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XOCECO LC20Y19 Service Manual

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LCD TELEVISION
LC20Y19

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Summary of Contents for XOCECO LC20Y19

  • Page 1 LCD TELEVISION LC20Y19...

  • Page 2: Table Of Contents

    CONTENTS Safety instructions………………………………………………………………………..… Adjustment 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

    This service manual is only for service personnel to take reference with. Before Attention: 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.

  • 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.

  • Page 7: 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 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.

  • Page 9: 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 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. The click the item of Delays and Buffer Size: Set Long to 50000 ms.
  • Page 11 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.

  • Page 12: 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

    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...
  • Page 16 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 PCREC Reference voltage MUTE...
  • Page 17 5. Inner block diagram of TPA1517 6W stereo audio amplifier...
  • Page 18 6. 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 Resonator PBIAS Panel’s oblique line control...

  • Page 19: 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 20: Wiring Diagram

    Wiring diagram...

  • Page 21: 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 22 2. With picture and without sound when turning on: Increase 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 normal...
  • Page 23 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 N501 has wave Check whether N502 is damaged Replace N502 Check whether N505, D507 is...

  • Page 24: Exploded View

    E X P L O D E D V I E W...
  • Page 25 PART LIST OF EXPLODED VIEW DESCRIPTION PART# DECORATIVE BOARD 808-20359-212 PMMA PANEL 808-2A351-212 FRONT CABINET 780-P19W0-2C0Y DECORATIVE NET 864-10228-3C5 DEORATIVE NET FIXED 870-30206-00 BRACKET SIDE AV BRACKET 870-30209-120 BUTTON BAFFLE 808-6A927-3C0 DISPLAY 335-2000J-00 SCREEN(V201B1-L01) LCD FRAME ASSY 615-10534-00 MAIN BOARD 667-LPY19-01 AV BAFFLE(LEFT) 808-60921-120...

