LG 22LF4520 Service Manual Download Page 14 | Manualshive

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LGE Internal Use Only

Copyright ©

LG Electronics. Inc. All right reserved.

Only for training and service purposes

2. No Picture

Replace Cable

N

Module Back Light On?

Check IC700 & Q700

Replace LED Driver IC or FET

Y

N

N

Check Panel Power 5V (P402 #01)

Check IC503 Output 5V

Replace IC503 &

Recheck

Y

N

Check Panel input Clock

P402 (#10, #11, #22, #23 )

Check IC300

Repair Main B/D

Y

N

Check FFC Cable for Damage or

Open Conductors

Check LED Driver Output

(C706)

Replace T-Con Board or Module

Y

Check IC300

Replace Main SOC

N

Check WLED_ENABLE High?

Y

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Summary of Contents for 22LF4520

Page 1: ...p eic lgservice com Asia Oceania http biz lgservice com Internal Use Only Printed in Korea P NO CHASSIS MODEL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL SERVICE MANUAL MFL68920123 1501 REV00 22LF4520 22LF4520 PU LU50A LED TV ...

Page 2: ...c All right reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 13 BLOCK DIAGRAM 17 EXPLODED VIEW 18 SCHEMATIC CIRCUIT DIAGRAM APPENDIX ...

Page 3: ... Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed metallic parts such as antenna terminals phone jacks etc If the exposed metallic part has a return path to the chassis the ...

Page 4: ...n your body by touching a known earth ground Alternatively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent potential shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent electrostatic charge b...

Page 5: ...e solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replaced...

Page 6: ...with BOM 5 The receiver must be operated for about 5 minutes prior to the adjustment 3 Test method 1 Performance LGE TV test method followed 2 Demanded other specification Safety UL EMI FCC NOTE Specifications and others are subject to change without notice for improvement 4 General specification 4 1 TV 4 2 Feature and Function No Item Specification Remarks 1 Market MEXICO 2 Available Channel 1 Di...

Page 7: ...3 981 60 020 108 000 13 1280 1024 79 976 75 025 135 000 14 1400 1050 65 317 59 978 121 750 15 1440 900 55 935 59 887 106 500 16 1600 900 60 000 60 000 108 000 17 1680 1050 64 674 59 883 119 000 18 1680 1050 65 290 59 954 146 250 19 1920 1080 67 500 60 000 148 500 HDMI DTV No Resolution H freq kHz V freq Hz Pixel clock MHz Remark 1 720 480 31 469 31 5 59 94 60 27 00 27 03 SDTV 480P 2 720 576 31 25 ...

Page 8: ...nent No Specification Remark Resolution H freq kHz V freq Hz 1 720x480 15 73 59 84 720x480i 2 15 73 60 3 720x480 31 47 59 84 720x480p 4 31 5 60 5 1280x720 44 96 59 84 1280x720p 6 45 60 7 1920x1080 33 72 59 84 1920x1080i 8 33 75 60 9 26 97 23 976 1920x1080p 10 27 24 11 33 71 29 97 12 33 75 30 13 67 432 59 84 14 67 5 60 ...

Page 9: ...k Connect tab If display Can t Check connect computer jig and set When you use JIG for checking and download Connect D SUB cable D SUB jack for RS232 Refer to 12page 4 Click Read tab and then load download file XXXX bin by clicking Read 5 Click Auto tab and set as below 6 Click Run 7 After downloading check OK message USB DOWNLOAD 1 Make New folder named LG_DTV and put ISP file bin in the folder 2...

Page 10: ...ad A E 00 10 Automatically download The use of a internal Data 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 0 FF FF FF FF FF FF 0 1E 6D C6 59 1 1 1 1 10 1 19 1 3 80 33 1D 78 EA 62 75 A3 55 4F A0 27 20 12 50 54 A5 6F 0 71 4F 81 C0 81 0 81 80 95 0 30 90 40 A9 C0 B3 0 2 3A 80 18 71 38 2D 40 58 2C 40 45 0 FD 1E 11 0 0 1A 21 39 90 30 62 1A 27 40 50 68 B0 36 0 FD 1E 11 0 0 1C 0 0 0 FD 0 38 60 4B 1E 53 0F 0 0A 20 2...

