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PC smps power supply problem

I have to repair smps of pc.
make of smps is EMACS
model no- PSL -6701P
not working output voltages
input is OK

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Ok you open the pcb check the fuse first then replace it if faulty if it burns again then check 4 diodes then see if 200v big capacitor is expanded or not if so then replace it if not then check diodes after transformer if short then replace it

Posted on Nov 21, 2008

  • pravin bhavsar
    pravin bhavsar Nov 21, 2008

    look the short ckt in smps anywhere


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Good very helpful

Posted on Jan 26, 2009

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My orion tv model number sled4668w just went black no sound no picture

Two possible faults:
1. Fault to the main power supply regulator [SMPS] section circuit. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician.
2. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.

Jul 11, 2015 | Orion Televison & Video

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Computer smps not work properlly what problem

More than likely a bad voltage power rail, balanpv38.

Also more than likely caused by bad Electrolytic Capacitors inside the Switched-Mode Power Supply.

Radial Aluminum Electrolytic Capacitors.

Capacitors in the Output Stage, more than likely.

Capacitors are used as Filters, and Voltage Regulators. In the Input Stage of the SMPS they are used as voltage regulators. In the Output Stage they are used as filters.

Filter the rectified AC voltage, which is now DC. They make the DC voltage 'clean'. No ripples, clean DC voltage.

The two large blue sleeved Radial Aluminum Electrolytic Capacitors, you see marked with the letter B, can store Up To 100 Volts.
They are in the Input Stage.

IF, your fingers touch the terminals (2) on the bottom of the capacitor/s, YOU could receive the stored charge. Result is a Bad shock to FATAL.

IF, your fingers complete a circuit, that one or more capacitors are in, YOU could receive all of their stored charge. Result is a Bad shock to FATAL.

Capacitors need to be PROPERLY discharged before working on the unit.

This is hwy I cannot guide you in this endeavor. I will not guide you with the slightest possibility of you getting hurt.

Suggestion is to replace the Power Supply.

What can make a Power Supply go bad?

1) Low quality electronic components inside.

A) Low quality Radial Aluminum Electrolytic Capacitors
B) Low quality Power MOSFET/s
C) Low quality Rectifier Bridge
D) Low quality wiring due to the gauge of wiring used is too small.

2) Power Supply, (And inside of computer), is dirty inside.

An SMPS (Switched-Mode Power Supply), has two cooling components inside;

Heatsinks, and a small internal fan.

In the Wikipedia link of the open SMPS above, there are two Heatsink's used in this particular example;

One is in-between the letters B and C, and one is in-between the letters C and D.
Rectangular finned shapes connected by a vertical bar.

The Heatsink absorbs heat from whatever object it is placed against.
The rectangular shaped fins absorb the heat, then radiate it away.
The small internal fan's air flow helps carry heat away from the fins.

If in-between the fins, and around the fins, is clogged with 'Gunk', the cooling capacity drops Tremendously.
('Gunk' = Dirt, dust, lint, hair, etc)

Heat = Wasted Energy
The Power Supply cannot keep up with the call for power, and components inside the Power Supply fail.


Sep 03, 2012 | Computers & Internet

1 Answer

Ive had this bluray player for 2 years and it was working fine, then one day i tried to turn it on and nothing happened. i checked if the fuse was blown but i appears to be fine. so there is no power...

there is possibility of two complaints.
1, The SMPS power supply fault
2. the mother board fault.
if the SMPS is faulty the you can rectify the problem. If it is with the mother board the you have to contact the manufacturer .
First of all you have to check the SMPS ( switch mode power supply). you have to check the voltages at it secondary stage. 5v, 12v, etc
switched-mode power supply (switching-mode power supply, SMPS, or simply switcher) is an electronic power supply that incorporates a switching regulator in order to be highly efficient in the conversion of electrical power. Like other types of power supplies, an SMPS transfers power from a source like the electrical power grid to a load (e.g., a personal computer) while converting voltage and current characteristics. An SMPS is usually employed to efficiently provide a regulated output voltage, typically at a level different from the input voltage
for checkin the SMPS voltaes you need a multimeter. And check the voltages at it secondary stage
Added the inside view of BD 1600

if there is no outputs from the smps then you have to replace the SMPS drive STR ic near the big capacitor. Also ty to replace the OPTO coupler ic. y have to check the all resistors near the ic.

Remember one important thing that the capacitor can hold charge for some time even if you disconnect the power. so after removing the power. remove the SMPS very carefully. discharged the capacitor using a bulb.
i have also added a video for SMPS working for you reference will hep you for repairing your one


Apr 07, 2011 | Samsung BD-P1600 Blu-ray Disc Player

1 Answer

I forgot to remove input power supply of etower. Whilst emachines etower power supply was still on, i accidently moved the voltage selection switch to a higher voltage. There was big bang and fire happend...

Hi, First, check your power supply fuse for damage and switch the power to standard. Disconnect power supply output port and check your output voltage. If nothing abnormal, turn off power supply, connect the output and turn it on to check the power on your PC

Dec 14, 2010 | E-Machines etower 566i PC Desktop

1 Answer

Can you reset a pc power supply

Is your question referring to resetting a Power Supply, as you would per se a surge protector?

