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Internal Use Only Website http://biz.lgservice.com DVD-VIDEO PLAYER SERVICE MANUAL MODEL: DP122 CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN75734177 NOVEMBER, 2012...
When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.
SERVICING PRECAUTIONS CAUTION: Before servicing the DVD covered by this service Electrostatically Sensitive (ES) Devices data and its supplements and addends, read and follow the Some semiconductor (solid state) devices can be damaged SAFETY PRECAUTIONS. NOTE: if unforeseen circumstanc- easily by static electricity. Such components commonly are es create conflict between the following servicing precautions called Electrostatically Sensitive (ES) Devices.
THE PROCESS OF DISC / USB DOWNLOAD METHOD 1. Please follow the below process to download a program with disc. 1) Turn on the DVD-player. (Note. Be sure that there is no disc in DVD-player) 2) Press “SETUP” button on Remote control. 3) Choose a “display”...
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7) Burn the changed file into disc. 8) Open tray, insert disc and close tray. 9) The below picture will appears on the screen. 10) Tray will open automatically. Take off the disc and press PLAY to upgrade. 11) After download process completed. DVD player will turn-off and turn on automatically. 12) Do it again the process 1, 2, 3, 4 to confirm the version.
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METHOD 2. Please follow the below process to download a program with USB. 1) Turn on the DVD-player. (Note. Be sure that there is no disc in DVD-player) 2) Press “SETUP” button on Remote control. 3) Choose a “display” menu by using the cursor button and then choose a “TV Aspect” menu. And choose “16:9” menu.
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7) Save or Copy the changed file into USB Flashdisk on root directory. 8) Make sure the isn’t anything inserted on the set and Plug in the USB Flashdisk. As the return icon displays, press the Return button on remote control. 9) The below picture will appears on the screen.
SPECIFICATIONS • GENERAL Power requirements AC 200 V ~ 240 V, 50/60 Hz Power consumption 11 W Dimensions (Approx.) 270 x 35 x 195mm (W x H x D) without foot Net Weight (Approx.) 1.4 kg Operating temperature: 5°C to 35°C Operating humidity 5% to 90% Laser...
ONE POINT REPAIR GUIDE 1. NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-1. Please check every output voltage. 1) Please check if output voltage 3.3 VA on MAIN board IC605 is normal. If output voltage 3.3 VA is not normal, please check the working status of SMPS board.
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ONE POINT REPAIR GUIDE NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-2. Please check MAIN board IC601 signal and its peripheral circuit. 1) Please check if output voltage 3.3 V from IC601 pin8, pin19, pin50, pin68, pin84 is normal. If output voltage 3.3 V is not normal, please check 3.3 VA power line of the MAIN board.
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ONE POINT REPAIR GUIDE NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-3. Please check MAIN board IC IC603 signal and its peripheral circuit. 1) Please check if output voltage 3.3 V from IC603 pin1, 3, 9, 14, 27, 43, 49 is normal. If output voltage 3.3 V is not normal, please check 3.3 V power circuit of MAIN board.
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ONE POINT REPAIR GUIDE NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-4. Please check MAIN board IC IC602 signal and its peripheral circuit. 1) Please check if output voltage 3.3 V from IC602 pin8 is normal. If output voltage 3.3 V is not normal, please check 3.3 V power circuit of MAIN board.
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ONE POINT REPAIR GUIDE NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-5. Please check MAIN board IC201 signal and its peripheral circuit. 1) Please check if output voltage 5 V from IC201 pin8, pin19 is normal. If output voltage 5 V is not normal, please check 5 V power circuit of MAIN board.
ONE POINT REPAIR GUIDE 2. NO VIDEO OUTPUT When you plug power cord and turn the unit on, LED will turn on, the unit will read disc normally, but it won’t have video output or component output. 2-1. Please check the solder joint status of MAIN board connector JK701. If JK701 has cold solder joint, JK701 pins should be oxidized, and please replace JK701.
ONE POINT REPAIR GUIDE 3. NO AUDIO OUTPUT When you plug power cord and turn the unit on, LED will turn on, the unit will read disc normally, but it won’t have audio output. 3-1. Please check the solder joint status of MAIN board connector JK701. If JK701 has cold solder joint, JK701 pins should be oxidized, and please replace JK701.
ELECTRICAL TROUBLESHOOTING GUIDE 1. SMPS TROUBLESHOOTING FLOW No 5 VA Replace the FR101 Is the FR101 normal? (Use the same ICW) Replace the Is the D105/D106/D107/ D105/D106/D107/D108 D108 normal? Is the Vcc (about 17V) Check or Replace the IC101 supplied to IC101 Pin2? Replace D123 Is the D123 normal? or check if any short circuits...
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ELECTRICAL TROUBLESHOOTING GUIDE No 14 VA Replace D125 Is the 14 VA or check if any short circuits on cathode of D125? Is the 5 VA Check 5 VA troubleshooting flow on cathode of D123? Check or replace transformer No 12 V Is the 14 VA supplied to Check 14 VA troubleshooting flow emitter of Q603...
ELECTRICAL TROUBLESHOOTING GUIDE 2. POWER CHECK FLOW No 3.3 VA Is the 5 VA on Check 5 VA troubleshooting flow pin3 of IC605? Is the 3.3 V on Check voltage reference pin1 of IC605 pin2 of IC605? Replace IC605 or check output circuits No 5 V Is the 5 VA on Check 5 VA troubleshooting flow...