  • Page 26: Part List

    PART LIST PART# DESCRIPTION LOCA.NO. SL20Y190-02B10 SOFTWARE DDC N102 SL20Y190-10A10 SOFTWARE NEWPRIMA N400 100-L20Y190-10 LC-20Y19 100-L20Y190-02 LC-20Y19 26 335-2000J-00 DISPLAY SCREEN V201B1-L01 364-41207-00 ANTENNA SOCKET HR-F 488-10012-00 BATTERY 7# ENGLISH 491-552L0-02 POWER CORD UL X901 604-L20Y197-00 OWNER'S MANUAL(PRIMA MTS) 615-10534-00 LCD FRAME ASS'Y 655-44301-32 (4-PINS) LEAD WITH HOUSING...
  • Page 27 852-13006-81 SCREW P(+)M3X6-D.Zn 852-13006-81 SCREW P(+)M3X6-D.Zn 852-33006-87 SCREW B(+) M3X6-D.Zn ( BLACK ) 852-33006-87 SCREW B(+) M3X6-D.Zn ( BLACK ) 852-33008-87 SCREW B(+) M3X8-D.Zn ( BLACK ) 852-33008-87 SCREW B(+) M3X8-D.Zn ( BLACK ) 852-33008-87 SCREW B(+) M3X8-D.Zn ( BLACK ) 852-33008-87 SCREW B(+) M3X8-D.Zn ( BLACK ) 852-34010-87...
  • Page 28 820-20067-00 HOLDER BALANCE BOARD 851-43008-56 SCREW F(+)T3X8G-R 851-43008-56 SCREW F(+)T3X8G-R 851-53010-14 SCREW SJ2825 ST3X10C-Y 851-53010-14 SCREW SJ2825 ST3X10C-Y 852-34008-87 SCREW B(+) M4X8-D.Zn ( BLACK ) 852-34008-87 SCREW B(+) M4X8-D.Zn ( BLACK ) 852-44008-87 SCREW F(+)M4X8-D.Zn( BLACK ) 852-44008-87 SCREW F(+)M4X8-D.Zn( BLACK ) 868-20789-00 CUSHION 667-L20Y19-20...
  • Page 29 464-6F822-M0 ELECTROLYTIC CAPACITOR CD110-35V-2200uF-M C521 464-6F822-M0 ELECTROLYTIC CAPACITOR CD110-35V-2200uF-M C537 467-2G047-H0 METAL RESISTOR 2W-47Ω-JL R538 467-2G410-H0 METAL RESISTOR 2W-100K-JL R503 467-2G422-H0 METAL RESISTOR 2W-220K-JL R507 467-2GB15-H0 METAL RESISTOR 2W-0.15Ω-JL R504 467-4E010-H0 FUSIBLE RESISTOR 1/2W-10Ω-JL R509 467-8D582-H0 SOLID RESISTOR 1/4W-8.2MΩ-J R501 469-40004-00 THERMISTOR 5D2-14LC RT501...
  • Page 30 459-2410R-002 CERAMIC CAPACITOR DD308-63F104Z50 C526 459-2410R-002 CERAMIC CAPACITOR DD308-63F104Z50 C531 459-2410R-002 CERAMIC CAPACITOR DD308-63F104Z50 C532 459-2410R-002 CERAMIC CAPACITOR DD308-63F104Z50 C539 459-2410R-002 CERAMIC CAPACITOR DD308-63F104Z50 C542 462-00218-H02 POLYESTER CAPACITOR CL11-100V-1800PF-J C505 462-B0310-H02 POLYESTER CAPACITOR CL21X-50V-0.01uF-J C515 464-60547-M02 ELECTROLYTIC CAPACITOR CD110-50V-4.7uF-M C511 464-60622-M02 ELECTROLYTIC CAPACITOR CD110-50V-22uF-M C543...
  • Page 31 895-6020025-50 RIVET GB876-86-2X2.5-COPPER 895-6020025-50 RIVET GB876-86-2X2.5-COPPER 895-6020025-50 RIVET GB876-86-2X2.5-COPPER 895-6020025-50 RIVET GB876-86-2X2.5-COPPER 895-6020025-50 RIVET GB876-86-2X2.5-COPPER 895-6020025-50 RIVET GB876-86-2X2.5-COPPER 895-6020025-50 RIVET GB876-86-2X2.5-COPPER 895-6020025-50 RIVET GB876-86-2X2.5-COPPER 615-20539-00 SPEAKER ASS'Y 384-40908-Q0 SPEAKER ST511-06 655-4E302-112 (4-PINS) LEAD WITH HOUSING 851-53012-11 SCREW SJ2825 ST3X12C-D.Zn 868-20453-00 RUBBER WASHER 870-30085-00 SPEAKER BRACKET...
  • Page 32 353-05050-20 SMD IC PESD5V0L5UY N100 353-05050-20 SMD IC PESD5V0L5UY N103 353-05050-20 SMD IC PESD5V0L5UY N104 353-11170-G0 SMD IC AMS1117-1.8 (D) N302 353-15010-50 SMD ICAP1501-50K5 N703 353-15900-10 SMD ICR2S15900SP N203 353-24210-10 SMD IC 24LCS21A/SN N102 353-24320-50 SMD IC24LC32A/SN N300 353-29040-10 SMD IC MX29LV040QC-70 N400 353-72700-10 SMD IC LA72700V-N...
  • Page 33 455-12022-H0 SMD RESISTOR FTR0603220JR R337 455-12022-H0 SMD RESISTOR FTR0603220JR R338 455-12022-H0 SMD RESISTOR FTR0603220JR R340 455-12022-H0 SMD RESISTOR FTR0603220JR R341 455-12022-H0 SMD RESISTOR FTR0603220JR R342 455-12022-H0 SMD RESISTOR FTR0603220JR R343 455-12022-H0 SMD RESISTOR FTR0603220JR R344 455-12022-H0 SMD RESISTOR FTR0603220JR R352 455-12022-H0 SMD RESISTOR FTR0603220JR R353...
