LG 50PX4RA Service Manual

Chassis: mf-056a

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PLASMA TV

SERVICE MANUAL

CHASSIS : MF-056A

MODEL : 50PX4RA

CAUTION

BEFORE SERVICING THE CHASSIS,

READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

50PX4RA-TA

website:http://biz.LGservice.com

e-mail:http://www.LGEservice.com/techsup.html

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Page 1 PLASMA TV SERVICE MANUAL CHASSIS : MF-056A MODEL : 50PX4RA 50PX4RA-TA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
Page 2: Table Of Contents
CONTENTS SAFETY PRECAUTIONS ..................3 DESCRIPTION OF CONTROLS ................4 SPECIFICATIONS ....................8 ADJUSTMENT INSTRUCTIONS ...............10 TROUBLE SHOOTING GUIDE ................14 BLOCK DIAGRAM .....................23 EXPLODED VIEW ....................24 EXPLODED VIEW PARTS LIST ................25 REPLACEMENT PARTS LIST................26 SCHEMATIC DIAGRAM..................PRINTED CIRCUIT BOARD .................. - 2 -...
Page 3: Safety Precautions
SAFETY PRECAUTIONS IMPORT ANT SAFETY NOTICE General Guidance isolation Transformer should always used AC Volt-meter Good Earth Ground such as WATER PIPE, CONDUIT etc. To Instrument's 0.15uF exposed METALLIC PARTS 1.5 Kohm/10W - 3 -...
Page 4: Description Of Controls
These buttons are used for teletext. gramme. For further details, see the ‘Teletext’ section. Note : In teletext mode, the PIP PR +/-, VCR BUTTONS SWAP and PIP INPUT buttons are used for Controls a LG video cassette recorder. teletext function. - 4 -...
Page 5 <Front Panel Controls> TV/AV MENU INPUT MENU 1. Power Button (Programme Up/Down) Switches the set on from standby or off to standby. Selects a programme or a menu item. Switches the set on from standby. 2. Remote Control Sensor (Volume Up/Down) Adjusts the volume.
Page 6 <Back Panel> A/V INPUT2 A/V INPUT2 S-VIDEO VIDEO VIDEO AUDIO AUDIO VIDEO VIDEO AUDIO AUDIO AC INPUT Antenna HDMI/ COMPONENT COMPONENT INPUT INPUT 2 2 MONIT MONITOR OUTPUT OR OUTPUT RGB INPUT AUDIO INPUT DVI(VIDEO) AUDIO AUDIO V V ARIABLE ARIABLE AUDIO OUT AUDIO OUT REMOTE...
Page 7 Accessories Accessories TV/AV MULTIMEDIA POWER MODE CABLE FAVOURITE Q.VIEW SIZE POSITION INDEX HOLD TIME REVEAL MODE Remote Control handset Owner’s Manual 2-Eye Bolts 1.5V Power Cord Alkaline batteries 2-Wall brackets Joinning the TV assembly to the wall to protect the set tumbling - Secure the TV assembly by joinning it to a wall by using the Eye Bolts/Wall brackets.
Page 8: Specifications
1) Performance : LGE TV test method followed. 2) Demanded other specification Safety: CE, IEC specification EMC : CE, IEC Model Name Market Remark 50PX4RA-TA Non-EU Safety : IEC60065, EMI : CISPRI3 General Specification 1. General Specification Item Specification Remark...
Page 9 2. Model Specification 2.1. 42PX4RV-TA Item Specification Remark Market Non-EU Broadcasting system PAL B/G/I/D/K, NTSC Available Channel BAND NTSC VHF/UHF C1~C69 2~83 CATV S1~S47 1~71 Receiving system Upper Heterodyne Video Input (2EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC,PAL60 Video Output(1EA) PAL, SECAM, NTSC 4 System : PAL, SECAM, NTSC,PAL60...
Page 10: Adjustment Instructions
ADJUSTMENT INSTRUCTIONS 1. Application Object 3-2. Channel memory Method 1) Select “PDP” and “Hurricane” on Model dialog. And check These instructions apply to the MF-056A Chassis. your connection in Communication dialog. (If your connection is ‘NG’, then set your PORT(COM1,2,3,...) 2.
Page 11 2) Connect RS-232C cable and turn on the power. (Use the 5. EDID (The Extended Display special Cable For Sub-program) (If your connection has Identification Data)/ DDC (Display completed, you can see “Ready”) Data Channel) download 5-1. Required Test Equipment 1) Adjusting PC with S/W for writing EDID Data.(S/W : EDID TESTER Ver.2.5) 2) A Jig for EDID Download...
Page 12 6. Auto AV(CVBS) Color Balance Type MF-056A Baud Rate Data bit Stop bit Parity 6-1. Required - This AV color balance adjustment should be performed befor 115200 NONE white Balance Adjustment Index Cmd1 Cmd2 Data Min Value Max Value 6-2. Required Equipment R Gain 00(00) 255(FF)
