Question about HP DT PAVILION P6110f DESKTOP PC
Computer is connected to power. Pushing power on button does not power up computer. Is there an internal fuse or circuit interrupter?
No fuse. No circuit breaker.
You either have a bad Power On switch, or a bad Power Supply.
There is an easy test to see which one it is.
Bypass the Power On switch.
Does NOT involve the wires of the Power On switch.
HP Support > Pavilion P6110f Desktop PC > Main Support page,
Product information > Product specifications > Motherboard Specifications, IPIBL-LB (Benicia),
Looking at the right side of the motherboard, towards the middle; you will see a white long connector, that has two columns of 12 socket holes.
This is a general example of a 24-pin ATX main power cable, that plugs into that connector,
Looking at the photo to the far right, you see the power cable plugged into the motherboard. That's how we need it for the test.
See the Green wire? This is the Soft Power On wire. Abbreviated as PS_ON.
A jumper wire is used to Briefly connect that Soft Power On wire, to ANY Black wire. ALL Black wires are Ground wires.
The preferred jumper wire is a straightened out paperclip, bent into a U-shape. Turn the U-shaped paperclip over, and that is how it will be used.
The top of the U is wrapped a few times with black plastic electrical tape. (Or any color)
This taped area is for your fingers, and thumb to hold onto.
The 'legs' of the U go down into the socket holes, of the 24-pin ATX main power cable's connector.
The BACK of the connector is where the wires go in. The Back is where the jumper wire goes in also.
One leg goes down into the socket hole with the Green wire, RIGHT NEXT TO the insulation of the Green wire, and slides down into the socket hole.
It MUST go far enough down in that socket hole, to touch a metal terminal that is on the end of the wire.
Every wire going into that power cable connector, ends in a female Molex connector,
The other leg of the U-shaped jumper wire, goes down into ANY socket hole that has a Black wire in it.
Power Supply plugged into power, the U-shaped jumper wire is BRIEFLY used.
Contact period is no more than 2 seconds.
(The Power On switch is a Momentary Contact Switch)
The Soft Power On circuit uses 5 Volts DC.
In comparison two D cell flashlight batteries produce 3 Volts DC.
Not saying there won't be a spark however, dclipsitt.
You may wish to wear a glove on the jumper wire hand.
Power Supply comes on you have a bad Power On switch.
Power Supply does NOT come on you have a bad Power Supply.
Most of the time with an HP computer, the Green LED on the back of the Power Supply will be blinking, if the Power Supply is bad.
For additional questions please post in a Comment.
Posted on Jan 23, 2013
Testimonial: "I replaced the power supply with a higher capacity unit I picked up at Fry's this morning. Everything is back to normal. Thanks All..."
I've never seen or heard of a power supply unit (PSU) that has replaceable fuses or a circuit breaker. Usually, if they are working properly, they automatically reset and start up when any problem circuits are fixed (bad connections, overloaded, overheated, not connected). Usually, if it won't start, it is a bad PSU.
If PSU, CPU, and case fans turn on, the PSU is working. One other thing is required: the POWERGOOD signal in the PSU turns on. When this signal is not on, it keeps the CPU in a constant reset state. It turns on only after all the PSU voltages reach their correct levels. For example, it is possible that the +12v works the fans OK, but if the +3v for the motherboard is out of range, the POWERGOOD signal will not go on.
You can try another known good power supply to see if it works. If so, then you need a new PSU. If not, you've got to do full troubleshooting which requires experience.
Posted on Jan 23, 2013
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Posted on Jan 02, 2017
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