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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?

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Go to web site of monitor get them from company easy as that jim

Posted on Apr 05, 2011

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I have a sansui PDP42TD1, and i can't adjust the brightness. the whole colour setting is ghosted, can you help?


Fault to the main power supply regulator section. Either it will be on a separate board, or on the part of its main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Aug 26, 2015 | Sansui Televison & Video

4 Answers

How do you test a diod in the circuit


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.

Aug 07, 2014 | Electronics - Others

1 Answer

Power light off


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

Dec 08, 2013 | Dell Vostro 410 Desktop Computer

1 Answer

I can not turn it on. How can I fix a no power problem?


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

Jul 01, 2013 | Lenovo IdeaCentre K320 3019 PC Desktop

1 Answer

The tv turned off by itself and now wont turn back on it is a sansui san2701


In most cases the standby light might blink with different rapidity to indicate a fault relevant to the processor. It is possible that most of these indicate that there are errors in the processing section . Since there is a possible short or leak in the circuit the output driver section can take in huge current to trip the SMPS or from advice from the micro processor. Remove the power plugs and make sure that high voltage sections are discharged of the potential stored in capacitors. Look for visible signs of leak or of busted capacitors. Look for bulged capacitors or damaged components- burnt or busted. Use a multimeter to check the continuity or shorting in components, if so detach from circuit and test . If the voltage builds up and the set power ON and then shuts up then the suspected section must be checked in detail.

The processor must have the +5 voltage to the function properly , the +B and secondary voltages also must be checked to infer the fault. Trace with caution and in running through the signal path , circuit trail.

If there is no power at all check the power supply unit - the SMPS

check the link

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies


May 05, 2011 | Sansui Televison & Video

1 Answer

Samsung DVD player Model P460D Capacitor across the rectifier diode got burst, Fuse blown off due to voltage fluctuation / over voltage. after replacing the fuse and removing the bursted capacitor the...


Only if the power supply has been restored back with the replacement of the capacitor and fuse can we proceed forward. If not you will need to check the SMPS unit to replace damaged components to restore the supply.
If supply seems correct, then check the +5 to the processor unit. In event of high voltage it is possible that the mother board is affected.

Jan 18, 2011 | Televison & Video

1 Answer

TV red light blinks seven times. Is this a code for the problem?


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

Oct 29, 2010 | Sony FD Trinitron WEGA KV-34HS420 34" TV

1 Answer

110v lcd tv was plugged to 22ov outlet


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.

Apr 12, 2010 | Sansui 19 in. LCD TV

1 Answer

I have an EIZO T962 CRT 21 inch monitor with bright screen. I can't adjust brightnes with conventional means ( adjusting via buttons). In the past I correct this problem on Sony trinitron 19 inch monitor...


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..

Oct 16, 2009 | Eizo FlexScan TX D7S Monitor

1 Answer

We have a Toshiba 52 inch TV, model # TP50G50, manafactor date on it is July 1997. The picture & the sound went out all at once, do you know if it's a fuse or something more serious? It's hard to haul...


It is a power supply fault. The power supply is a switched mode power supply and supplies 5 volts for the difital logic and high voltages for the high voltage parts of the tv relating to the screen display components. When the high voltage part of the circuit breaks or goes short circuit then the power supply shuts that part down leaving the low voltage rail of 5 volts..hence the standby still working. So... you need to be looking at the power supply board where the mains goes in but be aware of the mains voltages in this area if you arent experienced in electrics. The board will still hold 240v if the power supply has an open circuit load

Aug 02, 2009 | Toshiba Televison & Video

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