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Troubleshooting
Related Manuals for XOCECO LC-20Y15
Summary of Contents for XOCECO LC-20Y15
- Page 1 LCD TELEVISION LC-Y# LC-15Y3 LC-20Y15...
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Page 2: Table Of Contents
Method of software upgrading ………………………………………….…….…………… LC-Y# series working principle analysis……………………………….………….…………. Block diagram…………………………………..………………………………..………… IC block diagram………………………………………………………………………..…… Main assembly……………………………………………………………………………..… Identification criteria for the bright spot and dark spot of the LCD screen………..…. Wiring diagram ……………………………………………………………..……………... Troubleshooting charts………………………………………………………………..…… LC-15Y3 Schematic diagram ……………………………………………………………….….. LC-20Y15 Schematic diagram ………………………………………………………….….. -
Page 3: 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 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: Adjustment 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 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
Table 1 Display Format of PC Item Picture element clock H-SYNC V-SYNC Resolution Remark (MHz) (kHz) (Hz) 640 x 480 @ 60 25.175 31.469 59.900 800 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... - Page 8 Unable to switch the power on Check to see if the power plug has been inserted properly into the socket. No picture and sound Check to see if the power supply of liquid crystal TV has been switched on. ( as can be indicated by the 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...
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Page 9: Method Of Software Upgrading
Blur picture Check if the antenna cable is correctly connected. Of if it has received the right video signal. No sound Check if the “mute” audio frequency setting is selected. Check if the sound volume is set to minimum. Make sure the earphone is not connected. Check if the cable connection is loose. - Page 10 Properly set the path of RAMWrite "C:\isp_fastflash\Isp_parallel\TEMP_OBJECT\isptemp_ parallel.hex" and FastFlashWrite "C:\isp_fastflash\20y25.hex", save them and close. 4. Set the LCD to off. Connect the Y# updating board and PC with parallel cable. 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.
- Page 11 Click the item of Parallel: Set Clock to 120000 Hz. 8. Click Batch, 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.
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Page 12: Lc-Y# Series Working Principle Analysis
LC-Y# series 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
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 VIDEO OUT... - Page 15 2. Inner block diagram of LA72700 stereo decoder Descriptions of the pins: Pin name Connections Pin name Connections PCSTFILT VCO PLL filter IIC data input PCPLDET Driving level test IIC clock input PISIF SIF signal test PCALCFIL ALC filter 25/26 R/L OUT TVF_R/L output SIF DEMOD SIF demodulator...
- Page 16 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 4. Inner block diagram of AN5277 audio amplifier with single end and double channels...
- Page 17 5. Inner block diagram of TPA1517 6W stereo audio amplifier 6. Inner block diagram of FLI8125 digital video processing IC...
- Page 18 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 Resonator PBIAS Panel’s oblique line control output TCLK Basic clock PPWR Backlight adjustment SCL_RS232...
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Page 19: Main Assembly
Main assembly LC-15Y3 LC-20Y15 hanging assy 535-L20H15-00 stand 615-10435-00 615-10483-03 (DZ-0615) (DZ-2020) Speaker assy 615-20448-00 Main board 667-L15Y3-01 667-LPY25-01 Power board 667-L15Y3-20 667-L20Y15-20 receiving 667-L15Y3-09 667-L20Y15-09 board Button board 667-L15Y3-05 667-L20Y15-05 Back light 667-L15H3-14C 667-L20H3-14A board panel 335-15118-00 (M15X3-L04) 335-2000F-00 (V201V1-T01) Identification criteria for the bright spot and dark spot of the LCD screen Q’ty allowed... -
Page 20: Wiring Diagram
Wiring diagram... -
Page 21: Troubleshooting Charts
ENABLE, PWM refers mainboard to backlight brightness control signal.) LC-20Y25 AN5277, locates on X702 1, 2: +12V 3, 4: GND 5: +3.4V LC-20Y15 power board, Vcc=18V 8 pin 6: GND; 7: PBIAS 8: PWM LC-15Y3 TPA1517, locates on... - Page 22 2. With picture and without sound when turning on: Check if the no sound channel from the Increase volume; signal input to sound processing IC check whether every 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 normal...
- Page 23 5. Check flow of the power board: Replace the fuse and check Power board damages Replace N501, D501 whether N901, D501 or fuse blows breakdown Check whether C512 has 18V Replace D502 Check whether pin1 of N501 has wave Check whether N502 is damaged Replace N502 Check whether N505, D507 is Check whether N505 is...
- Page 35 LCD-S.M-LC-Y#(L15Y3 and L20Y15) Ver.1.0...
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