PANASONIC SC board TNPA5082 - 3pcs - IGBT replacement ?

[olegeisler]

Hi All

Fixing no less than 3 SC boards from TXP42G20E plasmas.

Managed to get original parts, and two boards are now done, and working ( Also got fake DG402S from Ebay , since they were out of stock at the time of order - but I checked them before mounting, so no harm )

I made a mistake during ordering, so I am short of a 45G128 IGBT (pos Q452 ) for the last SC board
I have the IGBTs in excess:

30F125
45F128
2PG006
DG502
RJP63F4A

Any of these I can use as replacements ? ( 45F128 is lower voltage, so I will say "no" myself - but if someone knows better, then.... )

I could just order a 45G128, but it is a hassle, and I am fixing these for absolutely non-profit, owners only pay the parts - and a beer....

Info for others, what I saw and did to fix :

Q621, Q622 (30F125) - not shorted, but replaced them anyway
Q421, 422 (DG402/2PG006) - shorted, replaced
Q402, Q403 (DG502) - shorted, replaced
Q452 (45G128 ) - shorted, replaced
Q661 (RJP63F4A) - shorted, replaced
IC501,IC521 (M81737FP) - not shorted, seemed fine, but replaced anyway

Tested low voltage circuitry by applying 16V to the 16VF line, and checking for 5V outputs on IC724/IC771

[tw2005]

Re: PANASONIC SC board TNPA5082 - 3pcs - IGBT replacement ?

Hi All

Fixing no less than 3 SC boards from TXP42G20E plasmas.

Managed to get original parts, and two boards are now done, and working ( Also got fake DG402S from Ebay , since they were out of stock at the time of order - but I checked them before mounting, so no harm )

I made a mistake during ordering, so I am short of a 45G128 IGBT (pos Q452 ) for the last SC board
I have the IGBTs in excess:

30F125
45F128
2PG006
DG502
RJP63F4A

Any of these I can use as replacements ? ( 45F128 is lower voltage, so I will say "no" myself - but if someone knows better, then.... )

I could just order a 45G128, but it is a hassle, and I am fixing these for absolutely non-profit, owners only pay the parts - and a beer....

Info for others, what I saw and did to fix :

Q621, Q622 (30F125) - not shorted, but replaced them anyway
Q421, 422 (DG402/2PG006) - shorted, replaced
Q402, Q403 (DG502) - shorted, replaced
Q452 (45G128 ) - shorted, replaced
Q661 (RJP63F4A) - shorted, replaced
IC501,IC521 (M81737FP) - not shorted, seemed fine, but replaced anyway

Tested low voltage circuitry by applying 16V to the 16VF line, and checking for 5V outputs on IC724/IC771

How complete is your List? looks deficient of some popular bits.

So you've done 3 and none had blown schmitt inverter IC TC7SH14FU

IC521 is the main oe that goes, never had 501 go yet.

Replacing the 30F125 is a good idea because they can fail not shorted say around 300ohms. Catches plenty of people out because it won't show as a dead short beep.

If you want to experiment try 2PG006, DG502,RJP63F4A.

It's unlikely it needs to be 400v, I have used a 300V diod there in deperation without fire. So 45F128 could also do , never tried

I've also used RJP43F4A for the 402, RJP56F4A for the 502, Also used a RJP56F4A for th e 63F3A. Actually came across a different version for a larger TV which used that there for Q661.

[olegeisler]

Re: PANASONIC SC board TNPA5081 - 3pcs - IGBT replacement ?

How complete is your List? looks deficient of some popular bits.

So you've done 3 and none had blown schmitt inverter IC TC7SH14FU

IC521 is the main oe that goes, never had 501 go yet.

Replacing the 30F125 is a good idea because they can fail not shorted say around 300ohms. Catches plenty of people out because it won't show as a dead short beep.

If you want to experiment try 2PG006, DG502,RJP63F4A.

