LG CM2520 Service Manual

Text of LG CM2520 User Guide:

• LG CM2520, HOW TO UPDATE MCS PROGRAM (1) Change the file name to download as “(MODEL NAME)__(function)_(Version).mcs”. ex) CM2520_XXXX_XX.mcs (2) Copy the file to the root folder of USB storage. (3) Put the USB into the set. Change set function to USB function. Then the upgrade process will be started with the upgrade intormation. FLD Display "UPGRADE". (4) If the upgrade process is complete, the set will be rebooted with “SUCCESS” message and set auto power off. (5) Pull out the USB Storage. Press the power key. 1-7 PROGRAM UPDATE GUIDE

• LG CM2520, +PVDD (20.5 V) Replace C918, C916, C902, C905, C917. Replace D913, D914. YES YES YES NO NO C918, C916, C902, C905, C917 normal? D913, D914 normal? Replace IC908, PC901. Replace ZD903, C923, Q907, D906, C909. YES YES NO IC908, PC901 normal? Is VCC (130V-340V) supplied to IC901 Pin1? Is VCC (9.5V-26V) supplied to IC901 Pin3? NO 3-3 ELECTRICAL TROUBLESHOOTING GUIDE

• LG CM2520, 4. FUNCTION MODE AUDIO ABNORMAL AUX abnormal Check the input signal of CON102 Pin6, 8. Check the input signal R317, R318. Check the input signal JK302 Pin2, 4. YES NO Check the input signal of IC700 Pin11, 4. YES NO NO Tuner abnormal Check C580,C581,R515,R516,R717,R718,C751,C753. Check the input signal of IC700 Pin12, 1. Normal.Check the VCC of power circuit. NO YES NO NO YES Check the output signal of TU400 Pin5, 6 to U401 Pin1, 2. Check TU400/ U401 Pin4 “Tun_SCLK”, Pin5 “Tun_SDIO”, Pin7 “Tun_RST”. YES YES Check VCC of TU400/ U401 Pin3? OK 3-6 ELECTRICAL TROUBLESHOOTING GUIDE

• 1. SMPS PART +3.3 VA Replace C912, IC907. Replace BD901. Replace IC902, PC901. Replace F901 (Use same type fuse). There is no power cord at the power jack. Replace C953, C926, ZD904, R907, D902. Replace FB904, T901. YES YES YES YES YES YES YES NO NO NO NO NO NO C912, IC903 normal? BD901 normal? IC909, PC902 normal? F901 normal? Replace D905, C916, C917. Replace RT901,

• LG CM2520, 3-41 3-42 3. DIODES 4. CAPACITORS 5. CONNECTORS NO Type Positive (+) Negative (-) Positive (+) Negative (-) SPEC 80 V / 60 Hz 288 V / 50 Hz D901 UF4007 117.6V 198.2V 390.4V 409.1V ≤1000V(Reverse) D902 FR107 0V 12.41V 0V 12.26V ≤1000V(Reverse) D905 UF4007 118.3V 192.4V 387.8V 494.5V ≤1000V(Reverse) D906 RF107 0V 12.73 0V 12.51V ≤1000V(Reverse) D907 FR107 0V 7.01V 0V 6.9V ≤1000V(Reverse) D908 SR360 0V 7.29V 0V 7.18V ≤60V(Reverse) D909 UF5404 0V 14.4V 0V 14.05V ≤200V(Reverse) D910 FR107 0V 3.23V 0V 3.3V ≤1000V(Reve

• LG CM2520, 3-35 3-36 8. DISPLAY CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R ST DISPLAY 2012. 02. 09 F+ F- 1.51V0.81V 1.02V 0.43V 0V KEY V6 2 .1V2 6 . 0 0.21V KEY BOARD TO:MAIN PCB VOL- VOL+ OPEN NEXT/UP BACK/DN STOP PLAY/PAUSE FUNCTION_ C305 0.1uF C0805 FB311 300RH R319 82K R0805 FB308 300RH FB307 300RH FB302 300RH FB314 300RH C309 101P FB313 300RH C320 0.1uF C0805 FB309 300RH R400 10K R0805 FB303 300RH FB301 300RH 16789011121234513 1 2 3 4 5 6 7 8 9 13 12 11 10 CON301 C303' 0.1uF C0805 FB310 300RH R306 100R R0805 R328 1R 0.5W R1206 FB304 30

• LG CM2520, NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. 2. Repair notes 1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials. 2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to t

• SECTION 1 SUMMARY CONTENTS SERVICING PRECAUTIONS ................................................................................................................... 1-3 ESD PRECAUTIONS .................................................................................................................................. 1-5 SERVICE INFORMATION FOR EEPROM .................................

