Finlux 32FLD760P with Vestel 17PW20.v1

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

I still wouldn't know what I should be looking for, but I'm going to try and heat it up.

Same problem with the 17PW15-9, most if not all the vestel PSU's are from GB. I really wonder why there's none at all in Sweden, is it such a rare tv or what?

[tom66]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Most big TV manufacturers decided instead of making their own TV they'd rather re-badge. So a lot of Toshiba, Sharp etc. LCD TVs used these chassis, and are now dying.

OK, I will have another look in the morning and consider a few possibilities.

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Thanks Tom, I really appreciate all the time you're taking to help me out.

I'm hoping to repair this tv mostly because I really want to learn how things work, and right now I'm unemployed so I have all the time in the world which frankly, is really boring.

I'll see what I can find out with the heating problem. Remember in the beginning with the old 15nF caps I said I glued them to the heatsinks of the fets as in the picture?

Back then I thought that cooled them, but those get warm, and during that time the tv worked good. But now it works better when it's cool. I'm so confused haha.

See you in the morning!

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Heating the caps in the red circle causes the tv to start flickering and the sound to crackle more!

I know it's located around there because, well, I heated the caps with a warm lightbulb. Yes, it's not professional, but hey I'm unconventional!

Atleast now I think the faulty are is located? I'm guessing those caps are bad, but not bulging.

Edit. Forgot to mention that the second I removed the lightbulb the tv went back to normal, some small crackling noise but no flickering.

2nd Edit. When that area is heated the tv flickers, but when I put a tablefan to blow on the tv it works fine again. Definitely something with the heat going on. I'll keep on testing, carefully. I won't blow anything up, promise.

[vinceroger69]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

does sound like a capacitor issue to me this is where a esr meter may help but for the cost of the caps you have circled i would replace them also under the black lip covering the capacitors are there any more capacitors under there we cant see? i would also resolder that area under the caps you are heating up just to rule out a bad solder joint the eye may not see the heat maybe expanding a bad joint and when it cold contracting? hence why it works then but i still think it may be a capacitor issue.

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

So earlier I managed to snatch my girlfriends hairdrier and start testing to heat the board. I get a heavy flickering reaction when heating inside the big red circle. Since the hot air does get around alot, I'm not sure exactly which part, but when I hold it over that yellow big... thing, I does flicker the most and almost instantly when heat comes.

However, as I said, it's not a focused beam of heat coming there, might as well be the original place I found but anything that can help you help me right?

Vinceroger69: Yes, there's 2 small caps and one hourglass shaped on under the lip which is not seen in the picture, none has bulging or visible faults, but one can never know.

[vinceroger69]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

this site has a lot of parts for vestel
http://sparedparts.com/parts/manufac...ory/vestel/P29

[tom66]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

The two caps near the right bottom screw can sometimes fail and cause loss of PFC on this set..

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Bah, using a hairdries probably isn't accurate enough. This time I heated first in the bottom right corner and nothing happened, then I heated evenly on the board and nothing happened, and at the end I focused on the bottom left, at the other caps and connectors there and boom, almost straight to white.

Not sure if it's the caps, or the fact that the heatsinks gets warm? Faulty fets? I've seen some included in some of the repair kits available so I'm guessing they're not the best?

[vinceroger69]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

can you use a piece of carboard to aim the heat direct down the tube i have used in the past a kitchen roll cardboard tube aimed the hair dryer heat down the tube.

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

That's exactly what I've been thinking about! I haven't done it yet only because I figured the heat would spread at the end when it hits the board anyway, but I can always try.

Right now I have the psu on my table, going to resolder some points in hope of cold joint problem.

Tom! The two caps at bottom right are both 100uF 63v and 33uF 63v, they look fine but I don't trust that. However, I only have 100uF 50v and 33uF 50v caps at home, would that work or is it too big risk it'll blow?

Edit. And an old computer PSU which I've scavenged parts from before, going to have a look in there if there's anything left I can use.

[tom66]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Both of those caps will work fine. Voltage on the capacitor is a rating, not actually what the capacitor has across it, working voltage should be the same or higher as original. Make sure they are from a good manufacturer if you want it to last.

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Panasonic ones I'll try and replace them then, couldn't find a single 63v cap on the other PSU. Something makes me think they made these boards with UK and your 240v in mind, I guess it needs more room to play over there.

But I'm no professional, just speculating

[tom66]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

They are rated 180~265V and I got one to work down to 150V. When PFC works they can work over a wide range but when it doesn't they struggle. Merely moving it from one part of Leeds to another was enough to get one TV to work: here, I have 245VAC most of the time, but I measure 230VAC elsewhere.

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Changing those 63v caps to 50v didn't work, now it doesn't show any signs of life at all, not even the electronic beeping noise that usualy comes on as soon as I plug it into the wall.

I checked to make sure there's no solder where it shouldn't be but it looks fine.

This confuses me, haha.

Edit. By the way, the caps I soldered on were brand new, so I don't think that's the problem.

Edit 2. I'll put the old caps back and see what happens. Wish me luck!

[tom66]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Oh! You said they were 35V originally? Now they are 63V? There isn't anywhere near 63V on this board though (at least for PFC control...) so it probably won't matter.

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

No no, the original caps from factory were 63v ones, and I had 50v only but same uF.

There's no signal of life at all in it now that I changed them

[tom66]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Put the originals back then. No standby LED?

[Serkai]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

Nothing at all, no standby LED, no humming or buzzing from the PSU, nothing. Completely silent!

[tom66]

Re: Finlux 32FLD760P with Vestel 17PW20.v1

What do the PSU outputs measure. Check power button is pressed in. All connectors installed including that little two pin fake standby button.