Question about Lite On (PA41519B1) 150-Watt Power Supply

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FAULTY POWER SUPPLY FOR LITE ON PS -5251-2DS

NO DC VOLTAGE READINGS FROM THE 20 PIN MAIN POWER CONNECTOR

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When connected the AC power , no DC voltage reading from the p.s.

what to do?

how can i turn it on?

Posted on Nov 24, 2008

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I have not yet solved it.I measured the suspected transistor attached to the heat sink , its ok.Iam still troubleshooting.

Regards,

FRANCIS

Posted on Oct 05, 2008

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Green LED on board is on but computer will not start


1) Check to see if the problem is the Power On switch, or the Power Supply, first.

Use a multimeter on the two wires coming from the Power On switch.
Perform a continuity test of the switch.

How?
An economical multimeter can be purchased, for as little as $8 to $12. Available in a multitude of stores. An auto parts store is but one example.

Make notes, and a drawing as to where those two wires go, on the Front panel header, on the motherboard. Then disconnect the two wires, and hold them in your hand.

Set the Function knob of the multimeter to OHM's. (1K, or 10K)
Touch the Positive (Red) probe lead of the multimeter to one wire.
Touch the Negative (Black) probe lead of the multimeter, to the other wire.
Press the Power On switch. (Button)

You should see a brief reading on the multimeter scale. (Or readout if the multimeter is digital)
It is brief because the Power On switch is a Momentary Contact Switch.

No reading? Bad ATX power on switch,

http://www.directron.com/atxswitch.html

Good reading? The Power Supply may be bad.
Test the three main voltages coming from the Power Supply.

[NOTE*
The Switched-Mode Power Supply, (SMPS), in your computer, is a power converter. It converts AC electricity from your home, or business, into three LOW DC voltages.

The shock hazard is IN the Power Supply's case. Not from the low DC voltages it produces ]

A) 3.3 Volt power rail
B) 5 Volt power rail
C) 12 Volt power rail

Test at the 20-pin ATX main power cable's connector,

http://usa.asus.com/Motherboards/AMD_Socket_754/K8VX_SE/

Photo, shows the white, long 20-pin ATX main power cable connector, on the motherboard. No power cable plugged in.
Two rows of 10 socket holes.
(Above the blue Heatsink that sits on the Northbridge chip )

This is a general example of a 20-pin ATX main power cable, and it's respective connector on the motherboard,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

Power cable plugged in as shown in the right photo.
I suggest using a straightened out paper clip, and sticking it down in the socket for the power wire.
This is for the Positive (Red) probe lead of the multimeter, to touch to.

First voltage power wire check:
The multimeter function knob is set to DC Voltage. If just a symbol, the symbol is a dotted line, over a solid line.
IF there is more than one DC Voltage scale, for the Function knob to be set to, set it to the 0 - 50 Volt scale.

The straightened out paperclip, will go down into the BACK of the 20-pin ATX main power cable's connector, RIGHT NEXT to the Orange wire.
Has to go down far enough, to go past the Orange insulation of the wire, and TOUCH the metal terminal down in the bottom.

[Looking at the middle photo, you can see the tips of the metal terminals I am referring to.
Uninstalled, and end not crimped over the wire's insulation, this is what they look like,

http://www.molex.com/molex/products/datasheet.jsp?part=active/0002081202_CRIMP_TERMINALS.xml&channel=Products&Lang=en-US

Left side shown, crimps over the insulation of the wire.
The far right side is what you are seeing the tip of, in the middle photo of the Playtool link ]

You can use ANY of the Orange wires you see. ALL are 3.3 Volt wires.
The Negative (Black) probe lead of the Multimeter, touches ANY Black wire.
ALL Black wires are Ground wires.
(Straightened out paperclip, also goes down in the Black wire's socket hole )

Put the straightened out paperclips in the appropriate socket holes, then plug the Power Supply into power. Press the Power On button, and start the Power Supply.

On the DC scale of the multimeter you should be reading VERY close to 3.3 Volts.

Good?
Go to ANY Red wire. ALL Red wires are 5 Volts (DC)
Positive (Red) probe lead of multimeter to straightened out paper clip, down into a socket hole, with ANY red wire.

Negative (Black) probe lead of multimeter to straightened out paperclip, in ANY socket hole with a Black wire.
Reading should be VERY close to 5 Volts. (DC)

Good?
Go to ANY Yellow wire. ALL Yellow wires are 12 Volts. (DC)
Reading should be VERY close to 12 Volts. (11.5 to 12 Volts)

ANY low reading means a bad Power Supply.

