart is shown as Fig-1 Write memory N300 and N400 To produce main board and power supply board Check power supply board and main adjustment All testing Connect with central signal source, then check each function of TV(Station... - Page 6 ALIGNMENT INSTRUCTION SYSTEM) for X210, input 9v(±0.05v) and 5v(±0.05v) to J202 and J203, adjust L210 to let x205 voltage to be 1.65v(±0.1v). b. Solder to J201, J202, J203 and J5 3.3.2 AGC adjustment Receiving 60dB signal of D-8 or A-7(N system), adjust RP201 to let 3v(±0.05v) of X204. Input 100dB of antenna, the picture should not no-sync and distortion.
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Page 7: Trouble Shooting
ALIGNMENT INSTRUCTION AND TROUBLE SHOOTING 800 x 600 @ 60 40.000 37.879 60.317 1024 x 768 @ 60 65.000 48.363 60.004 1024 x 768 @ 70 56.48 70.07 1280 x 1024 @ 60 109.47 63.72 e). YPbPr Interface Input YPbPr signal to YPbPr/YcbCr interface. Separately input the several types of YPbPr format signals: 480P/60Hz, 480P/59Hz;... - Page 8 TROUBLE SHOOTING red LED at the front of the TV set) See if it’s receiving the signal that is transmitted from other source than the station Check if it’s connected to the wrong terminal or if the input mode is correct. Check if the signal cable connection between video source and the liquid crystal TV set is correct.
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Page 9: Method Of Software Upgrading
TROUBLE SHOOTING AND METHOD OF SOFTWARE UPGRADING Check if the sound volume is set to minimum. Make sure the earphone is not connected. Check if the cable connection is loose. When playing VHS picture search When being played or in pause VHS picture search tape, there are lines at the top or tape sometimes can’t provide stable picture, which bottom of the picture. - Page 10 METHOD OF SOFTWARE UPGRADING 5. Connect the VGA MONITOR interface on the Y# updating board with the VGA cable, connect the other end to the VGA interface of the LCD. 6. Turn on the LCD 7. Run Gprobe5 Click the icon of Set the Device to Parallel.
- Page 11 METHOD OF SOFTWARE UPGRADING Select the path of the File: bat.txt Select bat.txt and click to open it: Click “OK” to start the process of burning the program. The following screen appears when the process if finished. If you want to update the software next time, you just need to click the pull-down menu to select the desired Batch file and execute it in the following screen.
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Page 12: The Unit Working Principle Analysis
THE UNIT WORKING PRINCIPLE ANALYSIS The unit working principle analysis For the PAL system, when the RF signal is input to the tuner, the turner generates IF signal. Then the IF signal goes through the pre-amplifying circuit and 38M SAW, the VIF signal and 1ST_SIF signal will be generated. -
Page 13: Block Diagram
BLOCK DIAGRAM... -
Page 14: Ic Block Diagram
IC BLOCK DIAGRAM As follows we are going to introduce the inner IC block diagram and function. 1. Inner block diagram of M52760 IF signal processing IC (AFT, QIF, VIDEO OUT) Descriptions of the pins: Description Description 4, 5 VIF input QIF OUT 1ST_SIF input AUDIO OUT... - Page 15 IC BLOCK DIAGRAM Descriptions of the pins of R2S15900SP Function Function 2, 7 Left/right input for Channel 1 17, 18 SDA, SCL 3, 26 Left/right input for Channel 2 4, 25 Left/right input for Channel 3 11, 19 LOUT, ROUT 3.
- Page 16 IC BLOCK DIAGRAM 4. Inner block diagram of TPA1517 6W stereo audio amplifier...
- Page 17 IC BLOCK DIAGRAM 5. Inner block diagram of FLI8125 digital video processing IC The descriptions of the pins of FLI8125IC Pin name Connections Pin name Connections KEYA Key A S-video terminal identification KEYB Key B Pulse width adjustment AUD_SEL_1 RESETn Reset AUD_SEL_2 XTAL...
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Page 18: Identification Criteria For The Bright Spot And Dark Spot Of The Lcd Screen
IDENTIFICATION CRITERIA FOR THE BRIGHT SPOT AND DARK SPOT OF THE LCD SCREEN Q’ty allowed Distance between two spots Category criteria 15" 20" 22" 30" 40" 15" 20" 22" 30" 40" One single ≤5 ≤2 ≤5 ≤2 ≤3 spot Bright ≥15mm 2 neighboring ≤2... -
Page 19: Wiring Diagram
WIRING DIAGRAM Right speaker Back light board Left speaker... -
Page 20: Troubleshooting Charts
TROUBLESHOOTING CHARTS This series models adopt built-in power. The power to the main board may be different when the unit adopts different panels or whether the audio amplifier is located on the main board or not. The following is the detailed power in different cases. Power socket Model... - Page 21 TROUBLESHOOTING CHARTS 2. With picture and without sound when turning on: Increase the volume; Check if the no sound channel from the signal check whether every input to sound processing IC IC15900 is normal channel has no sound Check whether the signal 15900(IC) or peripheral circuit output by 15900(IC) is does not work normally...
- Page 22 TROUBLESHOOTING CHARTS 5. Check flow of the power board (20”): Replace the fuse and check Power board damages Replace N501, D501 whether N501, D501 or fuse blows breakdown Check whether C512 has 18V Replace D502 Check whether pin1 of N501has wave Check whether N502 is damaged Replace N502...
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Page 23: Schematic Diagram
SCHEMATIC DIAGRAM-1 (INTERFACE) - Page 24 SCHEMATIC DIAGRAM-2 (TUNER&AUDIO)
- Page 25 SCHEMATIC DIAGRAM-3 (SCALER FLI8125)
- Page 26 SCHEMATIC DIAGRAM-4 (FLASH)
- Page 27 SCHEMATIC DIAGRAM-5 (OUTPUT&POWER / KEY BOARD)
- Page 28 SCHEMATIC DIAGRAM-6 (POWER BOARD / INFRARED BOARD)
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Page 29: Exploded View
EXPLODED VIEW... -
Page 30: Parts List (Primary Parts)
AV baffl e(left) XI60923120 Back cabinet cover(left) XI10960120 Rotor cover XI6151058801 Holder assy * Only the parts in above list are used for repairing. * Other parts except the above parts can't be supplied. SANYO Electric Co., Ltd. Jul./’06 Osaka, Japan...