LG Flatron T710P, Service Manual

Page 1: ...ce com E mail http www LGEservice com techsup html CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MENU SELECT Brightview MODEL T710PH T710PHL AL E CHASSIS NO CA 139 T710PHL AL Q Issue Date 2004 7 T710P T710PL AL E T710PL AL Q ...

Page 2: ...243 8 mm 12 80 x 9 60 Preset Image Size 310x 230 mm 12 20 x 9 06 4 2 Display Color Full Colors 4 3 Display Resolution 1280 x 1024 75Hz Max Non Interlace 4 4 Video Bandwidth 180 MHz 5 ENVIRONMENT 5 1 Operating Temperature 0 C 40 C Ambient 5 2 Relative Humidity 10 80 Non condensing 5 3 Altitude 5 000 m 6 DIMENSIONS with TILT SWIVEL Width 400 mm 15 75 inch Depth 411 mm 16 18 inch Height 401 mm 15 79 ...

Page 3: ...joints frayed leads damaged insulation solder splashes or the sharp points Be sure to remove all foreign materials IMPLOSION PROTECTION All used display tubes are equipped with an integral implosion protection system but care should be taken to avoid damage and scratching during installation Use only same type display tubes X RADIATION The only potential source of X radiation is the picture tube H...

Page 4: ...st receiver ground lead to the receiver chassis ground before connecting the test receiver positive lead Always remove the test receiver ground lead last 9 Use with this receiver only the test fixtures specified in this service manual CAUTION Do not connect the test fixture ground strap to any heat sink in this receiver Electrostatically Sensitive ES Devices Some semiconductor solid state devices ...

Page 5: ...tip as the solder melts 2 Draw away the melted solder with an anti static suction type solder removal device or with solder braid before removing the IC Replacement 1 Carefully insert the replacement IC in the circuit board 2 Carefully bend each IC lead against the circuit foil pad and solder it 3 Clean the soldered areas with a small wire bristle brush It is not necessary to reapply acrylic coati...

Page 6: ...onnection 4 Route the jumper wire along the path of the out away copper pattern and let it overlap the previously scraped end of the good copper pattern Solder the overlapped area and clip off any excess jumper wire At Other Connections Use the following technique to repair the defective copper pattern at connections other than IC Pins This technique involves the installation of a jumper wire on t...

Page 7: ... E Blanking Time C Back Porch F Front Porch D Resolution B A C F D E 37 50 74 99 53 68 85 07 68 677 85 00 79 976 75 025 640 X 480 800 X 600 1024X 768 1280X 1024 26 67 20 32 6 35 2 03 3 81 0 51 13 335 12 802 0 533 0 080 0 427 0 026 18 63 14 22 4 41 1 14 2 70 0 57 11 755 11 178 0 577 0 056 0 503 0 018 14 561 10 836 3 725 1 016 2 201 0 508 11 764 11 182 0 582 0 044 0 524 0 014 12 504 9 481 3 022 1 06...

Page 8: ...remove the Tilt Swivel by pulling it upward 3 Pressing the latch b Back cover by pushing it upward 4 Release the latch c See Tip Spec 5 Slide the Back Cover away from the Front Cabinet of the monitor Tip C B A Tip Spec A Width 5 0 15 0mm B Depth 0 6 0 9mm C Height 12 0mm a Back Cover Cabinet c ...

Page 9: ...WIRING DIAGRAM 9 P501 P201 P405 P301 P302 G2 P702 P701 T1 P402 P902 S S Signal Cable AC Socket FBT ...

Page 10: ...ircuit Dynamic FOCUS Circuit Brightness Control 160V 40V 13V D D Feed Back 13V SCL SDA H Sync V Sync PWM Control Signal 13V 50V DY CDT Heater 6 3V I 2 C Screen H V R G B Bias H Drive B Drive B 13V DPM Control Circuit 5V 6 3V 8V 80V Voltage feedback Degaussing Coil Dynamic Focus Static Focus TILT Coil 50V 80V 5V G2 G1 Auto Beam Limit DC DC Converter FBT T701 Regulation Circuit 13V SMPS T901 5V BRIG...

