Compaq EVO D510 POWER SUPLY PROBLEM

[coolcurrent]

Hello guys,

my compaq system won't turn on. it simply shut off while working with the two led lights in the front full on. the processor fan and the power supply unit fan are constantly running.

i already did some troubleshooting on the system, but no success.

i suspect the power supply unit, but need guide on how to fix it. am average electrical electronics engineer, and would appreciate any help that can confirm the PSU good or bad

Thanks

[retiredcaps]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

i suspect the power supply unit, but need guide on how to fix it. am average electrical electronics engineer, and would appreciate any help that can confirm the PSU good or bad

If you have a multimeter, see if pin 9 (purple) as per

http://en.wikipedia.org/wiki/ATX

is outputting a stable 5V DC.

[delaware74b]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

Is the D510 a SFF (small form factor) or the mid-ATX form factor. Good clear photos can help us to help you.

I have a couple of the D510's in small form factor and -can- spare a power supply, but I haven't seen a power supply failure.

Most of the failures I've seen in the D510's is bad caps due to heat build-up and bad Nichicon HM's dated '02 to '04.

[delaware74b]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

I've attached photo's of a D510 SFF (small form factor). This particular model uses a nonstandard power supply connector although it does have the 4-pin 'P-4' connector.
As you can see, this mobo needs a re-cap especially in the VRM section. It won't even boot, I've resurrected 2 in worse shape than this one by recapping it.

[coolcurrent]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

Is the D510 a SFF (small form factor) or the mid-ATX form factor. Good clear photos can help us to help you.

I have a couple of the D510's in small form factor and -can- spare a power supply, but I haven't seen a power supply failure.

Most of the failures I've seen in the D510's is bad caps due to heat build-up and bad Nichicon HM's dated '02 to '04.

i have attached two photos, i hope its clear enough.

its Compaq d510 SFF p 2.4 GHz.

the problems is that the two small green light remains on immediately i power it on for ever until i power it off. it doesn't boot at all

[coolcurrent]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

I've attached photo's of a D510 SFF (small form factor). This particular model uses a nonstandard power supply connector although it does have the 4-pin 'P-4' connector.
As you can see, this mobo needs a re-cap especially in the VRM section. It won't even boot, I've resurrected 2 in worse shape than this one by recapping it.

ok can you give me step by step guide as to how to recap my cpu

[coolcurrent]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

If you have a multimeter, see if pin 9 (purple) as per

http://en.wikipedia.org/wiki/ATX

is outputting a stable 5V DC.

the compaq SFF power supplyunitis not tha same as the standard atx pinouts.

The compaq SFF has 14 pins, while atx has 24 pins.

is it possible to convert an atx power to the SFF. please help me with guide

[weirdlookinguy]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

Do some searching around these forums and on the badcaps.net home page. Lots of excellent guides to recapping.

Before any of that though, we need to determine if your PSU is working properly or not.

[coolcurrent]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

Do some searching around these forums and on the badcaps.net home page. Lots of excellent guides to recapping.

Before any of that though, we need to determine if your PSU is working properly or not.

ok, thanks.

but i hope bad caps may not be the culprit, if so, how do i test and fix th PSU?

[delaware74b]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

Here is the pinout for the power supply in the EVO D510 SFF:

http://pinouts.ru/Power/compaq_pdp_power_pinout.shtml

I hope this helps

[coolcurrent]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

thanks for the pinouts, let me check the voltages

[coolcurrent]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

i just read the voltages with all wires from the PSU disconnected from the mainboard

pin 1 2 3 4 5 6 7
v 0 0.8 2 0 5 0.8 0

pin 8 9 10 11 12 13 14
v 0 5 0 0 0 0 0

the 0s simply means there wasn't an deflection on the multimeter, so what do i do now?

[delaware74b]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

Does the power supply start up when you attempt to start the computer (power supply fan spin)? If so, try to read voltages on:
brown +3.3 volts
red +5 volts
orange +12 volts
blue -12 volts
pink +3.3volts

PM me if interested in a power supply. I can spare one if you are in US

[shovenose]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

are there any bad caps on the mobo or in the power supply? that would be the first thing to check.

[coolcurrent]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

Does the power supply start up when you attempt to start the computer (power supply fan spin)? If so, try to read voltages on:
brown +3.3 volts
red +5 volts
orange +12 volts
blue -12 volts
pink +3.3volts

PM me if interested in a power supply. I can spare one if you are in US

When power supply is connected to cpu and power cable plugged in, two green led on the mother board comes on.

One of them goes off when i press the power button, the two green led in front of the system turns on and stays on, the PSU fan starts spinning and the processor fans too without stopping

with the power supply not connected at all to the cpu and the voltages read, i have this

pin=volts
2=+0.8v
3=+2v
5=+5v
6=+0.8
9=+5v

should i connect all power supplu cable and reread their values?

[coolcurrent]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

are there any bad caps on the mobo or in the power supply? that would be the first thing to check.

No , i dont see an swollen or bad caps on the motherboard or PSU when opened

[shovenose]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

hm, ok.
ps: swollen=bad

[delaware74b]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

What brand/series caps are around your VRM/CPU socket? If they're Nichicon HM's, blanket recap the board as a starting point. I know all 4 D510's that were given to me had HM's that are in the 'bad' date codes and are swollen.

[coolcurrent]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

the brands are RUBYCON CAPs although i have three Nichicon HM's 1000uF 25v close the the four pin socket from the PSU

[shovenose]

Re: Compaq EVO D510 POWER SUPLY PROBLEM

what is the hm caps date code?