LG Flatron T530B, 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 MODEL T530B T530BL AL CHASSIS NO CA 138 Same model for Service Same looking with new chassis Issue Date 2004 9 T530S T530SL AL ...

Page 2: ...8 46 Preset Image Size 270x 200 mm 10 63 x 7 87 4 2 Display Color Full Colors 4 3 Display Resolution 1024 x 768 70Hz Max Non Interlace 4 4 Video Bandwidth 75 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 356 0 mm 14 02 inch Depth 388 5 mm 15 30 inch Height 347 0 mm 13 66 inch 7 WEIGHT...

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: ...0 4 923 4 410 Z H front porch D uS 0 640 0 510 0 369 0 570 H sync time E uS 3 810 2 030 2 092 1 140 H back porch F us 1 910 3 810 2 462 2 700 Polarity V Frequency Hz 59 940 74 990 60 004 85 070 V Active A mS 16 684 13 335 16 666 11 755 V V Video B mS 15 254 12 802 15 880 11 178 E V blanking C mS 1 430 0 533 0 786 0 577 R V front porch D mS 0 318 0 026 0 062 0 018 T V sync time E mS 0 063 0 080 0 1...

Page 8: ...y remove the Tilt S wivel by pulling it upward 3 Remove the screw b Back cover by pushing it upward 4 R elease the latch c S ee Tip S pec 5 S lide the Back Cover away from the Front Cabinet of the monitor Tip C B A Tip S pec A Width 5 0 15 0mm B Depth 0 6 0 9mm C Height 12 0mm a B ack Cover C abinet c b ...

Page 9: ...WIR ING DIAGR AM 9 P501 P201 P405 P301 P302 G2 P702 P701 T1 P402 P902 S S S ignal Cable AC S ocket F B T P203 P202 ...

Page 10: ...X RAY Pro tection Cir cuit Bright ness Cont rol 160V 40V 13V D D Feed Back 13V SCL SDA H Sync V Sync PWM Cont rol Signal 13V 50V DY CDT Heater 6 3V I 2 C Screen H V R G B Bia s H Drive B Drive B DPM Contr ol Cir cuit 6 3V 8V 80V Voltage feedba ck Degaussing Coil Dynamic Foc us Static Focus 50V 80V 5V G2 G1 Au to Beam Li mit DC DC Converter FBT T701 Regul ation Cir cuit 13V SMPS T901 5V BRIGHTNESS ...

Page 11: ...nnel is controlled by MICOM through IIC The cut 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 turn...

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 4 2 Check D961 cathode voltage within 50V 1V 2 Adjustment for High Voltage 1 Display cross hatch pattern at Mode 4 2 Enter the SVC SUB menu as the following instruction 3 Adjust H Voltage to 24 5kV 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: ... 54kHz 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 carefully break ...

Page 16: ...peat above 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 4 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 ...

Page 17: ...F FF FF FF FF 00 1E 6D A8 3B 01 01 01 01 10 01 0F 01 03 78 1C 15 B0 EA 60 59 A4 54 46 9B 24 20 10 48 4C BF E8 00 31 59 45 59 61 4A 01 01 01 01 30 01 01 01 01 01 01 64 19 00 40 41 00 26 30 18 88 40 36 00 0E C8 10 00 00 18 F9 15 20 F8 30 58 1F 20 50 20 40 13 00 0E C8 10 00 00 1E 00 00 00 FD 00 32 60 78 1E 38 08 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 54 35 33 30 42 0A 20 20 20 20 20 20 20 00 00 01...

Page 18: ...V Control Line N o t u s e d R S 2 3 2 C P A R A L L E L V S Y N C P O W E R S T VGS MONIT OR E V Sync On Off Switch Switch must be ON F A B C E 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 ...

Page 19: ...D941 D942 D906 CHECK FUSE OK F901 19 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 20: ...LE IN IC302 P301 TROUBLE IN IC303 TROUBLE IN IC304 YES YES YES YES 20 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 21: ...8 PIN20 PIN21 CHECK POWER INDICATOR GREEN or FLASH 21 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 22: ...WTOOTH WAVE CHECK IC601 Pin 3 13V 22 4 NO VERTICAL DEFLECTION NO V DEFLECTION ONE HORIZONTAL LINE NO NO NO TROUBLE IN IC601 V CIRCUIT TROUBLE IN T90113V Line Waveforms TROUBLE IN T701 40V line TROUBLE IN IC401 YES YES YES IC401 33 IC401 34 9 8 8 9 ...

Page 23: ...O 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 NORMAL 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 Waveforms 50V 13V 80V 5...

Page 24: ...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 24 ...

Page 25: ...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 26: ... 12 CHECK Q711 Q716 CHECK L703 TROUBLE IN IC401 MICOM TROUBLE IN Q711 Q716 TROUBLE IN L703 TROUBLE IN C722 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 Cs1 L L H H H H Cs2 L H L H H H ...

Page 27: ...eform Q706 Collector is right 27 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 28: ...in 26 output duty varies with different DAC values 13 Tilt Failure optional 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 28 IC401 33 IC401 34 Waveforms ...

