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LG FLATRON 915 FT PLUS Service Manual
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LG FLATRON 915 FT PLUS Service Manual

LG FLATRON 915 FT PLUS Service Manual

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LG
FLATRON 915FTPLUS
MODEL
SERVICE MANUAL

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Summary of Contents for LG FLATRON 915 FT PLUS

  • Page 1 FLATRON 915FTPLUS MODEL SERVICE MANUAL...

  • Page 2: Specifications

    SPECIFICATIONS 1. PICTURE TUBE 3-2. Power Consumption Size : 19 inch (Flat Slot Mask) MODE H/V SYNC POWER CONSUMPTION LED COLOR DefIection Angle : 90° Neck Diameter : 29.1 mm less than 140W NORMAL (ON) ON/ON GREEN Phosphor : P22 less than 8W STAND-BY OFF/ON...

  • Page 3: Timing Chart

    TIMING CHART VIDEO SYNC << Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >> Sync Blanking Time Total Period Video Active Front Porch Sync Duration Back Porch Mode Resolution Frequency Sort Polarity Time (B) – 31.469 31.778 25.422 6.356...

  • Page 4: Control Locations

    CONTROL LOCATIONS Control Function Ref. No. Control Function Ref. No. OSD SELECT/ADJUSTMENT (LEFT) POWER SWITCH OSD BUTTON SET BUTTON B + ADJUSTMENT OSD SELECT/ADJUSTMENT (RIGHT) VR901 HIGH-VOLTAGE ADJUSTMENT OSD SELECT/ADJUSTMENT (UP) VR2061 OSD SELECT/ADJUSTMENT (DOWN)

  • Page 5: Wiring Diagram

    WIRING DIAGRAM Anode Cap Purity Tilt Convergence P301 P319 P306 P302 Degauss CDT Earth P201 P207 P202 Purity P733 P932 P931 P701 P704 P613 P904 P903 P610 P612 P611 P101...

  • Page 6: Exploded View

    EXPLODED VIEW EXPLODED VIEW PARTS LIST Ref. No. Part No. Description Q'ty Material 3091TKC037B CABINET ASSY 2423GG3E41B CDT SET, M46QDG423X 01N6LD 6868T19001D CDT EARTH 339-002J SCREW ASSY, PHP+5x25(FZMW1)+GW18 4951TKS041A METAL ASSY, FRAME 6140TC2008A DEGAUSSING COIL 6174Z-1018D FBT(FLY BACK TRANSFORMER), FMMTC61-M1018D 6200TJB004A FILTER(CIRC), EMI 03ME3G(3) DELTA 4951TKS043A...
  • Page 7 DISASSEMBLY 1. TILT/SWIVEL REMOVAL 1) Set the monitor face downward. 2) Remove screw (a). 3) Pressing the latch (b), carefully remove the Tilt/Swivel by pulling it upward. 2. BACK COVER REMOVAL 1) Remove two screw covers (a). 2) Remove four screws (b) from the Back Cover.
  • Page 8 4. TOTAL CHASSIS ASSEMBLY REMOVAL 1) Disconnect P903, P904 (Degaussing pin), P704 (DY pin), P613 (Tilt pin), P610and P611, P612 (Purity pin) from the Main PCB. 2) Disconnect P306 (GND Wire) from the Video PCB. 3) Carefully separate the CDT Board Assembly from the CDT neck.
  • Page 9 7. MAIN BOARD ASS’Y REMOVAL 1) Remove seven screws (a). 2) Remove screw (b). 3) Remove two screws (c). 4) Remove two screws (d). 5) Remove the Main Bracket and the Bottom Bracket. 8. INTERFACE ASSEMBLY REMOVAL 1) Remove five screws (a). 2) Remove the interface Rear Shield.

  • Page 10: General Information

    ADJUSTMENT GENERAL INFORMATION 3. Adjustment for Factory Mode (Preset Mode). 1) Display cross hatch pattern at Mode 13. All adjustment are thoroughly checked and corrected 2) Run alignment program for Flatron 915FT(plus), when the monitor leaves the factory, but sometimes FB915B on the IBM compatible PC.
  • Page 11 ± 0.02FL of ± 1FL of 7) Adjust Screen control on the FBT to 0.15 15) Adjust SUB-CONTRAST command to 40 the raster luminance. the raster luminance. 8) Adjust B-BIAS and Sub-Brightness to 155 (decimal). 16) Display color 15,0 full white patten at Mode 8. 17) COLOR ADJ.