• LG CM2520, POWER ON FLD Display "NO DISC" status Set Front ‘STOP’ Key + Remote control ‘FWD SKIP’ Key push same timing during 5s FLD ‘OPT-XXXX’ Press SET Front "Play" Key Move to appropriate position and make changes with Set Front ‘FWD SKIP’ Key Press Set Front ‘STOP’ Key + Remote control ‘FWD SKIP’ Key FLD Display ‘E2P CLR’ Press ‘POWER’ key Completed NAME OPT OPT OPT OPT OPT HEX 00000 (FM) 00001 (FM-NO IPOD) 01000 (FM_RDS) 10100 (FM_AM) D1000 (FM_DAB) DETECT NEW EE

• NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care. 2) The pick-up is composed

• LG CM2520, 5. CD PART Turn on CD Check IC107 Pin127. (Open 3.3 V, Close 0 V) Check the pick-up movement. Check IC801 Pin9,10 / IC107 Pin127. YES YES YES YES YES NO Check Open / Close. Check IC107 Pin127. (Open 3.3 V, Close 0 V) Check IC800 Pin31, 34, 35, 36, 37. Check connector CON801. NO NO NO NO NO Check "READING " display. If play, check audio output. Check Reading OK. OK 3-7 ELECTRICAL TROUBLESHOOTING GUIDE

• 9. IPOD PART Turn on IPOD Check the "High" DET of CON200 Pin1. Check JK200. Normal. Check IC703 Pin3(VCC). YES YES YES YES Check CON200 Pin3, 4 (RX, TX) signal. Check CON202 Pin1, 3 signal. Check CON200, IC101(Pin5, 76, 77) Check IC703 Pin8,14. YES YES YES NO NO NO NO NO NO Check display. Check reading OK. If play, check audio output. Check the IP +5 V, CON200 Pin7, 8

• LG CM2520, Micro Hi-Fi System SERVICE MANUAL MODEL: CM2520 (CM2520, CMS2520) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. MODEL: CM2520 (CM2520, CMS2520)SERVICE MANUAL P/NO : AFN75734072 APRIL, 2012 Website http://biz.lgservice.com Internal Use Only

• 8. LCD DISPLAY CHECK LCD abnormal Check SMPS part. Normal. YES NO NO Check R310 ~ R312. Check CON301 flat film wire. Check chip bead FB313. NO NO YES YES YES YES YES Check IC301 Pin1 “LCD-CS”,Pin3 “LCD-WR” Pin4 “LCD-DATA” signal. Check CON301 Pin4 “VFD_CLK”, Pin3 “VFD_DATA”, Pin2 “VFD_STB” signal. Check IC301 Pin7 VCC (3.3V). Check CON301

• LG CM2520, 3-21 3-22 CIRCUIT DIAGRAMS 1. SMPS CIRCUIT DIAGRAM IMPORTANT SAFETY NOTICE WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG CORPORATION. ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT. SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION. THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED. THIS WAY, IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATUR

• LG CM2520, 3-43 3-44 CONNECTORS Connector No. Pin NO. SPEC Value (V) Input Voltage: 240 V / 50 Hz Main CON101 1PIN IP-DET 0-3.3V 3.25 2PIN A_ACC 0-3.3V 0.01 3PIN IP-TX. 0-3.3V 0 4PIN IP-RX. 0-3.3V 0 5PIN D_ACC 0-3.3V 0 6PIN ACC_P 0-3.3V 0 7PIN GND 0V 0 8PIN +5V 5±0.15V 4.97 9PIN +5V 5±0.15V 4.97 10PIN ip_D- 0-3.3V 2.65 11PIN ip_D+ 0-3.3V 1.97 12PIN GND 0V 0 13PIN GND 0V 0 CON102 1PIN USB+5V 5±0.15V 4.97 2PIN DM+ 0-3.3V 0.01 3PIN DM- 0-3.3V 0.01 4PIN GND 0V 0 5PIN PORT_L 0-1.2V 1.06 6PIN GND 0V 0 7PIN PORT_R 0-1.2V 0.01 8PIN PORT_SENS 0-5V 3.19 CON103 1PIN PVDD 20±0.5V 18.6 2PIN PVDD 20±0.5V 18.6 3PIN PGND 0V 0 4PIN PGND 0V 0 5PIN +3.3V 3.

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LG CM2520 Owner's manual 30-01-2024 24

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