Page 11: ...off circuit compensate different voltage of each channel between the cathode and the G1 of the CDT 1 The AC line voltage is rectified by the bridge diode D900 2 The control IC IC901 starts switching and generates switch pulse in the primary turn of the SMPS transformer T901 3 The switching pulses of the primary turns are induced to the secondary turns of the transformer by the turn ratio This puls...

Page 12: ...signal from 0 0 7 V to 0 4 V It is operated by taking the clamp R G B drive and contrast signal from the MICOM IC401 16 Video Output Amp Circuit This circuit amplifies the video signal which comes from the video pre amp circuit and amplified it to applied the CDT cathode ...

Page 13: ...x position 1 Adjustment for B Voltage 1 Display cross hatch pattern at Mode 3 2 Check D961 cathode voltage within 50V 1V 2 Adjustment for High Voltage 1 Display cross hatch pattern at Mode 3 2 Enter the SVC SUB menu as the following instruction 3 Adjust H Voltage to 25 8kV 0 1 kV by adjust 1 P value 2 Adjustment by Service Hot key How to enter SVC HOT KEY 1 Press Menu and OSD window will appear 2 ...

Page 14: ...0 Contrast Maximum Brightness Maximum Color temperature 9300K 11 1 Adjustment of cut off Adjustment of back raster 11 1 a Before adjustment press Menu and Degauss to remove Enter hot key mode Adjust Brightness and Contrast to Max in OSD window 1 Adjust cut off back raster first Enter DEGAUSS in the Menu and modify the following data Modify RCUT to Min Modify GCUT To Min Adjust to BCUT Data 127 7F ...

Page 15: ...24 x 768 85Hz 69kHz 85Hz Display image White flat field Luminance Cut off point at the center of the display area Note Color purity adjustments should only be attempted by qualified personnel PROCEDURE For trained and experienced service technicians only Use the following procedure to correct minor color purity problems 1 Make sure the display is not affected by external magnetic fields 2 Very car...

Page 16: ...ove from number 6 to 16 20 COMMAND PRESET EXIT Y Yes command 2 Adjustment for White Balance and Luminance 1 Set the White Balance Meter 2 Press the DEGAUSSING on the OSD menu for demagnetization of the CDT 3 Display color 0 0 pattern at Mode 3 4 COMMAND PRESET START Y Yes command 5 Set Bightness and Contrast to max position 6 COLOR ADJ LUMINANCE command of the alignment program 7 COLOR ADJ BIAS AD...

Page 17: ... F A B C 15 10 5 5 6 9 1 1 1 14 13 25 6 5V 5V 5V 4 7K 4 7K 4 7K 74LS06 74LS06 OFF ON OFF ON 11 VIDEO SIGNAL GENERATOR Figure 1 Cable Connection Figure 1 Cable Connection T710PL ０ １ ２ ３ ４ ５ ６ ７ ８ ９ Ａ Ｂ Ｃ Ｄ Ｅ Ｆ ０ ００ ＦＦ ＦＦ ＦＦ ＦＦ ＦＦ ＦＦ ００ １Ｅ ６Ｄ ６８ ４３ ０１ ００ ００ ００ １ ０１ ０Ｅ ０１ ０３ ６８ ２１ １８ Ｂ５ ＥＡ Ｆ６ ２９ Ａ２ ５３ ４７ ９９ ２５ ２ １０ ４８ ４Ｃ ＦＦ ＦＦ ８０ ３１ ４Ｆ ３１ ５９ ７１ ４Ｆ ４５ ５９ ６１ ４Ｆ ３ ６１ ５９ ８１ ８Ｆ Ａ９ ４５ Ｃ０ ３４ ００ ９８ ５１ ００ ２Ａ ...

Page 18: ...D941 D942 D906 CHECK FUSE OK F901 18 TROUBLESHOOTING GUIDE 1 NO POWER NO POWER POWER INDICATOR OFF NO NO NO NO TROUBLE IN Q951 Q952 Q941 Q942 TROUBLE IN FUSE F901 SMPS Switch ON OFF Waveforms TROUBLE IN BRIDGE DIODE D900 TROUBLE IN IC901 Q901 TROUBLE IN D971 D961 D951 D904 D941 D942 D906 YES YES YES YES Q901 Drain IC901 6 2 1 ...