Page 11: ...INSTOP KEY after completion if the function inspection 4 4 White balance adjustment Equipment 1 Color Analyzer CA 210 LED Module CH 14 2 Adj Computer During auto adj RS 232C protocol is needed 3 Adjust Remocon RGB_Gains are fixed data for each model Insert RS 232C Jack which is connected with PC for White Balance or equivalent device Total Assembly line should be check whether the color coordinate...

Page 12: ...anual W B process using adjusts Remote control 1 After enter Service Mode by pushing ADJ key 2 Enter White Balance by pushing key at White Bal ance When doing Adjustment Please make circumstance as below 4 5 Model Name SW Version Adjust check Press the Instart key of ADJ remote controller 4 5 1 Model Name SW Version Check 1 Check Model Name 2 Check S W Version Refer to the IC Ver in the BOM 4 5 2 ...

Page 13: ...ower Replace X300 N Check C500 Voltage Level 19V Check Power connector OK Replace Adapter Y N Y Check IC501 Output Voltage Level 3 3V Replace IC501 Recheck Y N Check X300 Clock 24MHz Replace IC405 Flash Memory Y Check IC503 Output Voltage Level 5V Replace IC503 Recheck Y N Check IC502 Output Voltage Level 1 15V Replace IC502 Recheck N Y ...

Page 14: ...Check IC700 Q700 Replace LED Driver IC or FET Y N N Check Panel Power 5V P402 01 Check IC503 Output 5V Replace IC503 Recheck Y N Check Panel input Clock P402 10 11 22 23 Check IC300 Repair Main B D Y N Check FFC Cable for Damage or Open Conductors Check LED Driver Output C706 Replace T Con Board or Module Y Check IC300 Replace Main SOC N Check WLED_ENABLE High Y ...

Page 15: ...c All right reserved Only for training and service purposes 3 No Video Digital TV Check RF Cable Y 1 Check RF IC L200 Power 3 3V 2 Check IC501 Output voltage 3 3V Replace IC501 Recheck Y N Check SCL SDA Line TU200 3 4 Replace TU200 or IC300 Main Scaler N ...

Page 16: ...or training and service purposes 4 No Video HDMI Replace Main Scaler IC300 Check input signal format Is it supported Check JK100 for proper connection or Damage Replace Connector Y N Check I2C Signal JK100 Re Download EDID Data Y N Y Check HDMI Cable for Damage or Open Connector Y ...

Page 17: ... 17 LGE Internal Use Only Copyright LG Electronics Inc All right reserved Only for training and service purposes BLOCK DIAGRAM ...

Page 18: ...lated characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE 300 200 120 900 540 910 810 LV1 A2 535 820 800 400 ...

Page 19: ... 3 3V_ST JP124 VA114 20V DSUB_HSYNC 2 E18 JP119 DSUB_DET VA117 5 5V R144 75 DSUB_B DSUB_VSYNC 2 E18 JP122 R145 75 D103 MMBD6100 A2 C A1 DSUB_R JP125 VA119 20V R148 75 DSUB_G JP121 VA120 20V JK105 SPG09 DB 010 1 RED 2 GREEN 3 BLUE 4 GND_1 5 DDC_GND 6 RED_GND 7 GREEN_GND 8 BLUE_GND 9 NC 10 SYNC_GND 11 GND_2 12 DDC_DATA 13 H_SYNC 14 V_SYNC 15 DDC_CLOCK 16 SHILED Q103 MMBT3904 NXP E B C VA121 20V VA11...

Page 20: ... 0 1uF 16V C211 100pF 50V C207 0 1uF 16V C209 20pF 50V OPT TU_SDA C206 18pF 50V C214 100uF 16V 105C OPT 3 3V_TU IF_AGC DIF_P TU200 TDSS H701F 5 B1 3 3V 11 DIF N 2 NC_2 10 DIF P 4 SDA 1 NC_1 9 IF_AGC 8 NC_5 3 SCL 7 NC_4 6 NC_3 12 SHIELD A1 A1 B1 B1 R206 1K AR200 33 AR201 33 Tuner block 2 M1L 7 2013 07 13 TUNER 60mA 1 should be guarded by ground 2 No via on both of them 3 Signal Width 12mils Signal ...