In most cases No.
Most Power Supply's do not use a Circuit Breaker, nor a Fuse.
(May have to take that statement back, on some of the new Power Supply's though)

Once the Power Supply has gone bad, (Weak Voltage power rail, usually), it's time to buy a new one.

I find that Electrolytic Capacitors have failed, in most failed Power Supply's. However, that is just my general observation over the past 20 years.

Low quality Electrolytic Capacitors are used.
(Radial Aluminum Electrolytic Capacitor's)

These capacitors are used as Filters for the Power Supply. They filter the incoming AC electricity, and the outgoing DC electricity the Power Supply has converted.
(Input Stage, and Output Stage)

To wit:

The Power Supply used in a personal computer is an SMPS.
Switched-Mode Power Supply,

Here on the above Wikipedia page for SMPS, you will see a photo to the top right, of a typical SMPS.
You can click on the photo to enlarge.
(You can enlarge twice)

You are looking at a top view of a typical SMPS, that has the cover removed.
The large Electrolytic Capacitors, indicated by the letter B, are for the Input Stage.
The smaller Electrolytic Capacitors, indicated by the letter E, are for the Output Stage.

NEVER open a Power Supply, (SMPS), and try to work on it.

Even when a capacitor is removed from power, (Power Supply unplugged from power), the capacitors hold a charge for a LONG time.
Weeks, Months, sometimes over a year!

If your fingers touch the terminals on the bottom of a capacitor, (Radial Aluminum Electrolytic Capacitor), the charge could be released to YOU!

If your fingers complete a circuit that one, or more capacitors are in, the charge could be released to YOU!

The released charge can be a BAD shock to FATAL!

There are also MOSFET's, and Rectifier Bridge's that can go bad in an SMPS.

There is a Proper way to discharge a capacitor. I will not detail it here because of the safety issue to you.
The best method is to replace the Power Supply.

Tell me the computer manufacturer name, and Model Number, and I will look up what Power Supply it uses, if the info is available.
(90 percent of the time it is)

For any questions please post in a Comment.

Sep 13, 2010 | Computers & Internet

1 Answer

What are the outputs of the varios plugs & sockets of a Delta Electronics power supply model SMP-420BB when supplied with 230 volts AC input

Forget about the individual plugs. Concentrate on the wires.

The Delta SMP - 420BB is just another
Switched Mode Power Supply.

(SMPS shortened to SMP by Delta. I'm speculating here, but I'll bet the 420 stands for 420 Watts)

No matter what the input voltage is, the SMPS will only put out three main voltages.

1) Wires with Yellow insulation are 12 Volts
2) Red wires are 5 Volts
3) Orange wires are 3.3 Volts

ANY Black wire is a Ground wire.

For example:
1) 4-pin white Molex power cable.
1 - Yellow wire
1 - Red wire
2 - Black wires

(4-pin Molex power cable is also referred to as a Peripheral power cable)

Here is more in-depth info about the various power connectors, and power cables, used in a personal computer,

Jan 14, 2010 | Computers & Internet

2 Answers

I have a D946GZIS motherboard. It does not boot whenever i switch it on and press the power button. Also the power led is not glowing. What must be the problem..? pls help ..

Starting at the begining. The wall socket, the plug, the cable, the power socket on the SMPS at the back of your PC, the SMPS, the Output connectors from the SMPS to the motherboard. The power LED not glowing means that the power is not reaching the motherboard. Disconnect and reconnect the power connector on the motherboard. start. No start. Does the fan on the SMPS work? If yes then all components before the SMPS are doing fine. If no then most likely connection socket power cable to the SMPS may be the culprit. This has a lot of load on it. The PC and the monitor both take power from this socket. the answer to your problem lies in the answer to my question whether the fan starts in the SMPS or not. If yes then there is no output from the SMPS and the SMPS need to be given the due attention and if no then there is no power input to the SMPS and various cables and socketc need that attention. In case you need to and can remove and open the SMPS look for bulged or burst capacitors. If found, replace them. Those round cylindrical components.

Nov 27, 2009 | Intel D946GZIS Motherboard

2 Answers

Switched it off last night. this morning no power. won't switch on. not lead have tested. thanks

Verify whether the SMPS fan is working or not, working of this fan indicates that power output +12V is OK, if not you need to check the SMPS, probable reason SMPS fuse blown.
If you observe SMPS fan rotates for few seconds and then stops, this indicates minor repair is required, let me know the symptoms.

Oct 09, 2009 | Acer Power S290-EC3600P PC Desktop

1 Answer

I have customers overseas that have the EMACS HP2-6460P power supplies in their systems and they say that the systems do not shut down properly and they eventually unplug the power from the wall. What...


I would ask the customer a few questions:

1. Do you have the computer connected to a power adaptor or is it a voltage switching pc?

2. Has the pc always done this? If not, have you changed any power setting in the control panel? (Or have the checked the power setting.)

3. When was the last time the pc shut down properly? Maybe the pc is trying to install updates and need time to finish the install. (If when powering off the pc you see a shield over the power icon from the start menu, let the pc run its course and it should power on/off correctly.)

Good Luck

Aug 13, 2009 | HP2-6460P EMACS PS/2 460W Power Supply...

2 Answers

Power supply fan not turning

check the power cable to see if there is power supply,if yes then check the output voltage from the power pack where the power fan is housed for supply if no output then the power pack is bad and need s replacement

Sep 06, 2008 | E-Machines Computers & Internet

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