Page 19: ...LE IN IC302 P301 TROUBLE IN IC303 TROUBLE IN IC304 YES YES YES YES 19 CHECK IC302 PIN 5 6 7 CHECK IC302 PIN 1 24 23 19 20 21 PIN 18 5V CHECK IC303 PIN 1 2 3 PIN8 8V PIN 4 80V CHECK R G B CATHODE VOLTAGE IC302 5 6 7 IC302 23 IC302 19 20 21 IC302 1 IC302 24 CDT RK GK BK Waveforms 28 27 30 31 26 27 28 29 30 31 29 ...

Page 20: ...8 PIN20 PIN21 CHECK POWER INDICATOR GREEN or FLASH 20 3 NO RASTER FLASH NO NO NO TROUBLE IN IC401 MICOM TROUBLE IN P302 SIGNAL CABLE ROTATE SCREEN CONTROL KNOB TO CLOCKWISE or COUNTER CLOCKWIES TROUBLE IN PRIMARY CIRCUIT OF T901 TROUBLE IN CDT SOCKET BOARD GREEN YES YES YES NO VIDEO POWER INDICATOR GREEN or FLASH IC401 18 IC401 20 IC401 21 14 7 5 5 14 7 Waveforms ...

Page 21: ...WTOOTH WAVE CHECK IC601 Pin 3 13V 21 4 NO VERTICAL DEFLECTION NO V DEFLECTION ONE HORIZONTAL LINE NO NO NO TROUBLE IN IC601 V CIRCUIT TROUBLE IN T901 13V Line Waveforms TROUBLE IN T701 40V line TROUBLE IN IC401 YES YES YES IC401 33 IC401 34 9 8 8 9 ...

Page 22: ...YNC SIGNAL NO NO NO TROUBLE IN T901 or PC CHECK PC PC IS NOT GOING INTO DPM MODE TROUBLE IN X401 IC401 TROUBLE IN IC401 TROUBLE IN IC401 NO TROUBLE IN Q941 Q951 NO H V SYNC SIGNAL YES YES YES YES DPMS TABLE NORMAR ON ON NORMAL GREEN STAND BY OFF ON OFF 0V FLASH SUSPEND ON OFF OFF 0V FLASH OFF OFF OFF OFF 0V FLASH H V SYNC VIDEO LED MODE ITEM C401 45 IC401 46 CHECK IC401 PIN 16 5V HIGH 4 3 Waveform...

Page 23: ...VOLTAGE 0 5V CHECK P902 CHECK RL901 CHECK IC401 PIN 4 5V 6 NO DEGAUSSING NO DEGAUSSING NO NO NO NO TROUBLE IN TH901 DEGAUSSING COIL TROUBLE IN IC401 MICOM TROUBLE IN D953 TROUBLE IN P902 TROUBLE IN RL901 YES YES YES YES 23 ...

Page 24: ...O NO NO NO 1 Check IC401 Pins 39 40 41 2 Replace IC401 Check Q720 50V LINE D710 Check Q704 Check 13V line Check and replace T703 and Q706 Check DY connector connection YES YES YES IC401 18 Q706 Base Q706 Collector Q719 Drain Q705 Drain 5 18 19 21 20 Waveforms 8 Invariable H_Size NO Check and replace IC401 Check if DC voltage of IC401 PIN 35 wave is Variable 6 IC401 35 6 ...

Page 25: ...IN IC401 MICOM TROUBLE IN Q711 Q716 TROUBLE IN L703 TROUBLE IN C722 C723 C726 C729 NO NO NO YES YES YES Cs SIGNAL TABLE HORIZONTAL FREQUENCY fH 30K 33 9K 34K 38 9K 39K 43 9K 44K 48 9K 49K 51 9K 52K 57 9K 58K 61 9K 62K 65 9K 66K 71K 71K 85K Cs1 L L H H H H H H H H Cs3 L L L H L L L H H H Cs2 L H L L H H H H H H ...

Page 26: ...eform Q706 Collector is right 26 10 Abnormal H_Size NO NO Repeat the troubleshooting Guide of H_deflection failure Check D D converter circuit Check IC401 B control circuit YES 11 Side Pin or Trap Failure NO 12 Para or Pin Balance Failure Replace IC401 Check and replace IC401 Q706 Collector IC401 35 21 6 21 6 Waveforms ...