Page 13 8. Auto Component Color Balance 9. Default Value in Adjustment mode 8-1. Required Test Equipment 9-1. Auto Color Balance (Component/RGB) 1) Remote controller for adjustment 2) 802F Pattern Generator Auto Color Balance(HEX) (Which has 720p Ypbpr output & PC 1024x768 60Hz with Standard(0.7Vpp) Vertical 100% Color Bar Pattern as Fig.8) Auto-RGB To Set...
Page 14: Trouble Shooting Guide
TROUBLE SHOOTING GUIDE 1. Power Board 1-1. The whole flowchart which it follows in voltage output state Start check Is it identical Doesn't the Is the Interface screen whole come with Power Off signal operated? out? condition? 1. Check the Power Off 2.
Page 15 1-2. Sony Power Board Structure T502: Vs Trans T702: Va Trans T101: St-by Trans T103: Low Voltage Trans - 15 -...
Page 16 1-3. Sanken, LGIT Power Board Structure T221: Vs Trans T271: Va Trans T121: St-by Trans T201: Low Voltage Trans - 16 -...
Page 17 2. No Power (1) Symptom Does’t minute discharge at module. ﬂ Non does not come in into the front LED. ﬂ (2) Check following Is plug in power cord? Plug in power cord. Is the Line Filter and Power Connect the Cable. Board Cable connected? Is the Fuse(F101) on Replace the Fuse.
Page 18 3. Protect Mode (1) Symptom After once shining, it does not discharge minutely ﬂ from module The Rely falls(The sound is audible “click”) ﬂ It is converted with the color where the front LED ﬂ is red from green. (2) Check following Is the Power Board Is output the normality Low/High Replace Power...
Page 19 4. No Raster (1) Symptom Does’t minute discharge at module. ﬂ It maintains the condition where the front LED is green. ﬂ (2) Check following Is the Power Board Is output the normality Low/High Replace the normal? voltage except Stand-by 5V? Power Board.
Page 20 5. In case of occurring strange screen into specific mode 5-1. In case the OSD does not displayed (1) Symptom LED is green ﬂ The minute discharged continuously becomes ﬂ accomplished from module (2) Check following Is the LVDS cable Is the LVDS cable Replace the cable.
Page 21 5-2. In case of does’t display the screen into specific mode (1) Symptom The screen does not become the display from specific input mode ﬂ (RF, AV, Component, RGB, DVI). (2) Check following Check the all input mode should become normality display. ﬂ...
Page 22 6. In case of no sound (1) Symptom LED is green ﬂ Screen display but sound is not output ﬂ (2) Check following Is the SPK cable Is the SPK cable Replace SPK cable normal? connected well? Cable inserts well. Is the RF/ AV/ Does IC400 Does IC401...
Page 23: Block Diagram
BLOCK DIAGRAM - 23 -...
Page 24: Exploded View
EXPLODED VIEW - 24 -...
Page 25: Exploded View Parts List
POWER SUPPLY ASSEMBLY, 480W 1H259W SANKEN 50 INCH LOW END PSU 68719SMH12A PWB(PCB) ASSEMBLY,SUB M.I MF056A H2 SIDE AV , DMS 4811V00168A BRACKET ASSEMBLY, SIDE AV 50PX4R-TB 6500VR0002A SENSOR, YGCA-T068A LG INNOTEK AMBIENT LIGHT DIGITAL EYE SENSOR ASSY - 25 -...
Page 26: Replacement Parts List
REPLACEMENT PARTS LIST LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION Q102 0TR102008AA KRA102S R/TP KEC SOT23 CHIP TR Q1200 0TR387500AA CHIP 2SC3875S(ALY) BK KEC 0IPRPML001A IC1000 MIC39100 MICREL 3P SOT223 R/TP Q200 0TR150400BA CHIP 2SA1504S(ASY) BK KEC IC1001 0IMCRRH001A BA033FP-E2 ROHM 3P-SOP,TO252-3...
Page 27 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
Page 28 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
Page 29 For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film follows;...
Page 30 MLB-321611-0500P-N2 MAG LAYERS R/TP ACCESSORIES L1207 6200J000013 MLB-321611-0500P-N2 MAG LAYERS R/TP MLB-321611-0500P-N2 MAG LAYERS R/TP L1208 6200J000013 3828VA0525R MANUAL, USER AP/50PX4RA-TA EN 141A TX 6200J000013 MLB-321611-0500P-N2 MAG LAYERS R/TP L1209 6710V00151E REMOTE CONTROLLER, AF05GB 42PX4R-ZA INPUT L200 6200J000013 MLB-321611-0500P-N2 MAG LAYERS R/TP...
Page 34 PRINTED CIRCUIT BOARD MAIN (TOP) MAIN (BOTTOM ) CONTROL(TOP) SIDE A/V(BOTTOM) CONTROL(BOTTOM)
Page 35 Sep., 2005 P/NO : 3828VD0209X Printed in Korea...

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