ELECTRICAL TROUBLESHOOTING GUIDE 3. SYSTEM OPERATION FLOW Power on Show LOGO Tray closed? Tray close to closed position SLED at inner side? SLED moves to inner position 1. Judge whether have disc and disc type 2. Jump to related disc reading procedure Recieve OPEN/CLOSE Key? 1.
ELECTRICAL TROUBLESHOOTING GUIDE 4. SYSTEM TEST FLOW TEST Check the AC Replace power PCBA or AC transformer. Voltage Power PCBA (110V or 220V) Switch on the power PCBA Check DC output from SMPS Is the DC supply output OK? (3.3VA,5.3VA,12V) (5 VA and 12 VA) Make sure the main PCBA don't short on VCCs and switch it on.
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ELECTRICAL TROUBLESHOOTING GUIDE RESET or power on. Check connection line Flash between Flash & Mpeg and memory operates Show LOGO? the Flash access time properly? whether is suitable or not Check connection RAM address and RAM SDRAM data between SDRAM & Mpeg and check if works properly? the SDRAM is damage Is the Mpeg...
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ELECTRICAL TROUBLESHOOTING GUIDE Does Is STBY Check STBY connection the SLED move pin of Motor IC between MPEG to inner side when it is is High? and Motor driver IC at outter position? Check DMSO connection Is DMSO between MPEG pin level higher than and Motor driver IC 1.65V?
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ELECTRICAL TROUBLESHOOTING GUIDE Laser DVD_LD, Check the Laser power circuits turns on when on Mpeg IC and connection to CD_LD output reading disc? power transistor properly? Collector voltage Check the related circuit on of power transistor laser power transistor is OK? Check cable connection between transistor ouput and pick-up head.
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ELECTRICAL TROUBLESHOOTING GUIDE Check RF connections Is RF between MPEG signal A,B,C,D,of MPEG IC Focus on OK? and Pick up head properly? Check FOSO connection Is the between MPEG FOSO signal on MPEG IC and Motor driver IC properly? Is F+ Check the focus control &...
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ELECTRICAL TROUBLESHOOTING GUIDE Normal Audio Check connection between Audio output when AMP received correct MPEG and Audio AMP disc playback? data stream? Check the related Normal Audio AMP out? circuit of Audio AMP. Check 12V power supply Check Audio filter, from SMPS board amplify, mute circuit.
DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK, RESET, FLASH R/W SIGNAL 1) MT1389V main clock is at 27MHz (X601) FIG 1-1 2) MT1389V reset is active high. 3.3VA PWR_CTL RESET FIG 1-2 3-19...
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3) RS232 waveform during procedure (Downloading) FIG 1-3 4) Flash CE# enable signal and SCK signal during Downloading FIG 1-4 3-20...
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) SLD_PWM(1.9V/1.4V/1.1V) DR_MUTE(3.3V) FAN_SLD+(4.2V/2.8V/1.2V) FAN_SLD-(4.2V/2.8V/1.5V) FIG 4-1 5. LENS CONTROL RELATED SIGNAL (NO DISC CONDITION) FOD(1.8V/1.65V/1.5V) FCS+(3.5V/2.8V/2.0V) FCS-(3.3V/2.7V/1.5V) FIG 5-1 3-22...
6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) MDI1(0V/180mV) DVD_LD(3.3V/2.3V) CN201 CD_LD(3.3V/2.3V) FIG 6-1 7. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) SPD_PWM(1.65V/0.3V) FAN_SPN-(4.5V/2.8V) FAN_SPN+(1V/2.8V) FIG 7-1 3-23...
DESIGN BE MODIFIED OR ALTERED WITHOUT DIFFER FROM THE ACTUAL CIRCUIT USED. THIS 2. Voltages are DC-measured with a digital voltmeter PERMISSION FROM THE LG CORPORATION. ALL WAY, IMPLEMENTATION OF THE LATEST SAFETY during Play mode. COMPONENTS SHOULD BE REPLACED ONLY WITH...
2. SMPS & KEY / LED P.C.BOARD (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-49 3-50...
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SECTION 4 MECHANISM (DP-15) CONTENTS DECK MECHANISM PARTS LOCATIONS • Top View ............................. 4-2 • Top View(without Tray Disc) ....................4-2 • Bottom View ..........................4-2 DECK MECHANISM DISASSEMBLY 1. Main Base ............................4-3 1-1. Clamp Assembly Disc ......................4-3 1-1-1. Plate Clamp ......................4-3 1-1-2.
DECK MECHANISM DISASSEMBLY MAIN BASE TRAY DISC DISC CLAMP ASSEMBLY PLATE CLAMP MAGNET CLAMP CLAMP UPPER (Fig. A) BASE MAIN HOLDER LEVER BASE MAIN BASE MAIN BOTTOM SIDE VIEW FIG. 4-1 FIG. 4-2 1. MAIN BASE (FIG. 4-1) 2. TRAY DISC (FIG. 4-2) 1-1.
RUBBER DAMPER Distinguish upper and lower sides (Assemble with care) (S2) RUBBER DAMPER (S2) RUBBER DAMPER (S2) Distinguish upper and lower sides (Assemble with care) BASE PU (S2) GENERAL PICK UP ASSEMBLY GEAR RACK SPINDLE MOTOR ASSEMBLY FIG. 4-3 3. BASE ASSEMBLY SLED (FIG. 4-3) 3-3.