Page 27: ...401 Pin 26 output duty varies with different DAC values 13 Tilt Failure Check tilt connector connection Check and replace CRT NO NO Check and replace IC401 Check Q503 Q501 Q502 YES YES 14 V Size or Pos Variation Failure Check and replace IC401 and IC601 NO Check some parts around IC401 YES 27 IC401 33 IC401 34 Waveforms ...

Page 28: ...ion failure YES YES 16 ABL Failure YES NO Check and replace CRT Input full white pattern to monitor Check P302 D801 R801 803 R798 Check and replace IC302 Check and replace T701 NO YES 28 Q719 Drain Q706 Collector IC302 Pin22 input exists and varies with different patterns T701 Pin 6 Voltage exists 18 18 Waveforms 21 21 YES waveform is right Q719 drain ...

Page 29: ...Pin 24 output are right Q710 and parts around are right 17 Focus Failure NO NO NO Check the connection between FBT Pin 12 CRT Socket PCB Check and replace IC401 Waveforms Replace failed part Replace failed part YES YES YES 29 IC401 24 FBT 12 22 23 ...

Page 30: ... are right IC401 Pin 45 and 46 inputs are right IC401 Pin 16 input is over 4 2V 18 Micom Failure 19 OSD Failure NO NO NO NO Done Change IC302 Check Q903 D908 ZD902 Check X401 Check and replace R451 C408 Replace IC401 YES YES YES YES 30 IC401 45 IC401 46 Waveforms ...

Page 31: ...d replace IC401 Check and replace function key YES 21 Missing Color NO Change the CRT Check signal generator and signal cable NO Refer to 2 No Charcter NO Check and replace IC303 and IC304 NO Check C341 C346 and G2 wire Check around FBT circuits also YES YES YES YES 31 Proper AC voltage are on all cathodes Proper DC voltage are on all cathodes G2 voltage is right ...

Page 32: ...ible Retrace Check white balance adjustment NO NO NO Done Check G2 control volume and FBT Check IC302 and related components Check Q799 and related components YES YES YES 32 Degaussing circuit is right Purity is right 23 Purity Failure Degaussing YES NO Replace CRT and verify purity Done Refer to 6 NO Degaussing NO YES ...

Page 33: ...Done Change CRT and readjust convergence Yes Done No 25 Poor Focus Adjust focus VR Check focus leads from FBT to CRT Socket Check the CRT Socket YES Aging monitor and check for focus change NO Refer to 18 Dynamic Focus Failure NO Replace the CRT and verify focus YES 33 Dynamic focus circuit is right ...

Page 34: ...EXPLODED VIEW 34 10 13 12 13 11 2 11 1 4 3 7 B A 2 6 6 5 9 8 a b c b 1 M EN U SE LE CT Br igh tvi ew ...

Page 35: ...DQT BRAND CA 139 TOTAL SCREW DRAWING D3 5 L10 0 MSWR FZMY SW3 5 RW3 5 SCREW ASSEMBLY TAPTITE P TYPE D3 0 L10 0 MSWR FZMY SW3 RW10 SCREW DRAWING PZP 3 10 MSWR FZMY Part No 3091TKC089E 3091TKC106K 3091TKC089B 3091TKC106H 6318L17023A 3809TKC050B 3043TKK136A 339 002K 6174T11004G 6620TKB002D or 6620TKB002B 6850TA9012A 6871TST586A 4950TKS155S 4950TKS212D 4810TKK150A 4810TKK151A 332 102F 4810TKK204A 3313...

Page 36: ...1010K515 100PF 50V K B TR C414 0CE106CF638 Ò10UF SHL SD 16V M FM5 TP 5Ó C415 0CK2220K515 2200P 50V K B TS C416 0CQ1031N409 0 01U 100V J POLY TP C417 0CK1040K945 0 1UF 50V Z F TR C418 0CK1040K945 0 1UF 50V Z F TR C419 0CQ2221N409 2200PF 100V J PE TP C420 0CQ6831N509 0 068U 100V K POLY TP C421 0CK1020K515 1000PF 50V K B TR C422 0CK2220K515 2200P 50V K B TS C423 0CK2220K515 2200P 50V K B TS C424 0CE4...

