LG Studio Works 500E Service Manual Download Page 20

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CHECK

IC601 PIN 7 (45V)?

CHECK

IC401 PIN 33, 34

(SAWTOOTH WAVE)?

CHECK

IC601 Pin 3 (13V) ?

4. NO VERTICAL DEFLECTION

NO V-DEFLECTION

(ONE HORIZONTAL LINE)

TROUBLE IN

IC601, V-CIRCUIT

TROUBLE IN
T901 13V Line

Waveforms

TROUBLE IN
T701 40V line

TROUBLE IN
IC401

YES

IC401, #33

IC401, #34

Summary of Contents for Studio Works 500E

Page 1: ... PREC SAFETY PRECAUTIONS IN THIS MANUAL AUTIONS IN THIS MANUAL M ME EN NU U S SE EL LE EC CT T MODEL MODEL St Stud udio io W Wor orks 5 ks 505 05E E 505EL AP M AH M AL M 505EL AP M AH M AL M St Stud udio io W Wor orks 5 ks 505 05G G 505EL AP A AL A 505EL AP A AL A CHASSIS NO CA 138 CHASSIS NO CA 138 Same model for Service Same model for Service St Studi udio o Wo Work rks 500 s 500E E 505EL AP M A...

Page 2: ......

Page 3: ...ea rea 285 285 x x 215 mm 215 mm 11 22 x8 46 11 22 x8 46 Max Image Max Image Size Size 270 x 200 m 270 x 200 mm 10 m 10 63 63 x x 7 87 7 87 Pre Preset set Imag Image Siz e Size e 4 4 2 2 D Di is sp pl la ay C y Co ol lo or r F Fu ul ll C l Co ol lo or rs s 4 3 4 3 Di Displ splay ay Res Resolu olutio tion n 10 1024 x 24 x 768 768 60 60Hz Hz Non Interlace Non Interlace 4 4 4 4 V Vid ideo eo Ba Band ...

Page 4: ...n solder splashes or the sharp points Be sure to remove all foreign the sharp points Be sure to remove all foreign materials materials IMPLOSION PROTECTION IMPLOSION PROTECTION All used display tubes are equipped with an integral All used display tubes are equipped with an integral implosion protection system but care should be taken to implosion protection system but care should be taken to avoid...

Page 5: ...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 6: ...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 7: ...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 8: ...WIRING DIAGRAM 7 P501 option P301 P302 G2 P702 P701 T1 P402 P902 S S Signal Cable AC Socket F B T ...

Page 9: ... C o n t r o l 1 6 0 V 4 0 V 1 3 V D D F e e d B a c k 1 3 V S C L S D A H S y n c V S y n c P W M C o n t r o l S i g n a l 1 3 V 5 0 V D Y C D T H e a t e r 6 3 V I 2 C Screen H V R G B B i a s H D r i v e B D r i v e B D P M C o n t r o l C i r c u i t 6 3 V 8 V 8 0 V V o l t a g e f e e d b a c k D e g a u s s i n g C o i l Dynamic Foc us Static Focus 5 0 V 8 0 V 5 V G 2 G 1 A u t o B e a m L ...

Page 10: ... discriminates the operating mode from the sync polarity and resolution 3 After microprocessor reads these adjusted mode data stored at EEPROM it controls operating mode data through IIC 4 Users can control screen condition by the OSD Select Up Down Left Right Exit 5 The horizontal and vertical sync processor IC IC401 has a sync detector a saw tooth generator and drive function And outputs horizon...

Page 11: ...This circuit amplifies the video signal which comes from the video pre amp circuit and amplified it to applied the CDT cathode 14 Video Processor Circuit Video processor circuit consists of the video drive output block The video drive IC IC302 receives the video signal from PC The gain of each channel is controlled by MICOM through IIC The cut off circuit compensate different voltage of each chann...

Page 12: ...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 13: ... 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 14: ...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 carefully br...

Page 15: ...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 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 BIAS AD...

Page 16: ... 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 36 07 00 0A 20 20 20 20 20 20 00 00 00 FC 70 00 35 30 35 47 0A 20 20 20 20 20 20 20 20 00 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 00 00 FF FF FF FF FF FF 00 1E 6D 66 3B 01 00 00 00 10 01 0E 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 01 01 01 01 01 01 30 01 ...

Page 17: ...D941 D942 D906 CHECK FUSE OK F901 16 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 18: ...LE IN IC302 P301 TROUBLE IN IC303 TROUBLE IN IC304 YES YES YES YES 17 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 19: ...8 PIN20 PIN21 CHECK POWER INDICATOR GREEN or FLASH 18 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 20: ...WTOOTH WAVE CHECK IC601 Pin 3 13V 19 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 ...

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