Sub part for F50ALW D401 FOR PLASMA TNPA5081

[Tech 57]

i am rebuilding this Panasonic plasma sc board D401 & D402 are F50ALW cannot find these.
D401 & D402 are these critical transistor type diodes or can i use any on a scrap board that has the Diode transistor case
Thanks

[Alastair E]

Re: Sub part for F50ALW D401 FOR PLASMA TNPA5081

You'll need a Ultra-Fast Soft-Recovery diode for them...

Summit like the IXYS DSEP29-06B, Soft Recovery Diode, 600V 30A, 30ns, 2-Pin TO-220AC

But--STRONGLY recommend you get the correct type--Seeing the HUGE DEVASTATION that occurs when these boards blow up.

Check Q661 (Guarantee Short) Plus Q701, Q702, IC773, IC771 Possibly the Transoptor, PC461 etc....

Any Heatsink Mounted IGBT, You'll need to Check--IF ANY found short, or even Slight Leak--You'll need to replace them plus their Gate Resistors Plus the Dual Transistor pairs and possibly IC501 and IC521 Definitely.

Check out the TNPA5081 Rebuild thread....

With these boards There's NO second chances--They blow Instantly unless you get 'em right First Time--With Even More devastation!

[Tech 57]

Re: Sub part for F50ALW D401 FOR PLASMA TNPA5081

Thanks
I found a junk board that had the part that i needed

[tw2005]

Re: Sub part for F50ALW D401 FOR PLASMA TNPA5081

Thanks
I found a junk board that had the part that i needed

So they were shorted even after removing the bad IGBTs? I've been lucky not to have struck a bad one yet.

[tw2005]

Re: Sub part for F50ALW D401 FOR PLASMA TNPA5081

Some data, 510V, Fast Rectifier, 20Amp

[Alastair E]

Re: Sub part for F50ALW D401 FOR PLASMA TNPA5081

On every board--not only 5081 Ive not had any bad D401/2 either....

I wonder whether the o/p checked them after removing the short IGBT's that are wired parallel to 'em....