Yay a TNPA5105 Blown up Video Of Repair :D

[vinceroger69]

Re: Yay a TNPA5105 Blown up Video Of Repair

anyway of limiting parts blowing if you have over looked one maybe using a bulb on one of the voltage lines (im sure ive read a post where alastair did this)

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

No not cheap you must have seen my listings for IGBTs are £5-6 and drivers £7.50 each so not hard to see were your money went. I think my listings are about ballpark for these parts over here (UK). I just list the left over parts I used in my older Panasonic repairs.(tried + tested) But when there gone I will not be replacing.If you can wait and can trust the sellers China is always the best option cost wise.

I think I brought some off you bud, my initials are RE ?

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

anyway of limiting parts blowing if you have over looked one maybe using a bulb on one of the voltage lines (im sure ive read a post where alastair did this)

Yeah I could use something like a lightbulb to cause a voltage drop but its alot of faff or could use a bench supply and apply vs but lower and bring it up. Automotive section in college would let me use one so should be ok.

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Trannys are all here, just waiting for the tranopto Ic from the states

[Alastair E]

Re: Yay a TNPA5105 Blown up Video Of Repair

Shoulda given me a shout for that Transoptor--I got around 10 of 'em--Since I got them, Ive not seen many of this type SC board to do....

Used in this and the similar 5081

--Dont forget to check/change the 5V reg,--The smaller of the two near the transoptor, it supplies the inverter 703 and the smd trannies Q701/2, Q808 etc which are involved with the dreaded Q661....

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Hmm will do cheers Ali hey fancy posting me some save me some time ehy will sort you some favors back (Lg Psu) Also oddly Q661 is not short so I dont think its reg is damaged.

[Alastair E]

Re: Yay a TNPA5105 Blown up Video Of Repair

661 Not Short....

Weird!

Aye, go on then, send us your add....

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Nice one will do matey, also yep its fine but Im changing it anyway.

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Right all the parts come, however first test failed. Q661 RJP43 blew again as well as Q621 RJP3034 and the two diodes in series with Q421 D641 & D642 RF2001 Ahh time to keep checking but everything was fine with my meter so something else must have gone up.

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Now the fucking SS is short wtf, buffer still fine ? Also Q451 and R451 blown out again.

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

This is fucking shit, at least £30 worth of damage done again. Might scrap it time to let go of some things I think.

[flocko]

Re: Yay a TNPA5105 Blown up Video Of Repair

Sorry Reecey I did try and warn you about getting on the Panasonic SC ride of pain, when you get on it,it can be hard to get off as you have found to your cost.But dont give up its only money anyway

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Yeah I guess might just say to customer I cant fix it and part exchange it with one Im selling its just too much for her to pay.

[flocko]

Re: Yay a TNPA5105 Blown up Video Of Repair

You will know from what I have said before,if your repair is not a first time fix you will blow more and more parts with every fail. So the first fix parts roadmap will be added to, and then you are down to checking almost all the components on the Sc/Ss and in some cases the power board as well.This is why repairing the board is not always the best way forward, getting a S/H board when you can find one from a good source can be a good option as long as you check it out before fitting, if it fails your testing you just return it with no money loss.do as you say with P/X you will at least have a happy customer who will come back,and recommend you to others. Flocko

[syaoran123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Its always good to try component repair first. And when you do, you'd make some modifications to ensure longevity, like replacing bad caps with higher rated caps. It doesnt feel safe replacing board for board, knowing its gonna blow again cos its a common problem.

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Seems that these chain the ERC which is a pain, I over looked it. Will update on what parts of X drive blew out could of been damaged beforehand which is what blew my repaired Ydrive. Some of the the transistors on the Xdrive were short but there was no short on Vs so this could of been why I missed them. Ahh why so expensive

[flocko]

Re: Yay a TNPA5105 Blown up Video Of Repair

The thing to watch for on the TNPA5106 SS,is the replacement SMD IGBTs that you use lots of fakes about as you know= BANG and back to the start you go, I wish I could be of more help,but when you climb on the Panasonic ride of pain it can be a rough ride. the one rule of dismounting is test, test and test again before power up

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Yeah, the failure point of these is because of poor heatsinking/cooling is my guess. Shame this happenes with pannys as they look good when they work. My guess is the 30f toshishita fets fail first which kills the rest.

[flocko]

Re: Yay a TNPA5105 Blown up Video Of Repair

I not sure about your heat theory,as some Panasonic boards that have SMD IGBTs that use heat sinks still fail the same as the ones that dont. the problem as I see it is the use of groups or pairs of components to get a higher rating, then one fails to switch as fast as the others leading to a cascade of parts failing, this is why you must alway replace any blown IGBTs / diodes that are grouped as a complete set with drivers and transistor arrays. There are no short cuts to a good repair, and as you have found to your cost you will not get a second chance without pain

[ReeceyBurger123]

Re: Yay a TNPA5105 Blown up Video Of Repair

Unsure heat does wear them out faster though causing a possible delay in avalanche switching meaning one doesn’t switch fast enough as you say and dies. Odd though as transistors can last a very long time such a pain to fix.