Page 21: ...P_SCL P_AMP_SDA POWER_ON OFF1 DISP_EN R316 100 R317 22 LED_RED AMP_RESET_N I2C_SDA I2C_SCL AMP_MUTE AV_DET 1 15V_VDDC MODEL_OPT C311 0 1uF 16V C309 10uF 10V 1 8V_DDR 1 8V_DDR 3 3V_ST 3 3V_ST 3 3V_ST 3 3V_ST C335 0 1uF 16V 3 3V_ST AR302 33 AR332 4 7K AR305 10K AR308 4 7K AR309 4 7K R300 33 R302 33 R306 33 R308 33 R309 33 R311 33 R312 33 R315 33 IC301 MSD8222LUM 1 RX2N_B 2 RX2P_B 3 AVDD_MOD_1 4 RXCN...

Page 22: ... 1uF 16V RXA3 RXB1 RXA3 RXB0 RXB2 RXA0 RXA2 5V_PANEL_POWER RXB1 RXACK RXA0 RXACK 12V_PANEL_POWER P401 10031HR 30 HD_Panel 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 R416 0 Non CMI 29 R415 5 6K R418 4 7K OPT RXBCK RXB3 R419 5 6K RXA0 R420 100 OPT RXA1 JP413 RXA2 RXA3 R414 5 6K RXA3 JP412 RXA1 RXB0 R421 5 6K 3 3V 3 3V_ST 3 3V_ST D410 30V CDS3C30GTH D411 30V C...

Page 23: ...105C 12V_Normal POWER_ON OFF1 L501 10uH R537 10K C504 2 2uF 25V HD 12V Panel C520 0 1uF 16V C501 10uF 25V OPT R519 33K R506 68 C531 10uF 10V R521 100K 1 HD 12V Panel 3 3V_ST R505 68 HD 12V Panel C510 0 47uF 16V OPT R518 33K PANEL_CTL 12V_Normal C519 0 1uF 16V C530 0 1uF 16V C518 0 1uF 16V R525 10K 1 R549 10K R559 1K 1 8V_DDR 3 3V R551 0 FHD_Panel R550 0 HD_Panel R541 0 HD_Panel R539 0 FHD_Panel Q5...

Page 24: ...OPT E B C 19V C628 47uF 25V 105C OPT SB_MUTE R615 12K OPT D601 KDS226 OPT A AC C R614 12K OPT AMP_MUTE R612 47K OPT C613 100uF 25V 105C OPT C614 100uF 25V 105C OPT C608 10uF 10V 0 33uF C622 50V 0 33uF C623 50V 0 33uF C624 50V 0 33uF C621 50V IC600 BM28720MUV 1 ADDR 3 LRCK 7 REG15 9 TEST2 10 DVDD 11 TEST3 12 STADAO 13 ERROR 14 NC_1 15 BSP2N 16 OUT2N 17 VCCP2 18 GNDP2 19 BSP2P 20 OUT2P 21 OUT1N 22 B...

Page 25: ... R726 0 LED_CH1 R716 1 5K 1 R713 220K 1 L700 33uH BLU_CURRENT_CTL 19V R705 100 R708 0 LGD FHD NEW 23 6 R709 0 LGD FHD NEW 23 6 R710 0 LGD FHD NEW 23 6 R712 0 LGD FHD NEW 23 6 Vout Vout CH1 CH2 CH3 CH4 CH3 CH1 CH4 CH2 D701 100V BR210 C706 33uF 100V 55TO 105C R1001 0 NEW 23 6 R1002 0 NEW 23 6 R1003 0 NEW 23 6 R1006 0 NOT23 6 R1007 0 NEW 23 6 R1010 0 NOT23 6 P702 12507WR 06L LED WAFER_LEFT 1 2 3 4 5 ...

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