LG 50PG70FD, Service Manual

Page 1: ...V SERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS PA81C MODEL 50PG70FD 50PG70FD AB website http biz LGservice com Internal Use Only CH VOL MENU INPUT ENTER ...

Page 2: ...t reserved Only for training and service purposes LGE Internal Use Only CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SPECIFICATION 4 ADJUSTMENT INSTRUCTION 5 TROUBLE SHOOTING 11 BLOCK DIAGRAM 20 EXPLODED VIEW 25 SVC SHEET 27 PRINTED CIRCUIT DIAGRAM 36 ...

Page 3: ...by it s Neck Leakage Current Cold Check Antenna Cold 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 positioin 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 expose...

Page 4: ... Input voltage 100 240V 50 60Hz Standard Voltage of each product is marked by models 4 Specification and performance of each parts are followed each drawing and specification by part number in accordance with SBOM 5 The receiver must be operated for about 20 minutes prior to the adjustment V Test Method 1 Performance LGE TV test method followed 2 Demanded other specification Safety CB specificatio...

Page 5: ... more than 20 minutes Especially digital pattern cross hatch pattern an after image may be occur in the black level part of the screen PCB Assembly Adjustment Method Caution Using power on button of the control R C power on TV All adjustment process is executed one time through RS 232C Do not connect external input cable Power off TV After adjustment method not using in stop button of control R C ...

Page 6: ...and enter EZ ADJUST 2 Select 5 EDID D L by using D E CH and press ENTER V 3 Select Start and press ENTER V 4 EDID download is executed automatically 5 Press EXIT key on R C 7 1 EDID DATA 1 RGB EDID Numbers in the red line is week year manufacture and numbers in the blue line is check sum 2 HDMI EDID 1 HDMI 1 Numbers in the red line is week year manufacture and numbers in the blue line is check sum...

Page 7: ...ent Method 1 60 Va Adjustment refer Fig 1 1 After receiving 100 Full White Pattern HEAT RUN 2 Connect terminal of D M M to Va pin of P811 connect terminal to GND pin of P811 3 After turning VR901 voltage of D M M adjustment as same as Va voltage which on label of panel right top Deviation 0 5V 2 60 Vs Adjustment refer Fig 1 1 Connect terminal of D M M to Vs pin of P811 connect terminal to GND pin ...

Page 8: ... adjustment as same as Va voltage which on label of panel right top deviation 0 5V 8 50 Vs Adjustment refer fig 4 1 Connect terminal of D M M to Vs pin of P816 connect terminal to GND pin of P816 2 After turning VR951 voltage of D M M adjustment as same as Vs voltage which on label of panel right top deviation 0 5V 9 60 Va Adjustment refer Fig 5 1 After receiving 100 Full White Pattern HEAT RUN 2 ...

Page 9: ...t to auto controller or push control R C IN START Enter the mode of White Balance the pattern will come out 9 3 Auto Control Interface and Directions 1 Adjust in the place where the influx of light like floodlight around is blocked illumination is less than 10ux 2 In case of PDP Measure and adjust after sticking the Color Analyzer CA 100 CA210 to the side of the module 3 Aging time After aging sta...

Page 10: ... color temperatures COOL MEDIUM WARM Control is carried out thress times Temperature COOL R Cut G Cut B Cut is set to 64 Control R Gain and G Gain Each Gain is limited to 192 Temperature MEDIUM R Cut G Cut B Cut is set to 64 Control R Gain and G Gain Each Gain is limited to 192 Temperature WARM R Cut G Cut B Cut is set to 64 Control G Gain and B Gain Each Gain is limited to 192 10 Copyright 2008 L...

Page 11: ...TROUBLE SHOOTING GUIDE 11 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 12: ... 12 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 13: ... 13 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 14: ... 14 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 15: ... 15 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 16: ... 16 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 17: ... 17 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 18: ... 18 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 19: ... 19 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 20: ... 20 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only BLOCK DIAGRAM ...

Page 21: ... 21 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 22: ... 22 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 23: ... 23 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 24: ... 24 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 25: ... 202 203 301 901 900 Many electrical and mechanical parts in this chassis have special safety related 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 X RADIATION Shock Fire or other Hazards Do not modify the original design wi...

Page 26: ... 27 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 27: ... 28 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 28: ... 29 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 29: ... 30 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 30: ... 31 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 31: ... 32 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 32: ... 33 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 33: ... 34 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 34: ... 35 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 35: ... 36 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes MAIN TOP ...

Page 36: ... 37 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes MAIN BOTTOM ...

Page 37: ... 38 LGE Internal Use Only Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes PRE AMP TOP CONTROL TOP CONTROL BOTTOM PRE AMP BOTTOM ...

Page 38: ...May 2008 Printed in Korea P NO MFL48162001 ...