  • Page 12: Troubleshooting Guide

    TROUBLESHOOTING GUIDE 1. NO POWER NO POWER (POWER INDICATOR OFF) CHECK TROUBLE IN FUSE OK? FUSE (F901) CHECK C912 (+) VOLTAGE? TROUBLE IN (310VDC AT INPUT D901 VOLTAGE 110VAC) CHECK Q902 DRAIN TROUBLE IN WAVEFORM (SQUARE IC901 or Q902 WAVE COMES OUT?) CHECK D923, D922, D931, TROUBLE IN...
  • Page 13 2. NO CHARACTER NO CHARACTER CHECK TROUBLE IN IC302 PIN 3, 8, 12 (12V), P302, PIN 17 (5V)? 5V, 12V LINE TROUBLE IN CHECK PC SIGNAL, IC302 PIN 2, 6, 11 ? SIGNAL CABLE, IC2001 CHECK TROUBLE IN IC302 PIN 29, 32, 35 ? IC302 CHECK TROUBLE IN...
  • Page 14 3. NO RASTER NO VIDEO (POWER INDICATOR GREEN or ORANGE) CHECK TROUBLE IN ORANGE POWER INDICATOR D-SUB & 5-BNC GREEN or ORANGE ? SIGNAL CABLE GREEN MIN. ROTATE SCREEN CHECK (Counter-clockwise) CONTROL KNOB TO SCREEN CONTROL CLOCKWISE KNOB OF FBT CHECK VOLTAGE AT D924 CATHODE (195V)

  • Page 15: No Vertical Deflection

    4. NO VERTICAL DEFLECTION NO V-DEFLECTION (ONE HORIZONTAL LINE) CHECK TROUBLE IN IC601 PIN 2 (15V) ? T901 PIN 18 CHECK TROUBLE IN IC601 PIN 4 T901 PIN 17 (-12V)? CHECK TROUBLE IN IC201 PIN 12 IC201 (SAWTOOTH WAVE)? TROUBLE IN IC601, VERTICAL OUTPUT CIRCUIT...
  • Page 16 5. TROUBLE IN DPM STAND-BY/SUSPEND/ OFF MODE FAILURE CHECK CHECK PC, IC271 (MICOM) NO H / V SYNC SIGNAL (PC IS NOT GOING INTO PIN 42, 1 (H/V INPUT) DPM MODE) SIGNAL? INPUT H/V SYNC CHECK TROUBLE IN IC271 PIN 6, 7 X201, IC271 WAVEFORM? CHECK...
  • Page 17 6. NO DEGAUSSING BUTTON MUST BE PRESSED.) NO DEGAUSSING CHECK TROUBLE IN IC271 PIN 22 IC271 (MICOM) (5V)? CHECK TROUBLE IN Q271 COLLECTOR Q271 VOLTAGE (0.5V)? CHECK TROUBLE IN P903, P904? P903, P904 CHECK TROUBLE IN RL901? RL901 TROUBLE IN TH901, DEGAUSSING COIL...
  • Page 18 7. NO TILT (ROTATION ) NO TILT (ROTATION) CHECK TROUBLE IN IC612 PIN 12 VOLTAGE IC911, D922 (5V) ? CHECK TROUBLE IN IC612 PIN 4 D923, IC613 (-12V) ? TROUBLE IN CHECK IC271 (MICOM), IC704 IC612 PIN 3 ? IC612 TROUBLE IN P613, TILT COIL CONNECTOR, TILT COIL...
  • Page 19 8. TROUBLE IN OSD NO OSD CHECK TROUBLE IN IC301 PIN 4, 9 P302, D927 (5V) ? CHECK IC301 PIN 5 TROUBLE IN (NEGATIVE H-PULSE Q301, P302 COMES IN ?) CHECK IC301 PIN 10 TROUBLE IN (NEGATIVE V-PULSE Q302, P302 COMES IN?) CHECK IC301 PIN 13, 14, 15...

  • Page 20: Block Diagram

    BLOCK DIAGRAM...

  • Page 21: Description Of Block Diagram

    DESCRIPTION OF BLOCK DIAGRAM 1. Line Filter & Associated Circuit 6. Micom (Microprocessor) Circuit. This is used for suppressing noise of power input line The operating procedure of Micom (Microprocessor) and flowing into the monitor and/or some noise generated its associated circuit is as follows: in this monitor flowing out through the power input 1) H and V Sync signal is supplied from the D-sub to the line.
  • Page 22 14. H-Linearity Correction Circuit. 20. Moiré Reduction Circuit. This circuit corrects the horizontal linearity for each This circuit reduce interference between the periodical horizontal sync frequency. display pattern and the CRT’s slot (or dot). The positions of every other one dot video signal beams 15.

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