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Website:http://biz.LGservice.com Website:http://biz.LGservice.com E-mail:http://www.LGEservice.com/techsup.html E-mail:http://www.LGEservice.com/techsup.html COLOR MONITOR COLOR MONITOR SERVICE MANUAL SERVICE MANUAL CHASSIS NO. : CA-138 CHASSIS NO. : CA-138 MODEL: MODEL: St Stud udio io W W or 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 W or orks 5 ks 505 05G G (505EL-AP**A, AL**A) (505EL-AP**A, AL**A)
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CONTENTS CONTENTS SPECIFICATIONS SPECIFICA TIONS ...................... 2 2 ADJUSTMEN ADJUSTMENT T ........................ 9 9 SAFETY PRECAUTIONS SAFETY PRECAUTIONS ................3 3 TROUBLESHOOT TROUBLESHOOTING GUIDE ING GUIDE ......1 ......1 6 6 SERVICE PRECAUTION SERVICE PRECAUTION ........4 ........
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SAFETY PRECAUTIONS SAFETY PRECAUTIONS SAFETY-RELATED COMPONENT WARNING! SAFETY-RELATED COMPONENT WARNING! X-RADIATION X-RADIATION There are special components used in this color monitor There are special components used in this color monitor The only potential source of X-radiation is the picture tube. The only potential source of X-radiation is the picture tube.
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SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this 9. Use with this receiver only the test fixtures specified in service manual and its supplements and addenda, read this service manual. and follow the SAFETY PRECAUTIONS on page 3 of this CAUTION: Do not connect the test fixture ground strap publication.
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General Soldering Guidelines Replacement 1. Use a grounded-tip, low-wattage soldering iron and 1. Carefully insert the replacement IC in the circuit board. appropriate tip size and shape that will maintain tip 2. Carefully bend each IC lead against the circuit foil pad and solder it.
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Circuit Board Foil Repair At Other Connections Excessive heat applied to the copper foil of any printed Use the following technique to repair the defective copper circuit board will weaken the adhesive that bonds the foil pattern at connections other than IC Pins. This technique to the circuit board causing the foil to separate from or involves the installation of a jumper wire on the "lift-off"...
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WIRING DIAGRAM P501(option) P701 P702 S + S T B F P402 Socket P902 Signal Cable P302 P301 - 7 -...
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BLOCK DIAGRAM Dynamic Foc us T D V Static Focus C 3 1 V . t m i t o H a i m e u n k A B L i o c t Y i a t D u D l a...
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DESCRIPTION OF BLOCK DIAGRAM 1. SMPS(Switching Mode Power Supply) 5. D/D Converter Circuit. When you turn on the power switch, the operating To obtain constant high voltage, this circuit supplies procedure is as follows: controlled DC voltage for FBT and horizontal deflection 1) The AC line voltage is rectified by the bridge diode circuit according to the horizontal sync frequency.
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DESCRIPTION OF BLOCK DIAGRAM 14. Video Processor Circuit. 15. Video Pre-Amp Circuit. Video processor circuit consists of the video drive This circuit amplifies the analog video signal from output block. The video drive IC(IC302) receives the 0~0.7 V to 0~4 V. It is operated by taking the clamp, video signal from PC.
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ADJUSTMENT 1. Preparation for Service Adjustment 2. Adjustment by Service Hot key How to enter SVC HOT KEY GENERAL INFORMATION 1. Press Menu and OSD window will appear. 2. While OSD window is displayed, is seen on the All adjustment are thoroughly checked and corrected left bottom of OSD window.
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4. Distortion 10.Parallelogram Scanning frequency : All Mode (Mode 1~4) Display image : Crosshatch pattern Horizontal : 10 Row Vertical : 8 Row 11. Adjustment of white ba lance (Ad justment of chromaticity diagram) *(Adjustment of white balance must be made after entering Hot Key Mode and DEGAUSS.) 2.0mm, 2.0mm...
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11-2. Adjustment of White Balance PROCEDURE After finishing adjustment of cut off (back raster), For trained and experienced service technicians only. approve "Color(15.0) Full white pattern". Use the following procedure to correct minor color Adjust BDRV Data = 80, SCON=127. purity problems: Adjust RDRV and GDRV to set chromaticity diagram at : x: 0.283 0.005...
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3. Adjustment Using Service software Program 2. Adjustment for White Balance and Luminance. (Adjustment Program) 1) Set the White Balance Meter. 2) Press the DEGAUSSING on the OSD menu for 1. Adjustment for Factory Mode (Preset Mode). demagnetization of the CDT. 3) Display color 0,0 pattern at Mode 4.
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4. EDID Data Edit Using Service software Program 4.1 Read and Modify EDID Data 1) Connector the monitor and adjust device as Figure1 2) Display color 15,0 cross hatch pattern at Mode 4. 3) Use EDIT – MODEL SEL. command to select the right model info file. 4) Use EDIT –...
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TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) TROUBLE CHECK IN FUSE (F901) FUSE OK?(F901) SMPS Switch (ON, OFF) CHECK TROUBLE IN D900 BRIDGE DIODE? BRIDGE DIODE (D900) CHECK C908(+) VOLTAGE TROUBLE IN 145VDC at 110V input IC901, Q901 310VDC at 220V input IC901, Q901 CHECK...
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2. NO CHARACTER NO CHARACTER TROUBLE IN CHECK P301, SIGNAL CABLE, IC302 PIN 5,6,7 PC SIGNAL CHECK TROUBLE IN IC302 PIN 1, 24, 23, 19, 20, 21 IC302, P301 PIN 18 (5V) ? CHECK IC303 PIN 1, 2, 3 TROUBLE IN PIN8 (8V), IC303 PIN 4 (80V) ?
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3. NO RASTER NO VIDEO (POWER INDICATOR GREEN or FLASH) CHECK FLASH TROUBLE IN POWER INDICATOR P302 SIGNAL CABLE GREEN or FLASH ? GREEN CHECK ROTATE SCREEN CONTROL SCREEN CONTROL KNOB TO CLOCKWISE KNOB OF FBT or COUNTER CLOCKWIES CHECK VOLTAGE AT D961 CATHODE (50V) TROUBLE IN PRIMARY...
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4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 Pin 3 (13V) ? T901 13V Line CHECK TROUBLE IN IC601 PIN 7 (45V)? T701 40V line CHECK TROUBLE IN IC401 PIN 33, 34 IC401 (SAWTOOTH WAVE)? TROUBLE IN IC601, V-CIRCUIT Waveforms...
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