My Sansui 1770 monitor power supply is damaged by high voltage electric supply.So on the power supply area there`s a rectifier component being bursted and component number is no longer visible.Can you help me with the component number?

If your microwave oven doesn’t heat, you may have a problem with the high voltage diode or rectifier. This component helps provide the high voltage that powers the magnetron. The high voltage diode is located near the magnetron and the high voltage capacitor, so access will require removal of the cabinet. Disconnect the power and also discharge the high voltage capacitor to prevent an electrical shock. You can then test the diode for continuity with a multi-meter. Diodes are polarity specific and you should see low resistance with the meter leads in one direction and higher resistance when the meter leads are reversed. Most multi-meters will have a special setting for diodes or rectifiers. If the high voltage diode shows low resistance in both directions or shows no continuity at all, then it will need to be replaced. If you find the high voltage diode tests okay, then you will need to determine whether power is being supplied to the circuit. This is a high voltage circuit and further testing should only be performed by a qualified technician.

Most power conversion devices contains coils, such as transformers or inductors. These components use electromagnetism to convert AC main power to low-voltage DC power. The varying magnetic fields generated by these components can cause them to physically vibrate at high frequency, resulting in a high-pitched noise.
https://www.howtogeek.com/200466/why-do-some-ac-adapters-and-power-supplies-make-a-whining-noise/

If your microwave oven doesn't heat, you may have a problem with the high voltage diode or rectifier. This component helps provide the high voltage that powers the magnetron. The high voltage diode is located near the magnetron and the high voltage capacitor, so access will require removal of the cabinet. Disconnect the power and also discharge the high voltage capacitor to prevent an electrical shock. You can then test the diode for continuity with a multi-meter. Diodes are polarity specific and you should see low resistance with the meter leads in one direction and higher resistance when the meter leads are reversed. Most multi-meters will have a special setting for diodes or rectifiers. If the high voltage diode shows low resistance in both directions or shows no continuity at all, then it will need to be replaced. If you find the high voltage diode tests okay, then you will need to determine whether power is being supplied to the circuit. This is a high voltage circuit and further testing should only be performed by a qualified technician.

First of all it is called a diode and it is an active component. The way you test it is , first remove power from the circuit, then using a ohm meter on the high power ohms or diode test function. It should read high resistance in one direction and low resistance in the other direction you also can use a battery and light bulb in series connected to the diode. The light should light in one direction and not the other. If the diode is across a coil or low resistance device it may not be able to be tested accurately in circuit, in this case one end will need to be lifted from the circuit to test.

Power surges are damaging spikes of voltage in an electrical systems, caused by lightning strikes, changes or problems with the electrical grid, or large appliances.

Power surges damage or destroy computer hardware by overheating circuit boards and other components.

Surge protectors and other devices are used to protect computers and other electrical devices from power surges.

If damage occurs to a computer from a power surge, a process of trial and error is used to replace the damaged components.


Replace the surge protector or power strip.
If neither was attached to the computer, it is highly recommended that one be used.

Follow the user's manual to open the computer.
The computer manual may have shipped with the computer in book or CD form or may be found online.

Examine the system and make note of any visibly damaged components.
Damaged components may show visible burn damage or no damage at all.


Follow the user manual to remove the power supply.
You will need to unplug the power connections to each device in the computer as well as the system board.

WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL.
http://www.kitchentablecomputers.com/static.php - rules
Only work inside the computer case when the power has been switched off and disconnected. Never open the power source.

Some of the below steps recommend removing physical parts within the computer.
While in the computer it is highly recommend that you be aware of ESD and its potential hazards.


Removal is generally achieved by removing the holding screws and lifting the power supply out of the system.

Follow the user manual to install the new power supply.
Plug the power cables into the computer components and the system board.

Close the case.
Do not re-insert the screws.

Plug the power cable into the computer and attempt to power the computer on.

Replace the power cables to the monitor and computer.
Examine the monitor.

If the monitor does not power on, it will need to be replaced.
Determine if both the monitor and computer power on.

If the monitor powers on but the computer does not replace the system board.
If both power on but there is no video signal, replace the video card.

Boot the system into Windows.
Go to the "Control Panel" and double-click on the "System" icon.

Click on the "Hardware" tab.
Double-click the network card, sound card, and other peripherals that are listed in the hardware tab.

If you replaced the system board, ensure that the device drivers are in place for the peripherals. Replace any peripheral that is still non-functional.

