Samsung PN58C7000 wont power up

[tom66]

Re: Samsung PN58C7000 wont power up

That does seem very suspicious. It looks too low. It could be a problem with the main board. Is the +5.4V output on the connector doing anything?

[noahc72]

Re: Samsung PN58C7000 wont power up

Ok my mistake. Had the meter on ac. Bear with me, I haven't done much work with one.

Ps on is 17.4 then drops to around 2.5 when it clicks then goes right back up to 17.5. Similar with the 5.4v.

[tom66]

Re: Samsung PN58C7000 wont power up

Ok my mistake. Had the meter on ac. Bear with me, I haven't done much work with one.

Ps on is 17.4 then drops to around 2.5 when it clicks then goes right back up to 17.5. Similar with the 5.4v.

17.5V??? Is the battery good in your meter? Can you test an AA battery.

But for now assuming "17.5V" means a logic high signal, this means the main board is telling the power supply to turn off. So it is probably a problem with the main board.

[noahc72]

Re: Samsung PN58C7000 wont power up

1.6v on a new AA battery

[noahc72]

Re: Samsung PN58C7000 wont power up

Any other tests I can do on the main board before I order one?

[tom66]

Re: Samsung PN58C7000 wont power up

Any other tests I can do on the main board before I order one?

17.5V is definitely wrong then. And your meter seems good. I can't figure out how the PSU would output 17.5V on the 5.4V output without blowing something up on the main board - are you definitely measuring the right pin? I know some Samsung TVs have 16-20V outputs for the audio amplifiers.

[selldoor]

Re: Samsung PN58C7000 wont power up

Hi - can you post a pic of the two connectors legends.
One end looks like it says 1.8V but is it 18V in which case 17.5 is close.

Also here is a samsung plasma training manual - not for your set but some of the tests might be valid. Unplug
both sustain boards -tried that?

http://dl.dropbox.com/u/35219914/SAM...G%20MANUAL.zip

[noahc72]

Re: Samsung PN58C7000 wont power up

yeah, i just noticed it says 18v right on there

[noahc72]

Re: Samsung PN58C7000 wont power up

I did try unplugging the x and y boards earlier.

Is that not the main board in the lower right?

[noahc72]

Re: Samsung PN58C7000 wont power up

In that training manual troubleshooting page is AV the main board?

[tom66]

Re: Samsung PN58C7000 wont power up

The main board is the board with the inputs on it and the multiple heatsinked processors.

I think you are checking 18V pin, not PSON - it might be on a different row (awkward if so) - maybe try using a small wire and poking it in the pin connector and checking with a meter using that wire?

[noahc72]

Re: Samsung PN58C7000 wont power up

Ok, I am dumb. Ps on is at 0.12 then goes to 3.24 right after the click then back to 0.12. Pin right under it is at 5.25 and stays there.

[noahc72]

Re: Samsung PN58C7000 wont power up

All of the 5.3 pins are at 5.25 and go to zero after the click then back to 5.25

[selldoor]

Re: Samsung PN58C7000 wont power up

Yes damn-it its a doublerow socket thats why he got 17.5 for pson and 5V.
I think a wire stuck in is the only way


EDIT
Re next post - yes I saw as soon as I pressed post - I was just annoyed with myself as I didnt spot the 18v earlier

[noahc72]

Re: Samsung PN58C7000 wont power up

No I was checking the wrong one. Got the right one, see above

[noahc72]

Re: Samsung PN58C7000 wont power up

Ps on voltage is supposed to stay up right? Its not, so is it the power supply or main board that is the problem?

[budm]

Re: Samsung PN58C7000 wont power up

Yes, the PS_ON should be steady at 3Vdc or more.

[noahc72]

Re: Samsung PN58C7000 wont power up

Yes, the PS_ON should be steady at 3Vdc or more.

Always, or after it the tv turns on?

[tom66]

Re: Samsung PN58C7000 wont power up

This indicates the main board is shutting down the power supply, for some reason.

[noahc72]

Re: Samsung PN58C7000 wont power up

Ok, so a new main board should fix it then?