Primer:
1) If ALL of the LED lights were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can use 51 to 125 watts of power.

From your brief diagnoses it looks to be a bad Power Supply.
barely enough to light the green LED light on the motherboard.
Not enough power to even spin fans, much less turn the Processor on.

Power Supply checks out?
Perform a visual check of the Electrolytic Capacitors on the motherboard. Look CLOSE, and you may need a light, and magnifying glass.

http://www.capacitorlab.com/visible-failures/index.htm

Capacitors on the motherboard are used as Filters, and Voltage Regulators.
The one's used as voltage regulators, are in the motherboard voltage regulator circuit.
Some of the one's used in the motherboard voltage regulator circuit, regulate voltage for the Processor.

A Processor MUST have a steady, 'clean', supply of Voltage, and it MUST be kept within a very 'tight' tolerance range. Cannot be too much, or too little, or BIOS will not turn the Processor on.
(Or if on, will not keep it on)

That's an old motherboard. Could be bad capacitors, but I'm more willing to bet on a bad Power Supply.

For additional questions please post in a Comment.
Regards,
joecoolvette

Jul 23, 2012 | ASUS K8V-X SE Motherboard

1 Answer

I have an old Hp Pavillion 505n desktop computer. Has been working fine for years. Awhile ago it would not turn on at all. The disk drive lite would flash on and off a few times then nothing. I removed the...


That 4 pin plug generally supplies power to the processor. It depends on the processor type. Unfortunately the next step in troubleshooting is to replace the motherboard or the processor and there really isn't a good way to know which one first.

Jul 29, 2011 | Computers & Internet

2 Answers

Cannon-3300 Copier Error code E000-0000 rectify the problem


E000 0000
The reading of the main thermistor does not reach 30°C 1 sec after the main
power switch is turned on. Or, it does not reach 70°C 2 sec thereafter.

Main cause:
The fixing film unit is faulty. The main thermistor has an open circuit. The
fixing heater has an open circuit. The main power supply PCB is faulty. The
DC controller PCB is faulty.

Caution:
To reset the error, execute the following in service mode:
COPIER>FUNCTION>CLEAR>ERR.

Action:
1. Connector
Is the connector of the fixing assembly connected?
a. main power supply PCB (J8) <-> relay connector <-> heater
b. DC controller PCB (J320) <-> relay connector <-> thermistor
NO: Connect the connector.

2. Fixing film unit (thermistor)
Check the interval between pin 1 and pin 2 and between pin 3 and pin 4 of
the connectosr (4-pin) of the thermistor for electrical continuity. Is it ¥W
(open)?
YES: The heater has an open circuit, or the thermal switch is open. Replace
the fixing film unit.

4. Main power supply PCB, DC controller PCB.
Press the Start key. Is the drive voltage of the heater supplied by the connector
J8 of the main power supply PCB?
Main heater: between J8-1 (FSR1) and J8-5 (FSR COM)
Sub heater: between J8-3 (FSR2) and J8-5 (FSR COM)
YES: The heater drive power supply is faulty. Replace the main power
supply PCB.
NO: The thermistor control mechanism is faulty. Replace the DC controller
PCB.

Jan 18, 2011 | Canon imageRUNNER 3300 All-In-One Laser...

1 Answer

I am looking at a Dell Dimension 4550 PC for a friend and it won't boot up...i push the power button on and there is an almost orange/greenish light on the power button... no beeps no diagnostic lights are...


Bad Power Supply. Weak voltage power rail.

[There are three main voltages produced by the Dimension 4550's Power Supply.
1) 3.3 Volts
2) 5 Volts
3) 12 Volts ]

The Power On button LED functions as a diagnostic light also.

Dell Support > Dimension 4550 > Service Manual,

http://support.dell.com/support/edocs/systems/dim4550/

Left-click on Solving Problems, then click on Power Problems

The Power Supply is just an ATX form factor version. The common Power Supply form factor used in MANY desktop computers.
(ATX form factor for a Power Supply refers to the size, and shape of the Power Supply's case.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall)

HOWEVER, (Not shouting), there is an area of concern, should you try a Power Supply you may have available for a test, or purchase one.

It involves the wiring of the 20-pin ATX main power cable. More specifically the power cable's connector.

To explain view the standard wiring, set for a 20-pin ATX main power cable's connector,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

Looking at the photo to the far right, observe the color code of the wires, going down into the socket holes of the connector.