It's unlikely it needs to be 400v, I have used a 300V diod there in deperation without fire. So 45F128 could also do , never tried

I've also used RJP43F4A for the 402, RJP56F4A for the 502, Also used a RJP56F4A for th e 63F3A. Actually came across a different version for a larger TV which used that there for Q661.

OK, RJP63 it is

My list is complete, that is what I did to these two boards.
Checked the inverter too, when I had low voltage on boards, it was fine.

Thanks. Lets see if I can be succesful for the 3rd time

I will probably never do this again, its just for the fun....

[tw2005]

Re: PANASONIC SC board TNPA5082 - 3pcs - IGBT replacement ?

OK, RJP63 it is

My list is complete, that is what I did to these two boards.
Checked the inverter too, when I had low voltage on boards, it was fine.

Thanks. Lets see if I can be succesful for the 3rd time

I will probably never do this again, its just for the fun....

yeah it's funny. I've only done 50" so maybe the 42 fails slightly different. I have struck some 5105 boards that had ok inverters. and I did a 54" and it cleaned me up for IGBTs, over 20 bits replaced.

[tw2005]

Re: PANASONIC SC board TNPA5082 - 3pcs - IGBT replacement ?

Oh and the SC is 5081 not 5082 in the title

[olegeisler]

Re: PANASONIC SC board TNPA5082 - 3pcs - IGBT replacement ?

yeah it's funny. I've only done 50" so maybe the 42 fails slightly different. I have struck some 5105 boards that had ok inverters. and I did a 54" and it cleaned me up for IGBTs, over 20 bits replaced.

You triggered me to check around drivers, and this board had more issues !
THANKS a lot !

Also changed

D482
D451
R452
Q551

And used the RJP63 for 45G128 - seems to be fine.

Set works

Only part that becomes "hot" is the heatsink with Q660/Q661, it runs above what I can hold on to...

[ReeceyBurger123]

Re: PANASONIC SC board TNPA5082 - 3pcs - IGBT replacement ?

Q661 is where the issue starts, because it runs so hot it wears out the fet and over time it fails presumably at startup and blows everything else up. Good job getting it going

[olegeisler]

Re: PANASONIC SC board TNPA5082 - 3pcs - IGBT replacement ?

Q661 is where the issue starts, because it runs so hot it wears out the fet and over time it fails presumably at startup and blows everything else up. Good job getting it going

I believe it. I was in the repair busness 15 years ago, now I changed to the dark side, and does actual electronics design instead - or rather, I have a group of clever colleagues who does. I am just the guy guy with the spreadsheets and PPTs nowadays - thats also why this is fun - real hands-on electronics

Semiconductors running hot is an absolute no-go in our designs - and I did show our best analogue / power designer the schematics of the SC board, and he got "tics" - just from a quick look, he was impressed that it worked at all...
But - it is consumer electronics, so....

[tw2005]

Re: PANASONIC SC board TNPA5082 - 3pcs - IGBT replacement ?

You triggered me to check around drivers, and this board had more issues !
THANKS a lot !

Also changed

D482
D451
R452
Q551

And used the RJP63 for 45G128 - seems to be fine.

Set works

Only part that becomes "hot" is the heatsink with Q660/Q661, it runs above what I can hold on to...

sounds normal, it gets bloody hot as well as the BGA on the mainboard

[ReeceyBurger123]

Re: PANASONIC SC board TNPA5082 - 3pcs - IGBT replacement ?

I believe it. I was in the repair busness 15 years ago, now I changed to the dark side, and does actual electronics design instead - or rather, I have a group of clever colleagues who does. I am just the guy guy with the spreadsheets and PPTs nowadays - thats also why this is fun - real hands-on electronics

Semiconductors running hot is an absolute no-go in our designs - and I did show our best analogue / power designer the schematics of the SC board, and he got "tics" - just from a quick look, he was impressed that it worked at all...
But - it is consumer electronics, so....

Thats it, cut down design for Q661 area is what causes it. The heatsink should be bigger and they should of put a higher current or even two of them fets in place. However Im unsure if the controller Ic for them could be possibly the start as they run very hot too-IC521