Protron PLTV-3250, Power Supply has Bulging Caps

[MisterD]

This is a family members TV that I'm working on, The set is dead with no standby light and does not respond when trying to power on.I have checked the Power Supply Board and it has 6 bulging capacitors all Capxon junk, no DC Output voltage on any rail connectors, when TV is plugged in the Main Cap does have 167 VDC across it.

I'm replacing all 12 electrolytic capacitors on this board. I ordered a repair kit and hope to get them by this Saturday. http://www.ebay.com/itm/Repair-Kit-P...item35afd65d19

Here's some pictures of the board, you can see the bulging caps.

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Will post results once I get the parts installed. I did check some other components in circuit with an ohm meter, none appear to be shorted or open, so I will go with replacing the caps first.

[tom66]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

What is the question?

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Oops, I posted in the wrong place, should be in troubleshooting tv's and video sources, so now what do I do? will it be considered double posting if I make a thread there?

[tom66]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

PM a mod such as Ratdude to ask him to move the thread.

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

PM a mod such as Ratdude to ask him to move the thread.

Okay I sent a PM to Ratdude. Thanks Tom

[ratdude747]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

PM a mod such as Ratdude to ask him to move the thread.

Moved.

FYI, if you want potentially faster results, report the thread in the same way you report spam... It's not just for spam and flame wars. Hell, if you need a post edited out of the normal editing time window, you can report that too. Anything where a mod is needed to get the job done.

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Moved.

FYI, if you want potentially faster results, report the thread in the same way you report spam... It's not just for spam and flame wars. Hell, if you need a post edited out of the normal editing time window, you can report that too. Anything where a mod is needed to get the job done.

Thanks ratdude for moving my thread, I looked but couldn't find where to report spam, could you point me in the right direction?

[retiredcaps]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Thanks ratdude for moving my thread, I looked but couldn't find where to report spam, could you point me in the right direction?

Circled in red.

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Circled in red.

Right under my nose. Thanks.

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Okay, I replaced all 12 electrolytic caps which most of them where bulging, TV still dead, still no DC output voltage at all at the power supply white pin connectors, still has 167 VDC across the main cap and that doesn't change when trying to power on the TV.

I have read where several people with this same set and power supply have replaced Q7 transistor and Zener diode ZD4, I measured Q7 in circuit and got 16.5 ohms in both directions of the middle and one of the end pins, should I go ahead and order Q7 and ZD4 ? if so where from and what is the part numbers please if anyone has them. Thanks.

[budm]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Please see these pictures:
http://s807.beta.photobucket.com/use...%20PLTV%203250

http://s807.beta.photobucket.com/use...es/FSP212-3F01

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Is there an equivalent for the 2N2222 transistor? I found a zenith small case NPN 121-Z9065 that I had in a parts drawer listed as NTE 123A which is an equivalent from what I can tell but not 100% sure.
So I called a local radio shack and they don't even have the 15v zener diode, I know a guy at a local TV Shop that has the zener diode but he didn't have the transistor, any sub numbers is appreciated. Thanks.

[tom66]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Well, it is such a ubiquitous part. It is used in a lot of devices so shouldn't be hard to get. I can buy them in bulk "ammo packs" of 5000 at £0.0085 each. 2N3904 would be a low power equivalent.

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

How about a 2N4401 ? I read that it is equivalent. Thanks.

[tom66]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Looks fine to me but are you sure you cannot find 2N2222?

[jetadm123]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Try the MPS2222A located at your nearest RadioShack.

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

I called Radio Shack and they do have the 2N2222 in a prepacked transistor assortment, so I will get that and the zener diode from the TV Shop tomorrow and hopefully have a chance to get them installed by the evening, Thanks for the help, I do appreciate it.

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

More Pictures of Power Supply Board, connectors and pinout of both SMD and Through hole Transistors.

[MisterD]

Re: Protron PLTV-3250, Power Supply has Bulging Caps

Please see these pictures:
http://s807.beta.photobucket.com/use...%20PLTV%203250

http://s807.beta.photobucket.com/use...es/FSP212-3F01

Thanks Bud, the pictures help a lot.