Monitor Repairing


Monitor

Problems of Monitor

  1. Dead
  2. No Screen Light (Raster) but Power on
  3. No Vedio but having screen light
  4. Dim Vedio but Good Screen Light
  5. Spot on Monitor Power Off
  6. Screen Flashing on Display
  7. No Proper Color on Display
  8. Horizontal Jacking on Display
  9. Vertical Jacking on Display
  10. Vertical line on Display
  11. Horizontal Line on Display
  12. Horizontal Scrolling on Display
  13. High Frequency Sold in Monitor
  14. Vedio Disappear after Some Time

1.Dead

  1. Check the fuse
  2. Check the 220 AC volt input
  3. Check the DC volt a main capacitor 270V
  4. Check the main transistor  of power supply
  5. Check all the diode, Zanner diode, resistance around the main transistor
  6. Change the power supply IC UC3842 (8 Pin) PWN

2. No Screen Light (Raster) but Power on

  1. Check the heater light on CRT (Control Rays Tube)
  2. Check the heater voltage 6V pin no third & fourth
  3. Check the signal cable (VGA Cable)
  4. Check the main horizontal output transistor horizontal section
  5. Check all the resistance diode, transistor horizontal section

3. No Vedio but having screen light

  1. Check the VGA cable
  2. Check the dry sold in vedio section
  3. Check all the transistor in vedio section
  4. Check the red, green, blue voltage 70 to 100
  5. Change the vedio IC

4. Dim Vedio but Good Screen Light

  1. Check the amplifier transistor
  2. Check the heater voltage
  3. Change the CRT tube

5. Spot on Monitor Power Off

  1. Change the CRT tube
  2. Waving problem of display
  3. Check the dry sold in main board
  4. Change the main capacitor of power supply

6. Screen Flashing on Display

  1. Check the dry sold in vedio section
  2. Check the dry sold in horizontal section
  3. Check the VGA cable

7. No Proper Color on Display

  1. Check the VGA cable
  2. Check the dry sold in vedio section
  3. Check the (Red, Green, Blue) driver transistor in vedio section
  4. Check the amplifier transistor in vedio section
  5. Change the vedio IC

8. Horizontal Jacking on Display

  1. Check the horizontal section dry sold
  2. Check the horizontal hold variable
  3. Check the dry sold horizontal Yolk coil connection

9. Vertical Jacking on Display

  1. Check the vertical section dry sold
  2. Check the vertical hold variable
  3. Check the dry sold vertical Yolk coil connection

10 .Vertical line on Display

  1. Check the dry sold in Yolk coil connection
  2. Check the dry sold vertical section
  3. Check all the resistance. Diode vertical section
  4. Change the Vertical IC

11. Horizontal line on Display

  1. Check the dry sold in Yolk coil connection
  2. Check the dry sold horizontal  section
  3. Check all the resistance. Diode horizontal section

12. Horizontal Scrolling on Display

  1. Check the sync signal pin no 13 (VGA Cable)
  2. Check the horizontal hold variable
  3. Check the sync IC

13. High Frequency Sold in Monitor

  1. Check the dry sold in horizontal section. (TDA 4586)

14. Vedio Disappear after Some Time

  1. Check the dry sold in monitor
  2. Power supply
  3. Horizontal Section
  4. Vertical section

15 Pin VGA Connector Pin Configurations

1
Red
2
Green
3
Blue
6
Red-Ground
7
Green-Ground
8
Blue-Ground
5
Ground
10
Ground
11
Ground
13
Horizontal Sync
14
Vertical Sync

PCB Neck Pins Configurations

  1. Neutral
  2. Bluck
  3. Heater –
  4. Heater +
  5. Red “K”
  6. Gris 2 “Brightness”
  7. Green “K”
  8. Gris 1
  9. Neutral
  10. Focus Grid 3

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