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What is psu? - HP Pavilion a1253w Notebook

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Power supply unit computer
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.

Posted on Nov 22, 2015

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Posted on Jan 02, 2017

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My smps fan not roatating. what happens if it is not roatating?


It may be that you PSU will overheat. It depends on the features of your PSU as to what the consequences of this are.
Some PSUs are equipped with a thermal cut-out in which case your PSU will simply turn itself off. Others will overheat, and internal damage to components will ensue, and your PSU and possibly your computer will cease to function (permanently). Your PSU may just catch fire in the worst case.
However, it may also be that your SMPS fan is thermally activated and only comes on when the PSU temperature is greater than some threshold; this is a design feature of the PSU if it is present. Some fans are equipped with a speed con troll that links the speed of the fan to temperature of the PSU. See you PSU details to determine which of the it may be. If it is a Zalman brand PSU, most likely it has a themally controlled fan. This feature also has propriety names such as "Silent Fan Technology" or "Whisper Fan"

18.April.2014

Apr 13, 2014 | Computers & Internet

Tip

How to test an LCD TV or monitor PSU and inverter


Hi.

Before proceeding I assume you have technical training along with the multimeter. A full testing must be done with power on, and for safety reason must not be done by an untrained user.

The tip contains only general indications. The reader is supposed to have the training to apply in practice the testing method below.

If there is no power at all, then the responsible is almost always the PSU.

When there is no power, test AC in to PSU. If there is no AC in (read volts, or read ohms on power cable), that means that the power cord must be replaced.

If there is AC in, then test the PSU section near to AC input. You always find a resistor or a fuse in there . Check if it has blown.
After that you test the rest of PSU component. If there is no power at all , and problem is not power cord, it is often possible to spot at a glance a leaky or bulged capacitor.

If there is power, but the monitor stays in standby, then te PSU is forced to low voltage only by controller board. This happens when a fault had been detected.

In this case testing the PSU becomes more complicate. The technician must locate the control lines from controller board. This control lines operate at lower PSU voltage (often +5V), and turn on higher voltages on PSU board.

The inverter may use for example a +20V line from PSU. The +20V line is turned on by the controller board, closing a +5V control line to PSU. When PSU is in standby mode, the technician testing the PSU must bridge the +5V line with the PSU low +5V circuit, and test if the +20V line to the inverter gets turned on.

As explained this kind of test must not be done by the unexperienced user, as the chance to waste the unit beyond repair is high, and there are also many safety concerns.

After testing the PSU, next part to test will be the inverter board.

The inverter is tested reading DC voltage in from controller board, and AC out to back light system.
The inverter is an high voltage board, remember, safety first when testing AC circuit.

If the inverter has no DC from controller, then test PSU, if PSU is OK, and inverter has still no DC in when PSU line to inverter is on, then replace controller board.
If the inverter has DC in, and no AC out, then replace the inverter.
If the inverter has DC in and AC out when higher DC voltage to inverter is turned on, then test at component level the main controller board, and if present test LCD controller.

Regards.

on Mar 03, 2010 | Televison & Video

1 Answer

Asus P5GC-MX/1333 system wont boot up, motherboard light on (blinking), fans on PSU not working, fan on motherboard not working, is that a sign PSU went bad? (it was OK a few days ago)


yes
it can be problem wth psu hence insert a wire in green socket and another in black socket of psu and this will short and psu fan will rotate. if psu fan rotates then you need to check the voltage supplies of the psu.

Apr 01, 2014 | ASUS Computers & Internet

1 Answer

Looking for circuit for Dell inspiron 1520 to trace power from psu, it isnt reaching the computer or battery could be protection diode ( if there is one)


I'm not sure how you checked the PSU but it is often the case that the voltages measure correctly but the PSU still will not work in the computer. I had one recently.

I would buy a new PSU and replace it. If it still does not work, you can return the PSU. Unless you have a complex PSU tester, I would put my money on the PSU being defective.

Sep 02, 2012 | Dell Inspiron 1520 Motherboard

2 Answers

Power supply not powering on


mine 2 psu running doesn't. false where knowing won't am i?

Aug 08, 2012 | HP Compaq 6000 Pro Microtower PC (NV504UT)...

1 Answer

I turned on the TV and it popped and went off and will not come back on


Hi.

When that happens you have usually blown the PSU. The power supply is the board connected to the power cord. If there had been a pop sound, power went off, and now TV is completely off, then the PSU has blown.

There is a 6 Amp 125 VAC fuse in the AC section of the PSU, that is the first part to check.After that test the PSU. Sometimes it is even possible to spot a blown capacitor in the PSU board. They look bulged, sometimes burnt and in some case you can even see a leak. Sometimes is instead possible to see a burnt area that is revealing a short, often in the AC section of the PSU. The PSU is located at the back of the TV. Power must be disconnected before removing back panel. Do not touch PSU. Capacitors can store and release heavy discharge even with power cord not connected. There are also 3 small brown fuses located next to the flyback. Those can be tested using a multimeter. Testing must be done by a trained person.

The PSU cannot be easily replaced with a new one. The part is not in stock anymore (part number was 264102), and it is not even easy to find on Ebay. The PSU must be repaired.

Regards.

Ginko

May 24, 2011 | RCA HD52W59 HDTV Projection Television

1 Answer

When I put the plug into the PSU for my sony tower pc the green indicator light just keeps flashing. Now when I unplug the 24 pin connector from the mother board the light on the PSU is steady green. What...


the PSU has Problem . It is not supplying enough voltage to boot the PC, capacitors inside the PSU are weak or damaged. Its dangerus to open the PSU coz, Capacitors have high voltage currents. If you have the Knowledge of electronics, then open the PSU and detect the Weak or Leeky Capacitors and replace them with new one( this method is for experiment and thrill) . But the replacement new PSU is better , perfect and cheaper then repairing the psu from outside. best of luck

Feb 03, 2011 | Gateway Bestec ATX-300-12EB3 305w Power...

1 Answer

Psu


usually any PSU will fit as long as you dont have a odd case. you can even take out ur old PSU take it to a best buy, circut city, and fry's electronics and ask them for n higher watt of the PSU u already have.

Oct 17, 2008 | E-Machines Computers & Internet

1 Answer

Philips IQON


Check your Power Supply Unit..(PSU) It has most probably "Faulted". BUT first remove all cards... disconnect all Hard Drives, CD/DVD's etc.. try to power on... if still no-go then ya PSU IS Definitely faulty. Replace. If it DOES go, then, simply plug in each removed device and turn on again, in turn,... until it will NOT power on & that device, will be your "Faulty" bit.. replace that device/card etc. & NOT the PSU. The PSU's are fairly inexpensive these days. To replace ya PSU, open up ya PC... Disconnect the PSU's Plug from Motherboard. Unscrew the Four (4) Screws from PSU, from the rear, near fan. To install is simply the reverse process... Screw the PSU into place..connect up the Plug onto the Mother Board.. ya done.. Power On.

Sep 03, 2007 | Computers & Internet

1 Answer

Newly installed, first boot up PSU problem


If it's a new PSU, then return it for a replacement...Even online distributors will replace faulty units. And since your old PSU works on it, I'd have to say it's the new PSU that's faulty. Did you make sure that it's the right PSU for the CPU that you have? (As there are PSU units for AMD and seperate ones for Intel...Intel just has a additional power cord to connect to the motherboard)

Apr 06, 2007 | RaidMax Aurora RX580 (RX580F) 580-Watt...

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