Basic Practical CRT Monitor Repair
Basic Practical CRT Monitor Repair

Course Code :BPM   
Course Duration: 3 months

Topics Covered

How to execute a Monitor Testing Program

*Explains the functions keys F1 to F10
*Explains the alphabet keys A,B,C,D & E

Removing Monitor Cover

-How to use a gently manner to remove a monitor cover

Safety Precautions

*Explain about the safety precaution when comes to monitor repair
*SMPS Filter Capacitor
*Discharging CRT anode
*High Voltage (24KV)
*Electrical shocks
*Fire
*Isolation Transformer
*Wearing goggles (especially tube)
*HOT Ground
*Lifting
*(Students will be able to know):-
- The danger of electrical shock and high voltage.
- How to avoid electrical shocks
- How to discharge the filter cap and anode voltage

Explanation on each section of a monitor

*Switch mode power supply (SMPS)
*Cathode Ray Tube (CRT)
*Video Board
*High Voltage Section
*Horizontal Section
*Vertical Section
*Flyback Transformer
*Micro-P IC
*Horizontal Output Transistor (HOT)
*Degaussing Coil
*Deflection Yoke Coil
*Switch Mode Power Transformer
*Posistor
*B+ FET
*Monitor Controls
*EEPROM IC

-How A Monitor Work

-Explain the functions of a monitor based on a basic monitor block diagram

*SMPS
*CRT
*Video Signal
*Video Driver Circuit
*Video Output Circuit
*Micro-P
*EEPROM
*Flyback Transformer
*B+ Circuit
*Horizontal Signal
*Horizontal Oscillator
*Horizontal Drive
*Horizontal Output
*Horizontal Deflection Coil
*Vertical Signal
*Vertical Oscillator
*Vertical Output
*Vertical Deflection Coil

How To Read Monitor Schematic Diagram

Describe to students every section of a monitor circuit base on a monitor schematic diagram

*(Students will be able to read a monitor schematic diagram and start troubleshooting, recognize monitor components symbols, for example:
Flyback Transformer, SMPS Transformer, CRT and etc.

-Removing Main Board From A Monitor

- To Discharge All Capacitors With Resistor And Screw Driver
- To remove all cables connected to CRT
- To Install back the main Board
Parts involved:
*Yoke Coil
*Degaussing Coil
*CRT Grounds
*Anode Cap
*Video Board
*Monitor Controls
*(Participants will be able to:-
- Remove and install main board without fear of getting electrical shock
- Double confirm before switching on the MONITOR otherwise it may not work.)
Flyback Transformer / SMPS / B+ Coil / Horizontal Yoke Coil
*Remove & Install a flyback transformer / SMPS / B+ Coil / Horizontal Yoke Coil
*To check flyback primary transformer winding if good or bad with a flyback Tester. Answer will be filled by participant.
*To check flyback internal capacitor if is good or shorted with an analog multimeter. Answer to be filled by participant
*To check flyback internal capacitor if is good or shorted with digital capacitor meter. Answer to be filedl by participant.
*To check SMPS primary winding if is good or bad with Flyback Tester. Answer to be filled by participant.

Tea Break

*To check B+ coil if it good or bad with Flyback Tester. Answer
to be filled by participant.
*To check Horizontal Yoke Coil if it is good or bad with Flyback
Tester. Answer to be filled by participant.
*(Participant will be able to know if flyback, SMPS, B+ coil and
Horizontal Yoke Coil is good or bad
-Diagnose a problem caused by a defective Flyback, SMPS, B+
Coil and Horizontal Yoke Coil)

Checking VGA Signal Cable

*To check if there is any broken wires in VGA signal cable.
*To explain each functions of a signal pin 1,2,3,13 and 14
*(Participant will be able to know:-
-if a monitor colors and sync problem are caused by a defective
signal cable
-how to fabricate a new VGA connector in case there is a broken
wire inside the VGA signal cable.)

Monitor Blur Buster

*Install a Monitor Blur Buster
*Remove a Monitor Blur Buster
*Explain the purpose of Monitor Blur Buster
*(Students will be able to:-
-Install a Monitor Blur Buster if a monitor blur
-Use Monitor Blur Buster to diagnose to see if blur are caused by
flyback or picture tube.

Making Internal Adjustment

*To make voltage measurement in some critical test points
within the monitor circuit such as
- Measure AC Voltage in
- SMPS filter cap
- All Secondary Voltage
- Voltage regulator input / output
- Micro-P
- Focus
- Anode
- B+ pin
- Display IC VCC
- Horizontal IC VCC
- Vertical IC VCC
- Heater
- G1
- G2
- R, G, B Cathode
- EEPROM
*(Students will be able to:-
-Troubleshooting minor monitor problems base on voltage
measurement
-Know where to begin troubleshooting when the voltage reading in
incorrect.)
Lunch Break

Illustration Of Monitor Problems & Solutions

*To explore participant to real life monitor problem and suggested
solution
- No Power
- No display
- No Raster but have picture
- Raster too bright (with retrace line)
- Blur display (poor focus)
- Dim Display
- Horizontal size big
- Horizontal size small
- Cannot save current setting
- Monitor has tic-tic sound
- One Horizontal Line
- Vertical size big
- Vertical size small
- No green color (only purple color)
- No red color (only cyan color)
- No blue color (only yellow color)
- Adjust brightness no effect
- Pincushion out
- No vertical sync
- No horizontal sync
- Vertical overlapping
- Power Blink
- One vertical line
*(Students will be able to:-
-Diagnose monitor problem base on symptom appeared on the monitor screen