Look at the Lock tab on the side of the connector. This will help you orient the color code of the wires, and their placement in the socket holes, to the chart below the photos.

The connector on the end of the 20-pin ATX main power cable, is a Male connector.
Where the wires go into the connector, is the Back of the connector.
In the middle photo you can see the Front of the connector.

The wires going down into the ATX main power cable's connector, end in a female metal terminal.
The connector on the motherboard, (Shown in the photo to the Left), has Pins.
The metal female terminals go over the Pins.

The pins are numbered. The color code of the wires match up to the pins.
This is shown in the chart.

Now look at Dell Support > Dimension 4550 > Technical Overview > DC Power Connectors >
DC Power Connector P1

http://support.dell.com/support/edocs/systems/dim4550/techov.htm#1101897

The illustration may not be accurate. You'll have to compare since you have the computer, and Power Supply in front of you.

For a time period Dell was a Proprietary manufacturer.
Meaning they wanted THEIR parts used on THEIR computers, and ONLY THEIR parts.
They had the motherboard manufacturers make motherboards according to their specs.

One of the specifications was that the pins would be CHANGED around, in the motherboard connector for the ATX main power cable.

They also had Power Supply manufacturers make the ATX power cable to their specifications.

This means if a user bought an aftermarket Power Supply, the color code of the wires in the ATX main power cable would Not match.

Many users did buy an aftermarket Power Supply, and installed it.
Burnt motherboards, fried Processors, and graphics cards, resulted.

Orange wires are 3.3 Volts
Red wires are 5 Volts
Yellow wires are 12 Volts.
Black wires are Ground wires.

Guess what happens when you plug a 12 Volt wire into where a 3.3 Volt, or 5 Volt, or Ground wire is supposed to Be?
POOF!

My suggestion would be to look for a Power Supply that is an ATX form factor, is KNOWN to be good, and is compatible, for a test unit.
You, or someone you know may have upgraded to a better computer, and you may be able to borrow the Power Supply for a test unit.

Compatible:
Has the Correct power cables.
1) 20-pin ATX main power cable, OR a 20/24-pin ATX main power cable.
(20-pin connector that has an additional connector with 4 pins. Just use the 20-pin)

2) 4-pin ATX +12 Volt power cable. (Also referred to as P4 MB, and P4 ATX 12V)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

(Power for the Processor)

3) Enough standard 4-pin Peripheral power cables.
(Misnomered as Molex)

http://www.playtool.com/pages/psuconnectors/connectors.html#peripheral

(Power for the IDE Harddrive, and Optical drive/s)

Also:
You can change the power wires around in the ATX main power cable's connector.
Change them around, in an aftermarket Power Supply's ATX main power cable's connector.

Want to know how post in a Comment.

Oct 09, 2010 | Dell Dimension 4550 PC Desktop

2 Answers

I HAVE A CANON IR 3300 MACHINE I HAVE ERROR E00000-000


WHAT: Either the main thermistor doesn't attain 30?C 1 second after the power switch is activated or it doesn't attain 70?C 2 seconds thereafter.

WHY: It has a faulty fixing film unit, lack of connectivity with the main thermistor, lack of connectivity with the fixing heater, a faulty main power supply PCB, or the DC controller PCB is faulty.

NOTE: You can reset the error by performing the following in service mode: COPIER>FUNCTION>CLEAR>ERR.

CONNECTOR FIX: Make sure that the connector of the fixing assembly is seated.
A. main power supply PCB (J8) relay connector heater
B. DC controller PCB (J320) relay connector thermistor

FIXING FILM UNIT (THERMISTOR) FIX: With a multimeter, check the interval between pin 1 & pin 2 & between pin 3 & pin 4 of the connector (4-pin) of the thermistor for electrical continuity. A result of ?? means that the circuit is open (lack of connectivity). Resolve this by replacing the fixing film unit.

MAIN POWER SUPPLY PCB, DC CONTROLLER PCB FIX: Press the Start key. If the drive voltage of the heater is supplied by the connector J8 of the main power supply PCB, then the main power supply PCB should be replaced. If not, then the thermistor control mechanism is faulty & the DC controller PCB should be replaced. Use the following to ascertain this:
Main heater: between J8-1 (FSR1) & J8-5 (FSR COM)
Sub heater: between J8-3 (FSR2) & J8-5 (FSR COM)

Sep 25, 2010 | Office Equipment & Supplies

1 Answer

Does Codegen PS-450W PSU have connector PCIexpres with 6 pins or less_ Thank You


from what i see, I dont see a pciexpress power connector and I read it does not have SLI capabilities. so I believe no is the answer, sorry.
Features
Connectors 1 x Main connector (20+4 pin)
1 x 12V (P4) (8 pin)
7 x peripheral

1 x SATA
2 x Floppy

Aug 12, 2010 | Codegen (PS-450W) (PS450W) 450-Watt Power...