Page 37: ...148M PCTRONIX TP DO34 100V 75VA 2000MA 4NSEC 0 025UA D406 0DSPT00019A PSS244 PCTRONIX TP DO34 280V 625MA 1000MA 50NSSEC 10UA D501 0DSPT00029A 1N4148M PCTRONIX TP DO34 100V 75VA 2000MA 4NSEC 0 025UA D703 0DRGF00120A MUR460 15MM GULF BK DO201AD 600V 4A 150A 45NSSEC 10UA D704 0DRFC00300A FFPF04U150S FAIR CHILD BK TO220F 1500V 4A 40A 150NSSEC 7UA D705 0DRTW00089A SRT14 1021 TIWAN SEMI TP NON 40V 1A 25...

Page 38: ...KTC3198 Y KTC1815 TP KEC TO92 NPN Q703 0TFFC10012A FQPF10N20C FAIRCHILD ST TO220F 200V 9 5A Q704 0TR390409CA FAIRCHILD 2N3904 TA TP TO 92 60V 0 2A Q705 0TR200009AB KTC200 Y TP KEC TO92 NPN Q706 0TRFC10007A FJAF6815 FAIRCHILD ST TO3PF 1500V 15A Q710 0TRKE90020A MPSA44 KEC TP TO92 500V 300MA Q711 0TF630001BB SGS T STM IRF630MFP ST TO220F 200V 5A Q712 0TF630001BB SGS T STM IRF630MFP ST TO220F 200V 5A...

Page 39: ... 7 0 5 TA52 R605 0RD0102A609 10 OHM 1 2 W 7 0 5 TA52 R606 0RD4700Q609 470 OHM 1 4 W 3 4 5 TA52 R607 0RN4301F409 4 30K 1 6W 1 TA52 R608 0RD5600A609 560 OHM 1 2 W 7 0 5 TA52 R701 0RD4700Q609 470 OHM 1 4 W 3 4 5 TA52 R702 0RD6200Q609 620 1 4W 3 5 TA52 R703 0RD5601Q609 5 60K 1 4W 3 5 TA52 R704 0RD1002Q609 10K 1 4W 3 5 TA52 R705 0RD0102Q609 10 1 4W 3 5 TA52 R706 0RD3302A609 33K OHM 1 2 W 7 0 5 TA52 R72...

Page 40: ... 4S HUA JIE AC UNIVERSAL 3PIN BLACK SG305 6918TRT005A ÒSSG 102 A0 1KV SMART RADIAL TAPINGÓ SG701 6918TRT005A ÒSSG 102 A0 1KV SMART RADIAL TAPINGÓ SW201 6600R00001A ÒJTP1280F6 JEIL 12V DC 1MA VERTICAL 7MMÓ SW202 6600R00001A ÒJTP1280F6 JEIL 12V DC 1MA VERTICAL 7MMÓ SW203 6600R00001A ÒJTP1280F6 JEIL 12V DC 1MA VERTICAL 7MMÓ SW204 6600R00001A ÒJTP1280F6 JEIL 12V DC 1MA VERTICAL 7MMÓ SW205 6600R00001A ...

Page 41: ...01 01 01 26 01 27 01 28 01 29 30 31 01 01 14 01 15 01 16 01 17 01 18 01 19 01 20 01 21 22 01 02 01 03 01 04 01 05 01 06 01 07 01 08 01 09 01 10 Q901 Drain IC801 8 IC601 6 IC601 8 Q833 Drain Q832 Drain Q801 Base Q801 Collector IC802 3 Q704 Gate IC305 5 6 7 IC302 1 IC302 24 IC302 23 IC302 19 20 21 CDT RK GK BK IC901 6 IC401 8 IC401 9 IC801 6 IC801 11 IC801 13 IC801 12 IC801 15 01 11 IC801 14 ...

Page 42: ... 44 45 PRINTED CIRCUIT BOARD 3 MAIN BOARD Component Side 4 MAIN BOARD Solder Side 1 CONTROL BOARD Component Side 2 CONTROL BOARD Solder Side ...

Page 43: ...Jul 2004 P NO 3828TSL105K Printed in China ...