Computer Repair Tutorial Help and Tips

http://www.thepcmanwebsite.com/computer_repair.shtml

Test your PSU power supply unit or replace it if your power supply units fan is not working your PSU is faulty
http://pcsupport.about.com/od/toolsofthetrade/f/powersupplytest.htm
Testing and replacing the PC power supply
http://www.youtube.com/watch?v=hbNxhvm0czs
One bad lead can cause a computer to continue on a cycle of restarting or to shutdown or fail to detect ,boot up a computer hard drive
WARNING Before you start troubleshooting remember that you are dealing with electricity that can KILL.
http://www.kitchentablecomputers.com/static.php - rules
Only work inside the computer case when the power has been switched off and disconnected. Never open the power source.
Some of the below steps recommend removing physical parts within the computer.
While in the computer it is highly recommend that you be aware of ESD and its potential hazards

Power surges are damaging spikes of voltage in an electrical systems, caused by lightning strikes, changes or problems with the electrical grid, or large appliances.
Power surges damage or destroy computer hardware by overheating circuit boards and other components.
Surge protectors and other devices are used to protect computers and other electrical devices from power surges.
If damage occurs to a computer from a power surge, a process of trial and error is used to replace the damaged components.
Replace the surge protector or power strip.
If neither was attached to the computer, it is highly recommended that one be used.

Follow the user's manual to open the computer.
The computer manual may have shipped with the computer in book or CD form or may be found online.
Examine the system and make note of any visibly damaged components.
Damaged components may show visible burn damage or no damage at all.


Follow the user manual to remove the power supply.
You will need to unplug the power connections to each device in the computer as well as the system board.
Removal is generally achieved by removing the holding screws and lifting the power supply out of the system.


Follow the user manual to install the new power supply.
Plug the power cables into the computer components and the system board.


Close the case.
Do not re-insert the screws.
Plug the power cable into the computer and attempt to power the computer on.


Replace the power cables to the monitor and computer.
Examine the monitor.
If the monitor does not power on, it will need to be replaced.

Determine if both the monitor and computer power on.
If the monitor powers on but the computer does not replace the system board.
If both power on but there is no video signal, replace the video card.
Boot the system into Windows.
Go to the "Control Panel" and double-click on the "System" icon.

Click on the "Hardware" tab. Double-click the network card, sound card, and other peripherals that are listed in the hardware tab.
If you replaced the system board, ensure that the device drivers are in place for the peripherals. Replace any peripheral that is still non-functional.


Computer Repair Tutorial Help and Tips
http://www.thepcmanwebsite.com/computer_repair.shtml

Hello
Seven continous blinks of standby light in Sony TVs indiates that there is some problem in power regulator side or on horizontal output side. It is due to high voltage shutdown. When the [EHT] voltage ie Extra High Tension voltage given to the final anode of the picture tube exceeds 33KVDC [33,000VDC], this happens. The cause may be in the power regulation side in your TV. Normally Sony TVs are working at about 120 to 135VDC. If voltage at this DC rail exeeds, EHT said above will increase beyond its limit, and CPU Ic inside your TV will detect it and shuts the whole system down to prevent further damages to more components. This is happening in your TV now.
This process is called saftey shutdown.
To rectify this problem you have to open the TV. Proper care should be taken before opening it as you are going to work with an electrical equipment, which has very high voltage points are there inside. All precautions must be taken before opening the TV.
Normally this fault will be due to the poor regulation of the power supply section inside your TV, that causes a voltage higher than normal is comming into the main circuit from power supply. STR type regulatros are being used in Sony sets for this regulation purpose. You just locate the power regulation side, and check for any loose solderings to the legs of the STR regulator or its nearby components. You must have some concept of sodereing in this matter. Components fitted on the power supply section will heat up while TV works. Ater long use, the soldering at the legs of the heated components may get loose. We can't detect loose contact exactly where it is. So it is a good practice to resolder the sodering of suspected components, and we in practical servicing field also do this trick.
If it doesn't help, the STR fitted inside may faulty. Desolder it out from the board and go for a same type and number. Replacing it will solve the problem. Ok

Hello nik286, hi, check first the label at the back of the TV, look for a voltage input something like a 90V-240V, if you see this, its an autovolt system, this type of power supply input is standard nowadays. Assuming your asking what would be damage, this could be anything from the fuse, thermal resistor, rectifier diodes, and the regulator IC of the power supply board.

CHECK FOR DAMAGED RESISTORS ON BOARD NEAR HIGH VOLTAGE AND ALSO ON CRT SOCKET, ITS A COMPONENT PROBLEM, RECTIFY IT..CHANGE THE DAMAGED COMPONENT, ALSO CAPACITORS IF POSSIBLE..