VIORE 32" - Power board problem?

[newtothis]

Re: VIORE 32" - Power board problem?

D prefix is a diode

[philliesfan30m]

Re: VIORE 32" - Power board problem?

is that the only 1 on the board or is d1,2,and 3 the same thing? if they are the same what readings do you get on them? does your multimeter have a diode setting?

[sansonet]

Re: VIORE 32" - Power board problem?

Other two have different numbers written on them. Multimeter have diode/continuity settings and it shows 0 and beeps when first two leads connected off board, all 3 beeps when on board.

[philliesfan30m]

Re: VIORE 32" - Power board problem?

you mean when you checked it not on the board it showed a different reading then when on the board?

[sansonet]

Re: VIORE 32" - Power board problem?

you mean when you checked it not on the board it showed a different reading then when on the board?

Yes, but since leads 1 and 3 are connected on circuit, it expected to be this way.

[philliesfan30m]

Re: VIORE 32" - Power board problem?

can you put it in diode mode and put the black lead on pin 1 and red on 2 then 3 and give readings then put black on pin 2 and red on 1 and then 3 and give readings and then black on 3 and red on 1 then 2 and give readings?

[budm]

Re: VIORE 32" - Power board problem?

OK, since you are getting the PS_ON OK but the 24v power supply did not turn on, you need to find out first if the PFC voltage booter is working or not since the 24v require 380~400VDC to run.
Carefully check the dc voltage RIGHT AT THE TWO LEGS of the big blue cap (with RohS label) to see what the DC voltage is when TV is turn on, it should be about 160~170VDC when TV is OFF and about 380~400DVC when it is on.
The switched 12v is generated by the same transformer that is generating the 5V.
This SCH may be close to what you have on your board.
Never mind, the SCH does not match your board.

[sansonet]

Re: VIORE 32" - Power board problem?

can you put it in diode mode and put the black lead on pin 1 and red on 2 then 3 and give readings then put black on pin 2 and red on 1 and then 3 and give readings and then black on 3 and red on 1 then 2 and give readings?

Black1/red2 - 0
Red2/black1 - 0
Black1/red3 - 235
Black2/red3 - 235
Red1/black3 - no reading
Red2/black3 no reading

[sansonet]

Re: VIORE 32" - Power board problem?

OK, since you are getting the PS_ON OK but the 24v power supply did not turn on, you need to find out first if the PFC voltage booter is working or not since the 24v require 380~400VDC to run.

OK, I'll try this too, I need solder that rectifier back first.

[budm]

Re: VIORE 32" - Power board problem?

OK, this is what you have on your board.

[sansonet]

Re: VIORE 32" - Power board problem?

Carefully check the dc voltage RIGHT AT THE TWO LEGS of the big blue cap (with RohS label) to see what the DC voltage is when TV is turn on, it should be about 160~170VDC when TV is OFF and about 380~400DVC when it is on.

Should I do it with red multimeter probe on positive leg of capacitor and black probe grounded to metal part on TV? I just tried that and it reads about 30-50 when multimeter is set to 200m DCV. It have no readings when set to high voltage.

[budm]

Re: VIORE 32" - Power board problem?

"Carefully check the dc voltage RIGHT AT THE TWO LEGS of the big blue cap"

[sansonet]

Re: VIORE 32" - Power board problem?

Ok, it reads about 366V if I put probes on both legs.

[budm]

Re: VIORE 32" - Power board problem?

OK, the PS_ON is good, the PFC voltage booster is good. Need to trace out the 24V, switched +5v and the switched +12V power supply circuits next.

[sansonet]

Re: VIORE 32" - Power board problem?

OK, the PS_ON is good, the PFC voltage booster is good. Need to trace out the 24V, switched +5v and the switched +12V power supply circuits next.

How can I do it?

[budm]

Re: VIORE 32" - Power board problem?

With lots of times.

[sansonet]

Re: VIORE 32" - Power board problem?

Should I just order board then? I don't think I'll have lot of time for it, and I hardly understand what I'm doing unless it something like testing and replacing bad caps (I'm just a plain housewife....)

[budm]

Re: VIORE 32" - Power board problem?

At this point, yes, it will be really time consuming to troubleshoot down to component level for beginner.

[sansonet]

Re: VIORE 32" - Power board problem?

OK, thank you!

[sansonet]

Re: VIORE 32" - Power board problem?

Just got replacement board - it works now. Still wonder what was wrong with old one, but I guess I'll never know. I just want to thank everyone that helped me here!