Page 29: ...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 29 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 30: ... are right IC401 Pin 45 and 46 inputs are right IC401 Pin 16 input is over 4 2V 17 Micom Failure 18 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 20 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 22 Purity Failure Degaussing YES NO Replace CRT and verify purity Done Refer to 6 NO Degaussing NO YES ...

Page 33: ...he misconvergence 23 Misconvergence Degauss the CDT Done Change CRT and readjust convergence Yes Done No 24 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 33 ...

Page 34: ...EXPLODED VIEW 34 10 12 12 13 11 2 11 1 7 B A 2 6 5 a b b 1 d 15 14 15 9 c 8 4 12 3 ...

Page 35: ...7 8 9 10 11 1 11 2 12 13 A B a b c CABINET ASSEMBLY T530 BRAND 043A SILVER APRAY FOR DI 3809TKB028F BACK COVER ASSEMBLY T530 B032 320T 8C358 14 15 4930TKK036A 4930TKK031C HOLDER PCB FIX FB770G HOLDER PCB FIX PC ABS d 332 110A SCREW PZS 3 6 MSWR FZMY 3313T15104C 6871TMTA38A MAIN TOTAL ASSEMBLY T530SL BRAND CA 138 PWB PCB ASSEMBLY MAIN T530EL KLRDMT BRAND CA 138 TOTAL 3091TKB055C 3091TKB055A CABINET...

Page 36: ... 01U 100V J POLY TP C417 6871TMAA04C MKT 100V 104JTR PHS26104 C419 6871TMAA04C 2200PF 100V J PE TP C420 6871TMAA04C 0 068U 100V K POLY TP C421 6871TMAA04C 1000PF 50V K B TR C422 6871TMAA04C 2200P 50V K B TS C423 6871TMAA04C 2200P 50V K B TS C424 6871TMAA04C 4 7UF SHL SD 50V M FM5 TP 5 C426 6871TMAA04C 470PF 50V K B TR C427 6871TMAA04C 470PF 50V K B TR C430 6871TMAA04C 0 1UF 50V Z F TR C601 6871TMA...

Page 37: ...N4005 1021 TIWAN SEMI TP DO41 600V 1A 30A 2USSEC 5 0UA D717 6871TMAA04C 1N4005 1021 TIWAN SEMI TP DO41 600V 1A 30A 2USSEC 5 0UA D719 6871TMAA04C RGP10J 1021 TIWAN SEMI TP DO41 600V 1A 30A 250NSEC 5UA D721 6871TMAA04C RGP10G 1021 TIWAN SEMI TP DO41 400V 1A 30A 150NSEC 5UA D723 6871TMAA04C 1N4148M PCTRONIX TP DO34 100V 75VA 2000MA 4NSEC 0 025UA D724 6871TMAA04C 1N4005 1021 TIWAN SEMI TP DO41 600V 1A...

Page 38: ... 00 TA52 R208 6871TSA724C 220 1 4W 3 5 TA52 R209 6871TSA724C 910 1 4W 3 5 TA52 R211 6871TSA724C 220 1 4W 3 5 TA52 R301 6871TMAA04C 75 1 4W 3 5 TA52 R302 6871TMAA04C 75 1 4W 3 5 TA52 R303 6871TMAA04C 75 1 4W 3 5 TA52 R305 6871TMAA04C 6 20K 1 6W 1 TA52 R314 6871TMAA04C 100 1 4W 3 5 TA52 R315 6871TMAA04C 100 1 4W 3 5 TA52 R319 6871TMAA04C 4 70K 1 4W 3 5 TA52 R320 6871TMAA04C 4 70K 1 4W 3 5 TA52 R326 ...

Page 39: ...MAA04C 56 OHM 1 6 W 1 TA52 R904 6871TMHA72C 39K OHM 2 W 5 SF R906 6871TMAA04C 620 1 4W 3 5 TA52 R907 6871TMAA04C 39K 1 4W 3 5 TA52 R910 6871TMAA04C 47K OHM 1 W 5 TA52 R911 6871TMAA04C 20 1 4W 3 5 TA52 R912 6871TMAA04C 18K 1 6W 1 TA52 R913 6871TMAA04C 2 7K OHM 1 6 W 1 00 TA52 R915 6871TMAA04C 200 1 4W 3 5 TA52 R916 6871TMAA04C 10K 1 4W 3 5 TA52 R918 6871TMAA04C 1K 1 4W 3 5 TA52 R923 6871TMAA04C 100...

Page 40: ... 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 IC401 20 Q799 Base Q799 Drain Q719 Drain Q705 Drain Q706 Base Q706 Collector FBT 12 IC302 5 6 7 IC302 1 IC302 24 IC302 23 IC302 19 20 21 CDT RK GK BK IC901 6 IC401 45 IC401 46 IC401 18 IC401 35 IC401 33 IC401 34 IC401 52 01 11 IC401 53 SCHEMA TIC DIAGRAM IC401 21 IC401 2...

Page 41: ... 42 43 PRINTED CIRCUIT BOARD 3 MAIN BOARD Component Side 4 MAIN BOARD Solder Side 1 CONTROL BOARD Component Side 2 CONTROL BOARD Solder Side ...

Page 42: ...Mar 2005 P NO 3828TSL109Q Printed in China ...