Panasonic SC Board - BAD 30F131 IGBTs

[kc8adu]

Re: Panasonic SC Board - BAD 30F131 IGBTs


[QUOTE=MICROTECHSERVICE;666665 he told me put them in( boiling water !!!)
[/QUOTE]

[Librian1969]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Yes I take your point especially regarding the Chinese components, though I thought the UK ones would have been ok. I will wait for the alternate parts to arrive. I have spent a lot of time reading various posts on here and am wondering whether I should replace the drivers (BD8693) and corresponding transistors (CPH5524). I looked at a schematic and it looks as though I would need to replace 3. The transistors can be bought through rs but I can't find a local supplier for the drivers, only Chinese suppliers. Do you know of a supplier and what's your opinion on replacing them. On a seperate post, a person had the same issue, all ok till he connected sc20 ribbon then bang. Replaced drivers and blown components and all good. I appreciate your feedback

[tw2005]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Why are you persisting with potentially crap parts. Keep it up if you want extra stuff to fix. My TV last about 3 boards in succession with fake parts blowing instantly on the 4th it blew open the P2 track for Vsus to the SC board which resulted in 7 blink once I got the board fixed properly..

I think if sc20 is disconnected it gives 8 blinks,

[Librian1969]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Update, checked the ribbon,sc20 connector. Re-powered and the sc board failed again.

[Librian1969]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Thought I would fit the Chinese components to the sc boards and run some tests, whilst I wait for delivery from Rs components. No short found at sc2. No short found at q102 on the ss board. Fitted sc board and isolated both Su an sd boards. Fitted jumper, connected sc2 and sc20. Powered up, now showing 8 blinks. Checked s2 again. Open cct in one direction 320ohms in the other. Direct short between pin 3 on sc2 and ground and open between pin 1 and ground. Any Ideas?

[tw2005]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Just a further note, when the tv originally failed, I mentioned I heard a loud pop noise before it went into the 7 blink fault mode. I expected that I would see an obvious sign of a failed component, cap etc. Thoughts?

They all go pop not that I get to experience that except when I get shit parts. Unless it is violent enough to blow the head off a transistor you won't see a thing.

[Librian1969]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Just a further note, when the tv originally failed, I mentioned I heard a loud pop noise before it went into the 7 blink fault mode. I expected that I would see an obvious sign of a failed component, cap etc. Thoughts?

[tw2005]

Re: Panasonic SC Board - BAD 30F131 IGBTs

look like this

[tw2005]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Will do, will order them today and see how it goes. What method do you use for fitting to to the board? I have seen a number of recommendations from using solder paste and heat pencil to soldering iron on the tab till solder melts. Either method creates a lot of heat to the component. The legs are the easy part.

If you can get the old ones off, you'll find putting these ones on an absolute piece of piss.

I fully dewick the pads, dab of flux and you're in business as the tab draws so much less heat from the iron it's a breeze.

If you have hot air you can use that to preheat the board a bit but I hand solder the transistors in.

[Librian1969]

Re: Panasonic SC Board - BAD 30F131 IGBTs

I found 25 pcs on a private near my town a few months ago, at 35euros for all of them, and bought them. I used them and all worked fine. Now I am out of stock, and still waiting for the package from china (100 pcs). will see if they are ok. (I am a little worried)

meanwhile, I received 6pcs 30f131 from panasonic service, and repaired a sn board from a P42GW30, and it is working perfect (non stop since yesterday). the funny thing is that they still have these on stock! i can take a some photos with the packaging from panasonic, and the 30f131 piece if you want. the tv is still open.

OK thanks. If you have already reassembled he TV that would be good.

[Librian1969]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Ok, normally the diodes survive.

You could assume the parts may have been bad in which case you could order 10 FGD4536 from RS components and use them for q401,402,403,421,422,423 .

they will do the job and they are smaller but will solder in fine

If they blow then you have other issues or bits missed

Will do, will order them today and see how it goes. What method do you use for fitting to to the board? I have seen a number of recommendations from using solder paste and heat pencil to soldering iron on the tab till solder melts. Either method creates a lot of heat to the component. The legs are the easy part.

[Librian1969]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Could you give the name of the UK seller you got the kit from, there are a lot of fake parts being sold in kits over here.my advice would be dont buy them. iI get boards sent to me for repairs all the time, most after buying IGBTs or kits from eBay,only to see the IGBTs blow on power up

http://www.ebay.com.au/usr/mbtv_elec...53.m2749.l2754

This is the site I purchased the kit. Seemed ok to deal with.

[dj01fad]

Re: Panasonic SC Board - BAD 30F131 IGBTs

I found 25 pcs on a private near my town a few months ago, at 35euros for all of them, and bought them. I used them and all worked fine. Now I am out of stock, and still waiting for the package from china (100 pcs). will see if they are ok. (I am a little worried)

meanwhile, I received 6pcs 30f131 from panasonic service, and repaired a sn board from a P42GW30, and it is working perfect (non stop since yesterday). the funny thing is that they still have these on stock! i can take a some photos with the packaging from panasonic, and the 30f131 piece if you want. the tv is still open.

[Moreno83]

Re: Panasonic SC Board - BAD 30F131 IGBTs

You also got them from china? I just ordered 100 pieces , see if they work or not

[dj01fad]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Ok, normally the diodes survive.

You could assume the parts may have been bad in which case you could order 10 FGD4536 from RS components and use them for q401,402,403,421,422,423 .

they will do the job and they are smaller but will solder in fine

If they blow then you have other issues or bits missed

fgd4536 are working fine on my boards too - instead of 30f131, dg301, rjp30...

[flocko]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Could you give the name of the UK seller you got the kit from, there are a lot of fake parts being sold in kits over here.my advice would be dont buy them. iI get boards sent to me for repairs all the time, most after buying IGBTs or kits from eBay,only to see the IGBTs blow on power up

[tw2005]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Just lifted the legs on q401,402,403,421,422,423 And d401,421. They are all shorted.

Ok, normally the diodes survive.

You could assume the parts may have been bad in which case you could order 10 FGD4536 from RS components and use them for q401,402,403,421,422,423 .

they will do the job and they are smaller but will solder in fine

If they blow then you have other issues or bits missed

[Librian1969]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Just lifted the legs on q401,402,403,421,422,423 And d401,421. They are all shorted.

[Librian1969]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Yes correct, quick rundown. TV made a pop sound then went into 7 blink mode. Tested sc board, direct short at sc2 connector. Sd and Su boards tested ok. Ordered repair kit and replaced q401, 402,403,421,422,423. D401 & 421. Q531 & ic502. No short found at sc2. Refitted board and instantly failed. Showing direct short at sc2 again. And 7 blink mode.

[tw2005]

Re: Panasonic SC Board - BAD 30F131 IGBTs

Hi, I am having issues with a panasonic tnpa5335 sc board and hoping for some advice. I ordered a repair kit from the UK as well as replacement components from China. I fitted the UK kit, and with no short across SC2 I powered it up. Board failed immediately and after investigation found Q401 (30f131) had a direct short. I replaced Q401 and board failed again. SD and SU boards test ok. Any ideas as to where to next?

What worries me is the missing details.

If Q401 is short, 402 and 403 also would have to read short and if any of those shorted then it's pretty much assured Q421,422,423 are also shorted.

Before you even started on this board what was shorted in the beginning?