TH-P50G15A - 6 Blinks- Bad TNPA4782

[Glitcher]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Any chance we can start referring to D806 as d608, i keep looking for a diode that does not exist

Ahh sorry bout that, Don't know why I keep getting them confused. Must be from a past board I worked on.

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

well game over for my board. just destroyed the Pfet. casing cracked and leg fell out.

bugger

Not sure you're on the right track though as i get the same results with the FET out. I don't think you can get more open cct than what i got with no FET at all now!

[Glitcher]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Dang that sucks wait are you getting the same readings on the pads with the fet removed? As in post 53?

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

FQD4P25 may be ok not that helps me find one any easier

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Dang that sucks wait are you getting the same readings on the pads with the fet removed? As in post 53?

yep little or no difference. you never know but maybe my fet was open ? I actually wanted to test the FET out but that chance is gone

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Actually, i was being sarcastic and now i'm not joking but I think this FET is shot. the whole casing is cracked that's why that leg crumbled out. But this board was working like this except that anomally I discussed with Tom. Which brings me back to these boards working with this part of the cct omitted.

So maybe get a FET, I am LOL.

[Glitcher]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Even with the FET removed I'm still not getting the same readings as you. I'm thinking theres a problem somewhere in the area where D608 is. My D608 reads .707 and OL

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Try opto PC601, they're pretty common on sc,ss boards if you have scraps

[Glitcher]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Just tested PC601 out and changed it, doesn't seem to change my readings for D608 though. I was trying to replaced some extra parts IC464, IC465 near the M81707 FET drivers to be safe but ended up peeling these traces off... Barely even touched it with my iron and it came right off for both of them too! it doesn't seem like the trace goes anywhere, are they just place holders?

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Pin 1 is NC. Well that's pretty rough. Do you have flux pen and a very fine conical tip?

We seem to be heading off in tangents now. I'm still curious about the OL across the diode

[Glitcher]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

What exactly is NC?

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

I took my opto out still same unless this is just how your meter rolls? What do you have?

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

What exactly is NC?

No Connection

[Glitcher]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

So I guess I'm fine without those traces? Explains why it would peel off so easily I guess.

I just have a regular meter I bought from some electronics store.

Maybe it was the diode you used?

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

So I guess I'm fine without those traces?

I just have a regular meter I bought from some electronics store.

Maybe it was the diode you used?

I had the same reading both direction until I replaced it, remember. W'e already compared that's what lead me to replacing my diode

[Glitcher]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

answered in post #40 but now with this huge 1watt zener 0.663 & 1.7.

Its that 1.7 that's different from mine. I'm getting 0.704 & OL.

[Glitcher]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

blk lead on D, I get is 9.36k G-S, ol on any other
red lead on D, 2.26Meg D-G, 2.31Meg D-S

blk lead on D I have 9.75k G-S, ol on any other
red lead on D 7.35Meg D-g, 7.34Meg D-S

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Its that 1.7 that's different from mine. I'm getting 0.704 & OL.

yep, I realise but we may be chasing a non issue if your meter reacts different.

I get about 9.5k in either direction and there's a 10k rsistor across where we are testing> I don't think we can get clear picture of what's going on and I can't see where to go next or if i's worth the time

[tw2005]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

blk lead on D I have 9.75k G-S, ol on any other
red lead on D 7.35Meg D-g, 7.34Meg D-S

Is d619 ok?

[Glitcher]

Re: TH-P50G15A - 6 Blinks- Bad TNPA4782

Well going through all the IGBTs again I just found Q660 is short... I didn't replace this one yet since it wasn't shorted the first few times I went over it.