1 Answer

I would like to know how to troubleshoot a brand new Ultra LS600 power supply. I would like to go beyond hearing "it's dead" since I am getting power to the motherboard (via indicator light)m but the PSU...


You can start the PSU manually with a paper clip.
Remove the 20 pin connector from the motherboard, leave the four pin power connectors attached to your various drives (this will provide a load on the power supply when it start up (provided it is not faulty).
Look at the 20 pin connector with the connector facing you.and the locking clip to your left.
The fourth pin from the bottom LH corner should be a green colour wire and the next two wires (5th & 6th pin) should be black and next to the locking clip.
Straighten a paper clip and insert it into the 4th pin and into the 5th or 6th pin (ie connect these wires together). These wires connect to the front panel switch to turn on your computer. You are testing the power supply only and since it is not connected to the motherboard the computer won't start.
Now connect the power unit to the mains and switch on the mains, if the power supply is OK the PSU fan should spin up and your hard disk should also spin up. If nothing happens the the PSU is faulty.
You can test the +5volts and +12volts supply on a 4 pin power connector with a multimeter. The red wire is +5volts and the yellow wire is +12volts and the black wires are negative (ground). The voltage readings should be within 5% of these voltages.
There are other voltages to be checked +3volts, -5volts, & -12volts. but these are not as critical.

Dec 05, 2008 | Ultra Products Ultra LS600 Lifetime Series...

1 Answer

No Power


Dear Sir,

I assume, you have voltmeter with you.
Set VOM to DC 20 V range.
Remove the Power Supply from cabinet. Be sure you have proper earth in your house/workshop.
On the 20/24 pin main connector of your power supply, short the pins carrying green & black wire.
Hook your voltmeter -ve on any black pin of the connector permenantly.
& then connect the mains power cord to your power supply.
If your power supply is ok, this shall start the fans of the power supply on & running. Now you can check the voltages on different pins. There is a sticker on your power supply showing the normal voltages on every wire.
If you don't see any / normal volatges, your power supply needs repairing. You can buy a new one/ repair existing.

Jun 17, 2008 | Silverstone SST-ST405 (SSTST405) 400-Watt...

1 Answer

IR 2000


Fuser error probally needs fuser replaced and the reset as below

try this

1. Hit Additional Functions Key
2. Hit # key
3. Arrow to number 7, Printer and hit Set
4. Arrow to number 4, Printer Re-Set and hit Set.
5. Yes, re-set printer (hit minus key - back arrow).
6. Unplug the machine and plug it back in.

or this is explaination of the error and required fix from service manual.


E0000000
The reading of the main thermistor does not reach 30°C 1 sec after the main
power switch is turned on. Or, it does not reach 70°C 2 sec thereafter.
Main cause The fixing film unit is faulty. The main thermistor has an open circuit. The
fixing heater has an open circuit. The main power supply PCB is faulty. The
DC controller PCB is faulty.
Caution To reset the error, execute the following in service mode:
COPIER>FUNCTION>CLEAR>ERR.
Action
1. Connector
Is the connector of the fixing assembly connected?
a. main power supply PCB (J8) <-> relay connector <-> heater
b. DC controller PCB (J320) <-> relay connector <-> thermistor
NO: Connect the connector.
2. Fixing film unit (thermistor)
Check the interval between pin 1 and pin 2 and between pin 3 and pin 4 of
the connectosr (4-pin) of the thermistor for electrical continuity. Is it ¥W
(open)?
YES: The heater has an open circuit, or the thermal switch is open. Replace the fixing film unit.
4. Main power supply PCB, DC controller PCB
Press the Start key. Is the drive voltage of the heater supplied by the connector J8 of the main power supply PCB?
Main heater: between J8-1 (FSR1) and J8-5 (FSR COM)
Sub heater: between J8-3 (FSR2) and J8-5 (FSR COM)
YES: The heater drive power supply is faulty. Replace the main power
supply PCB.
NO: The thermistor control mechanism is faulty. Replace the DC controller
PCB.

Nov 18, 2007 | Office Equipment & Supplies

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