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Table of Contents
Troubleshooting
Related Manuals for XOCECO LC-15H3
Summary of Contents for XOCECO LC-15H3
- Page 1 COLOR TELEVISION LC-15H3...
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Page 2: Table Of Contents
CONTENT Safety instructions………………………………………………………………………..… Instructions on adjusting and testing…………………………….…….………………… Trouble shooting……………………………………………………….…………………… Method of software upgrading………………………………………….………………… Brief introduction and working principle of L15H3………………………………..…………. Wiring diagram……………………………………………………………..……………..Serial NO. of parts……………………………………………………………………….… Identification criteria for the bright spot and dark spot of the LCD screen………..…. Troubleshooting guide………………………………………………………………..……... -
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 or 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: Instructions On Adjusting And Testing
breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling. 2.12. For the storage make sure to put it in a place where the environment can be controlled so as to prevent the temperature and humidity from exceeding the limits as specified in the manual. - Page 5 Adjust TV board Check main board Check TV board Combined test for general assembly Connect to central signal source satellite signal, check if various TV functions (station skipping, modulate quantity control etc), check if the output of earphone and speaker are normal Input AV/S terminal signal, check different functions of AV/S terminals Input VGA signal and check if display is normal in...
- Page 6 5. Adjustment for the TV board Connect the main board and infrared receiving board (as per wiring diagram 203-L15H30-01JL) and press the POWER key on the remote control set. Now the indication lamp of the infrared receiving board is blue or yellow. Measure N301 PIN2 of TV board to be 3.3 V, one terminal of inductor L630 to be 5 V and one terminal of inductor L632 to be 12 V 6.Adjustment of white balance (using the white balancer CA210 and K7253 signal generator specialized for LCD)
- Page 7 Check if fine tuning is normal. Check if the output of earphone or loudspeaker is normal and if the picture is normal. b).Interface of AV/S Terminals Connect to access the signal of AV/S terminals separately and check if the picture or sound is normal.
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Page 8: Trouble Shooting
separately and check if the picture and sound is normal. 8.Preset ex-works In the status of TV enter the factory menu by pushing the factory key and then perform presetting. 9.Ex-works packing Check accessories and then pack them in box. Trouble shooting Before servicing please check to find the possible causes of the troubles according to the table below. - Page 9 2.TV set: Symptoms Possible cause 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.
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Page 10: 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 11: Brief Introduction And Working Principle Of L15H3
Target After Download. Click FLASH pushbutton, it’s ready to run. For other settings, please refer to the Fig. Above (already defaulted by the system, normally no need to change). 4.Switch on TV set the FLASH write program begins to run; 5.After FLASH write is over, push button “cancel”... - Page 12 BLOCK DIAGRAM...
- Page 13 IC BLOCK BA7657F / BA7657S Red 1 input HD 1 input HD Sync signal detector HD 2 input Green 1 input HD output Ground Red output Blue 1 input Ground Green output Red 2 input Composite video input (Sync on Green) Syncsepa Ground Composite sync output...
- Page 16 PW130...
- Page 20 TDA4470 Block Diagram Ï Ï L’ switch Loop Offset Ï Ï filter comp. (optional) Ï Ï Ï Ï Ï Ï Ï Control FPLL phase shift Ï Ï Ï switch Ï Ï Ï Ï Ï VIF amp Ï Video Ï Ï Ï...
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Page 21: Wiring Diagram
back IR BOARD KEY BOARD back TO LCD PANEL TO LCD PANEL 30ps X701 CNB1 CNB2 DIGITAL BOARD ANALOG BOARD X204 HIGH VOLTAGE VCT3803 X601 TUNER1 PW1306 X614 X603 5ps X602 back or front X102 X501 X603 MSP3420 X605 X602 X203 HIGH VOLTAGE... -
Page 22: Serial No. Of Parts
Serial No. of Parts 15" 17" 20" Sell area America America Europe America LCD panel Samsung Samsung Chimei 335-15012-00 335-17050-00 335-2000F-00 Back light board 667-L15H3-14 667-L17H3-14 667-L20H3-14A High frequency board 667-L15H3S-55 667-L15H3-55 667-L20H3-55 Main board 667-L15H3-01 667-L17H3-01 667-L20H3-01 adapter 302-L1510-02 302-AD16A-02 302-AD16A-02 antetype... -
Page 23: Troubleshooting Guide
Troubleshooting guide No raster Does the logo appear on the screen Check whether the adapter Check whether X101 is when turning on the set ? supply 12V power to Digital Board. properly inserted. Good Check whether there is R.G.B Check U125965V. Check whether FUSE is melted. - Page 24 TV board troubleshooting No picture but have raster. Measure the waveform of R.G.B Hors, Vers at X7. Check whether N1 has Check whether X9 pin 1, pin 2 have 5V power supply. 5V power input. Measure N1 pin 33, pin 35 Replace N2 Replace N1 waveform.