Spectroniq PLTV-3250 wont start

[EGuevarae]

Re: Spectroniq PLTV-3250 wont start

Oh, eguevarae, your question:

"160v DC? Are you sure? I'm not an expert, but so far I haven't seen that DC Voltage on any PSU."

It's entirely possible, since the PSU is "un-loaded", that you could get that on a sensitive VOM as DC with an AC (RMS) element to it. The line voltage, partly rectified (1/2 wave DC) with that big cap on it could certainly produce that voltage. A scope on that voltage would show the actual waveform and perhaps a clue as to what is going on there.

Toast

So indeed, this is more an ATX, computer-style SMPS, than a "regular" LCD PSU? I know that after the big cap and partially rectified voltage (half wave) there could be ("could be" because I'm not an electronics expert, I'm learning on the go...) at least a 120v (input V) half-rectified. The point here is that so far, I haven't seen that myself, either because I have not traced that back into the circuit or just I had checked ones with an external brick.
Good to have people around here that knows lots of things.
Thanks.

And that 1/2 w resistor might be the load required to start the ATX "engine", right?

[glen65]

Re: Spectroniq PLTV-3250 wont start

If you do, then a jumper from ground with a 150-250 ohm, 1/2 watt or better resistor should cause it to start. If you don't have a valid voltage, then your problem most likely lies farther back in the circuit.

A jumper from ground to which terminal?
Are you talking about connecting the resistor across the
5 volt line itself?

[Toasty]

Re: Spectroniq PLTV-3250 wont start

Just some FYI, before you go crazy trying to fix it. I know you have time, money, & sweat into the repair:

Saw 6 of these go on Ebay not 2 weeks ago for around $60 each.

Found this on the web: Electronica-USA.com

You might want to drop FSP Support a line and see if they can help.

Site: http://www.fspgroupusa.com/

and here's the page with this unit on it. You might get support to send you a schematic. Of course, with the correct amount of begging and pleading, you might get them to send you a new one since the TV manufacturer has bailed (see next bit).

BTW, this company SpectronIQ, is GONE. Saw lots of bad reports on the Ripoff Report site, this one regards their Chapter 11 filing.

Did you replace the defective caps with an equivalent type? I'm not just talking voltage and capacitance here. With an incorrect ESR, it could be they're not passing enough "juice" to kick the supply into oscillation.

Now, regarding the way to turn it on. Do you have any valid voltages at any of the outputs or connectors? I'd be looking for a good 5 volt line (or thereabouts) somewhere. Mind you, this should be a very low power (milliamps) supply voltage.

If you do, then a jumper from ground with a 150-250 ohm, 1/2 watt or better resistor should cause it to start. If you don't have a valid voltage, then your problem most likely lies farther back in the circuit.

Also, if you have the ability to reduce the input voltage (tapped isolation transformer or Variac) and bring it up slowly, by monitoring some voltages in the PSU you may discover that it starts to "come alive" and then collapses as you raise the voltage. That should give some clues as to what is failing.

Oh, eguevarae, your question:

"160v DC? Are you sure? I'm not an expert, but so far I haven't seen that DC Voltage on any PSU."

It's entirely possible, since the PSU is "un-loaded", that you could get that on a sensitive VOM as DC with an AC (RMS) element to it. The line voltage, partly rectified (1/2 wave DC) with that big cap on it could certainly produce that voltage. A scope on that voltage would show the actual waveform and perhaps a clue as to what is going on there.

Best of luck!

Toast

[EGuevarae]

Re: Spectroniq PLTV-3250 wont start

I am getting DC voltage at one of the
leads (about 160V)

160v DC? Are you sure? I'm not an expert, but so far I haven't seen that DC Voltage on any PSU.

Well, as for the power supply startup procedure, I don't know what to tell you. You are looking for someone like "connect a hard disk or a fan to the PSU, and then short the green cable (Power good) with one of the black ones (Ground) on the MB connector to turn the ATX PSU on"? If you look at this page , in the page title (IE7 Title bar in my case) you can see that it is referenced as a Flex ATX PSU, so maybe you are right and you need a procedure like that.
"Flex ATX Form Factor power supplies are general class of small form factor power supplies designed to provide flexibility in designing compact, embedded and portable computing devices. The Flex class include sub-types TFX, CFX, and LFX Form Factors, each focusing on a different market segment." (quote from here.
Have you tried connecting only the front panel/ control panel where the power on button is (like when you connect just the power on switch to test a computer Motherboard)? There are 4 connectors (besides the AC in one) in there. Can you connect something (load) to one of them?
I really don't know what else to say that can help you.

[glen65]

Re: Spectroniq PLTV-3250 wont start

Thanks for the reply,
I'm not getting DC voltage at the 5, the 16 or the 24 volt outputs.
I'm suspecting that maybe there is still some wrong in the supply, but
I am not sure. I have seen articles on how to start a computer supply manually
without it being installed in the system. It involved jumping two
of the terminals together to start it, and also having some sort of load
connected to it. This supply is very similar so I thought that this one could be rigged in a similar fashioned to start it on the bench without it being installed in the monitor. I was just curious as to which of the terminals I would need to
focus on to get it to switch on. If this can be done it would be a quick way to
isolate which area of the monitor I need to focus on.

[EGuevarae]

Re: Spectroniq PLTV-3250 wont start

if you put AC on the input connector (1st pic, 2nd row) you should have voltage on the output (5th pic, 1st row). As long as the AC is connected (and if a switch exists it is in the on position) that PSU should be "live" (output V present) as it is only a PSU, I can't see an inverter section there.
That is the way I've tested some (the key word here is SOME) PSUs (other ones right in the monitor or device in question). If you replaced bad/suspected components on the PSU, and there are V out then I guess the next move would be the main/Video board.

[glen65]

Hello,
I'm working with a Spectroniq model PLTV-3250 LCD monitor.
It uses an FSP194-3F01 power supply.
The monitor won't start, there appears to be a standby led on
the front but its not lit. In the supply I am getting DC voltage at one of the
leads (about 160V) of all of the heat sinked transistors except
one, so the supply is live, but it wont start. I found some caps
that were swollen at the top, so I replaced them along with some other
smaller ones just for good measure. Also I replaced a shorted surface
mount transistor. Then I went through and checked other transistors and
diodes which all checked good. Just wanted to find out how to rig this
supply so I can run it on the bench. That way I can see if I still have a
supply problem, or something else in the monitor. I've seen different material
on how to manually start a computer supply but this one is a bit different.
I'll post some pics so you can see what I'm working with.

Thanks.