  • Page 34 455-12210-H0 SMD RESISTOR FTR0603102JR R270 455-12210-H0 SMD RESISTOR FTR0603102JR R296 455-12210-H0 SMD RESISTOR FTR0603102JR 455-12210-H0 SMD RESISTOR FTR0603102JR R356 455-12210-H0 SMD RESISTOR FTR0603102JR R704 455-12210-H0 SMD RESISTOR FTR0603102JR R717 455-12210-H0 SMD RESISTOR FTR0603102JR R724 455-12218-H0 SMD RESISTOR FTR0603182JR R330 455-12218-H0 SMD RESISTOR FTR0603182JR R331 455-12222-H0...
  • Page 35 455-12310-H0 SMD RESISTOR FTR0603103JR R232 455-12310-H0 SMD RESISTOR FTR0603103JR R249 455-12310-H0 SMD RESISTOR FTR0603103JR R251 455-12310-H0 SMD RESISTOR FTR0603103JR R257 455-12310-H0 SMD RESISTOR FTR0603103JR R258 455-12310-H0 SMD RESISTOR FTR0603103JR R259 455-12310-H0 SMD RESISTOR FTR0603103JR R271 455-12310-H0 SMD RESISTOR FTR0603103JR R288 455-12310-H0 SMD RESISTOR FTR0603103JR R407...
  • Page 36 456-2022H-11 SMD CAPACITOR 0603CG220J250BA C363 456-2118H-11 SMD CAPACITOR 0603CG181J250BA C231 456-2210K-B1 SMD CAPACITOR 06032R102K250BA C232 456-2310R-C1 SMD CAPACITOR 06032E103Z250BA C242 456-2310R-C1 SMD CAPACITOR 06032E103Z250BA C243 456-2310R-C1 SMD CAPACITOR 06032E103Z250BA C258 456-2310R-C1 SMD CAPACITOR 06032E103Z250BA C259 456-2310R-C1 SMD CAPACITOR 06032E103Z250BA C274 456-2310R-C1 SMD CAPACITOR 06032E103Z250BA C275...
  • Page 37 456-2410M-C1 SMD CAPACITOR 06032E104M250BA C311 456-2410M-C1 SMD CAPACITOR 06032E104M250BA C312 456-2410M-C1 SMD CAPACITOR 06032E104M250BA C317 456-2410M-C1 SMD CAPACITOR 06032E104M250BA C318 456-2410M-C1 SMD CAPACITOR 06032E104M250BA C319 456-2410M-C1 SMD CAPACITOR 06032E104M250BA C320 456-2410M-C1 SMD CAPACITOR 06032E104M250BA C322 456-2410M-C1 SMD CAPACITOR 06032E104M250BA C323 456-2410M-C1 SMD CAPACITOR 06032E104M250BA C324...
  • Page 38 456-2447R-C1 SMD CAPACITOR 06032E474Z250BA C246 456-2447R-C1 SMD CAPACITOR 06032E474Z250BA C247 456-2447R-C1 SMD CAPACITOR 06032E474Z250BA C248 456-2447R-C1 SMD CAPACITOR 06032E474Z250BA C260 456-2447R-C1 SMD CAPACITOR 06032E474Z250BA C261 456-2447R-C1 SMD CAPACITOR 06032E474Z250BA C262 456-2447R-C1 SMD CAPACITOR 06032E474Z250BA C263 456-2510R-C1 SMD CAPACITOR 06032E105Z250BA C228 456-3002C-11 SMD CAPACITOR 0603CG020C500BA C288...
  • Page 39 464-6C710-M02 ELECTROLYTIC CAPACITOR CD110-10V-100uF-M C716 464-6C722-M02 ELECTROLYTIC CAPACITOR CD110-10V-220uF-M C357 464-6D522-M02 ELECTROLYTIC CAPACITOR CD110-16V-2.2uF-M C218 464-6D522-M02 ELECTROLYTIC CAPACITOR CD110-16V-2.2uF-M C222 464-6D610-M02 ELECTROLYTIC CAPACITOR CD110-16V-10uF-M C216 464-6D610-M02 ELECTROLYTIC CAPACITOR CD110-16V-10uF-M C219 464-6D610-M02 ELECTROLYTIC CAPACITOR CD110-16V-10uF-M C277 464-6E547-M02 ELECTROLYTIC CAPACITOR CD110-25V-4.7uF-M C203 464-6E547-M02 ELECTROLYTIC CAPACITOR CD110-25V-4.7uF-M C205...
  • Page 40 667-LPY19-01U\ MAIN PCB ASS'Y (MANUAL INSERTION ) JUMPER WIRE D203 329-53601-00 CRYSTAL JA25A 3.579545MHZ G201 329-61901-00 CRYSTAL HC-49u 19.6608MHz G300 340-50950-00 ZENER DIODE HZ9C3 D701 343-01800-00 TRANSISTOR KSE180 TO-126 V705 352-05550-00 *IC LM555CN N206 352-05740-00 IC uPC574 N205 352-52760-10 IC M52760SP N204 364-11209-00 EARPHONE JACK CKX3-3.5-1...
  • Page 41 667-L20Y19-05A KEY BOARD ASS'Y 360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S901 360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S921 360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S922 360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S923 360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S924 360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S925 360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S926 364-34104-00 4-PINS CONNECTORS TJC3-04AWT X922 364-34186-00...
  • Page 42 301-Q20Y15-28MB RC-Q28M-0BREMOTE CONTROL UNIT (PRIMA NEW)

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