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Ca i ask what is the main cause of dead power supply on computers

Ca i ask what is the main cause of dead power supply on personal computers??
we have so may computer power supply that won't work, can you give me some tips on how to bring it ON and become useful

can you give the components that are causes the trouble

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Dust

Posted on Jun 25, 2009

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What is psu?


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A power supply unit (PSU) converts main AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use a switched mode power supply. Some power supplies have a manual selector for input voltage, while others automatically adapt to the supply voltage.

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Along the top of the picture on the screen is green, how can we get rid of this please.


You are saying about a horizontal green belt acorss the screen at the top. It can be due to main power supply [regulated power supply inside your tv]. Check it whether proper power supply is there or not. Normall it shuld be between 110 to120VDC. Different manufactures have different operating voltages. You should refer to the schematic digram of your tv.
An other cause ca be the lack of voltage, or improper voltage to vertical output section. I thing that you haven't replaced the deflection yoke of your tv till now. If deflection yoke have been replaced, convergence assembly at the neck of the picture tube should be aligned properly to rectify this probelm. Contact an experienced service personal. Ok.

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Ater the electric company spiked my house I am left with a CAL cl-15 blowing fuses and a Classe CA-201 with a dead left channel. Any thoughts?


Anything that blows a fuse has an overload caused by a faulty part. The suspects are the transformer, rectifier, voltage regulator and the large Electrolitic capacitors - all in the power supply section. In amps the devices on the heat sink can cause the fuse to blow.
Again the main suspect in the dead left device is also whatever is on the heat sink. However if can't hear any music etc playing even at full volume on the left you could have lost the left pre-amp stage, but I myself would stick to whatever is on the heat sink as the cause of the trouble.

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Had my tv looked at by a technician and they said it needed a new main power supply,it was to expensive to fix so i bought a power supply and instaled it but it dont work what can i do


Usually there is a warranty period like 30 days.Ask for a replacement if that dont work either there is another problem goin on.Then just ask for your money back,there is sometimes a restocking fee.

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Monitor just went off. no power light. changed fuse but monitor is completely dead


possibly a power surge killed the main board in the LCD. if the fuse was blown i would suspect a power surge. you could replace the circuit board. either that died or the power supply died- depending on if it has internal or external power supply that might be blown as well.

i would take it to a professional LCD/ LAPTOP repair person. they should be-able to test it and let you know what needs to be replaced

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Unit is dead ...


I have seen that model have bad capacitors on the power supply which will cause that symptom. Replacement parts are very hard to come by for Polaroid TVs, But I can post a link which may be able to locate or rebuild your power supply for you. Just leave them a email with your model number and symptom. Heres the link.
http://servicemanuals.vstore.ca/

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I have a NEC lcd1765 monitor that is dead!


Hi...there,
No power...usually caused by burnt out capacitors in the built-in power supply with inverter.

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Apple g4 digital audio Power supply API-9841


Solution: Replace power supply with a new one. Anything else might cause equipment damage, personal injury or death.

Any attempt for component level repair is not for the novice tinkerer. remember, opening the power supply might kill you.

My suggestion is to have the failed power supply module replaced with a brand new supply by a qualified repair technician.

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Busted component


Getting a schematic is rather doubtful. You might be able to get a general idea of the circuit from somewhere on the 'net.

Was the power supply dead?

ATX style power supplies have both a standby and main section. The standby supplies a low current +5 volts to a small portion of the motherboard.

If the component failure is in this section, this standby voltage will be missing or incorrect, and the computer will be dead- won't power on at all.

I've seen a number of catastrophic failures in this standby circuit, and repair isn't suggested or economically feasible, especially as some parts often poof beyond identification.

When the pwr button is pushed, the main section comes on, and supplies +5 (Red wires), +12 (Yellow wires), +3.3 (Orange wires), -5, -12. Look here for this info http://pinouts.ru/Power/atx_v2_pinout.shtml

Voltages are precisely regulated, and any substantial deviation (more than a few 10ths of a volt) indicate a problem, especially on the +5 & +3.3 lines.

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Dead mother board


The problem with power surges, or low power (brownouts) causing excessive current draw can cause multiple problems to motherboards. Even if you were to pinpoint and repair one problem that appeared to fix the fault, several other components on the board may have been weakened, and prone to fail.

If you are certain that the power supply is 100% ok, then replace the MB.

The best power protection is to use a UPS.

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