Panasonic TC-50PS14 10 blinks

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

Ok so with the one inverter that's out, what does vcc-gnd on the ic measure?

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

SO you reported 2 shorts on that reg is that still true or are we down to 1 or 0? We've established tab and 2 are the same so on the input you have ? Output you're reporting 30 ohms at this stage.

[Caleb]

Re: Panasonic TC-50PS14 10 blinks

The reg itself appears to be OK at this point, tab and center are the same so only fault appears to be beyond the reg with 30 ohms to ground. Input as I recall was right around 5 k I can verify tonight when I get back home. I don't remember what VCC to ground was on ic773 but will also post when I get home.

[Caleb]

Re: Panasonic TC-50PS14 10 blinks

Ok tested ic773 off board and get 900 ohms between Vcc and ground, and 336k between 2 and 4. Lifted ic464 and ic465 both showed 60 ohms between Vcc and Ground (5 and 3). now have 439k between vout (1) and ground (2) and 257 ohms between ground and vin (3) With all those parts off the board Im getting 384 ohms across d523 now so we are making progress.

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

You should use diode mode to test the diodes in cct. I'm out of those inverter chips so can't check a new one. If 2 are bad, just replace all 3. Not too sure about the 200 odd ohms on the 16V that feeds teh FET driver too, could be bad. maybe someone can check their board and compare?

[Caleb]

Re: Panasonic TC-50PS14 10 blinks

I tested the diode itself and its good (in cct in diode mode as well as one side lifted), with one side of the diode lifted I still get 384 ohm across the pads, I havent had time to try and test out the fet driver, may just end up replacing it if I can ever get to the end of this parts list.

Btw the fet 16604 (B1CHPM000001) is looking like it may be difficult to source is there a compatible replacement?

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

I tested the diode itself and its good (in cct in diode mode as well as one side lifted), with one side of the diode lifted I still get 384 ohm across the pads, I havent had time to try and test out the fet driver, may just end up replacing it if I can ever get to the end of this parts list.

Btw the fet 16604 (B1CHPM000001) is looking like it may be difficult to source is there a compatible replacement?

Yeah, I know. P-channel fet. I don't think I could work out a sub for it. UTSOURCE on EBAY lists them at $2 ea or you'd have to order direct from Sears or someone like that which makes for an expensive repair.

I was looking at a TNPA4410 from the PZ80 and it has one of those on it. I wonder how many useful parts would carry over. There's one for $24 free post in oregon ohio.

You'd have to grab the respective manuals and search the OEM numbers to see what hits you get.

[Caleb]

Re: Panasonic TC-50PS14 10 blinks

I have one of those TPNA4410's, I will have to take a look and see if that part is good, maybe I can salvage some more parts off that board as well, thats where I pulled those 88 diodes from. It gave 7 blinks but I saved it for parts.

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

I have one of those TPNA4410's, I will have to take a look and see if that part is good, maybe I can salvage some more parts off that board as well, thats where I pulled those 88 diodes from. It gave 7 blinks but I saved it for parts.

You may be able to, are the transistors shorted out on the 4410. Ther's probably a few parts on that or even test point we could use for comparison like the FET driver which are the same.

looks like there is only 1 tiny inverter ic on that. I would put some time looking at what is usable, could cut the cost down quite a bit.

Looks like you'll luck out on the IGBTs but I'm seeing other useful stuff if we can prove they're ok and you can get them off cleanly and desolder the leads. It's messy but I've done this in a pinch for some really hard stuff for me to get.


Those 5pin npn/pnp transistors are on that (5) this is good if they are ok, hard to get

[Caleb]

Re: Panasonic TC-50PS14 10 blinks

When I tested it the vscn circuit wasn't working properly, as it was for someone else and the replacement was only 40$ I just swapped it out and upped the bill 40$. I saved it for parts if I got another one in, it looks like that was a good move. I tested that p channel fet and get much better readings on board than on mine. I was too bushed after work to do much on it last night. I saw it has the same fet controller ics as well, at least I can get a point of reference on what my readings should be. I will print a part sheet from that board and see what else I can use (and see which igbts you are referring too). Those inverter ics are only a buck each from utsource

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

they're much cheaper than that and texas instruments make an equivalent. i got mine at UT but a buck each seems the lowest unit price they quote.

It takes 3 weeks to get here I have no idea china - us.

You can copy and paste from the PDF the part details into excel.

I was saying I don't see any iGBTs the same but have not gone right into it. But what they have there may?? e of similar spec?

Q661 RJP6065, RJK6075 on the older model would be close except wrong package. Both would be 600v .

Anyway if you can work out what that board can't donor and get some transistors on the way or list what transistors are on those heatsinks. The 3 pin fast recovery diode blown that older board has a couple of those there so you won't need them.

[Caleb]

Re: Panasonic TC-50PS14 10 blinks

I looked through both boards and it looks like 4401 has all the parts I need except for the 3 fets and 1 igbt. I guess I will go ahead and order those and hope I dont need anything else.

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

I looked through both boards and it looks like 4401 has all the parts I need except for the 3 fets and 1 igbt. I guess I will go ahead and order those and hope I dont need anything else.

I could only see 1 schmitt inverter ic though, how many did you find?

TI equivalent SN74AHC1G14DBVR for TC7SH14F.

The suffix is the size,I think there's a few.

?SN74AHC1G14DBVR

[Caleb]

Re: Panasonic TC-50PS14 10 blinks

according to the schematic there are 5 of the same part number on the sc
ic16773
ic16603
ic16464
ic16465
ic16564

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

according to the schematic there are 5 of the same part number on the sc
ic16773
ic16603
ic16464
ic16465
ic16564

On a TNPA4782, yes. 2 are bad, I'd get extras just in case.


On a TNPA4410 in a 50PZ80, no.

I can only find the 1, IC16564 C0JBAB000715

ic16773, does not exist
ic16603, does not exist
ic16464, does not exist
ic16465, does not exist
ic16564, C0JBAB000715

[Caleb]

Re: Panasonic TC-50PS14 10 blinks

Well that would explain why when I looked at the board I couldnt find any of those numbers. I was using the search function built into the pdf reader you told me about and clicking back and forth from schematic to schematic. I guess the search function was bringing up pages from both schematics. I found them on digikey for a mere 3 cents each....the only bad part you have to buy 3000 of them. I will get a few of those as well. Thanks for your insight on this project.

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

That's why I gave you a TI equivalent, the Toshiba part is probably harder to find.
But they are a little dearer than I thought so a buck each at UT is probably ok.

[aaronwt6]

Re: Panasonic TC-50PS14 10 blinks

Well guys. I got the parts in today and installed. Plugged the set in, hit the power button, and blew them all again in less than a second. At least I got some noise and a nice fireball. Back to the drawing board I guess.

[tw2005]

Re: Panasonic TC-50PS14 10 blinks

Well guys. I got the parts in today and installed. Plugged the set in, hit the power button, and blew them all again in less than a second. At least I got some noise and a nice fireball. Back to the drawing board I guess.

Yes, and also now have probably additional items damaged. It's rare just for the IGBTs to fail.

It's a tough gig to find them all, a little luck is needed too sometimes.

[Caleb]

Re: Panasonic TC-50PS14 10 blinks

Thats a bummer for sure. Havent got mine yet but I kinda have a feeling I will have a similar experience- at least you didnt pay 75$ for the repair kit.