Need to purchase this diode to repair my Panasonic Plasma TV PSU. T2D76 is written on its body and it has a red band on one side. Tried to Google/Digi-key...etc but to no avail. Can anyone help?

 

It's probably a Fast Recovery Diode like the BY500 /800 series..


https://www.rapidonline.com/Diotec-...MI_eC_w5HH5AIVgbTtCh0IFQiJEAQYAiABEgL_EvD_BwE

 

Thanks for your assistance! I'll check on it.

 

It's probably a Fast Recovery Diode like the BY500 /800 series..


https://www.rapidonline.com/Diotec-...MI_eC_w5HH5AIVgbTtCh0IFQiJEAQYAiABEgL_EvD_BwE

That IC doesn't look so good either.

kv

 

That IC doesn't look so good either.

kv

That is probably a flyback SMPS controller. Those DIP-8 packages with one leg missing are quite typical for those. It seems good to me.

Kind regards, Samuel Lourenço

 

That IC doesn't look so good either.

kv

It's a MIP3E3 chip, pin 6 is cut off, only 3pins connected.

 

It's a MIP3E3 chip, pin 6 is cut off, only 3pins connected.

View attachment 185993

I think you meant pin 7 is cut, I was referring to the toasted terminal 8, it looked in line with the suspected diode, seems like I could see some scorched marks on the board leading to the negative on the electrolytic cap also. Something I wouldn't overlook and just replace or at least check.

kv

 

It does look a bit like the joint overheated and the solder balled up (whats the term for that?).
Its PIN 5 tho not pin 8. Pin 6 is the one cut off.


Edit: Just noticed its already labeled on silkscreen.

 

It does look a bit like the joint overheated and the solder balled up (whats the term for that?).
Its PIN 5 tho not pin 8. Pin 6 is the one cut off.
View attachment 186016

Edit: Just noticed its already labeled on silkscreen.

You looking for cold solder joint, I would call it the black blob

kv

 

It doesn't look like solder, but some kind of sealant, IMHO. Normally, then these chips go bad, the "lid" pops off. They literally split in two with a bang.

Kind regards, Samuel Lourenço

 

It doesn't look like solder, but some kind of sealant, IMHO. Normally, then these chips go bad, the "lid" pops off. They literally split in two with a bang.

Kind regards, Samuel Lourenço

Didn't say it was bad, I just said looks like it took some heat. If he's able to get it up and going then cleans things up, re-soldering all surrounding heated components. If I was in this far, why not change them out? the labor going back in costs more than the components.

Not my first rodeo, worked in a TV repair shop for 15 years, as well as diagnose and repair proprietary electronics. I've seen my far share of burn outs.

kv

Edit: Oh, and @narkeleptk sorry I miss read the chip, been 20 years since I've dealt with these chips. You were right.

 

With the help of @narkeleptk I found this part at several stores from AliExpress. I have ordered T2D from AliExpress already since I can't find this part in my country. Need to wait 2 - 3 weeks. I'll update you guys once I replaced the suspected parts.

 

I think you meant pin 7 is cut, I was referring to the toasted terminal 8, it looked in line with the suspected diode, seems like I could see some scorched marks on the board leading to the negative on the electrolytic cap also. Something I wouldn't overlook and just replace or at least check.

kv

I'm right see post #8

 

Have taken closer pictures of the IC and the back of the pcb. These might help.

 

I'm right see post #8

Good Grief, Dave. How long did it take for you to make it back here, you must be all over the forum. I already said I didn't have the correct pin, Post #11 @narkeleptk corrected me.

It's early time for Breakfast.

kv

 

Have taken closer pictures of the IC and the back of the pcb. These might help.

Have you done any rework? Looks better to me now. Still some of them look like they got pretty hot.

kv

 

I think that what you are calling scorch marks are just dirt. It looks like this TV comes from a house of smokers. The electrostatic forces near high voltage points will attract dirt and smoke and deposit them on the board. Also, the IC has two eyelets inserted in the board - those are the two circles under the IC. Eyelets allow the solder to wick up the leg more easily, thus you sometimes see the solder balls.

 

I think that what you are calling scorch marks are just dirt. It looks like this TV comes from a house of smokers. The electrostatic forces near high voltage points will attract dirt and smoke and deposit them on the board. Also, the IC has two eyelets inserted in the board - those are the two circles under the IC. Eyelets allow the solder to wick up the leg more easily, thus you sometimes see the solder balls.

I see the wicking now that we have better pics. Seen the eyelets.

Man takes me back a bit, in the shop the old sets would get the dust and the smoke accumulation on the wires everything was covered, CRT's with the high voltage, it was the most disgusting thing to see, I would just put the back on and call the customer to pic up the TV, not worth it.

Yuck.

kv

Edit: Actually if this is a heat problem, I can see why you would want eyelets to reinforce that section of the circuit because of the heat.

 

Have you done any rework? Looks better to me now. Still some of them look like they got pretty hot.

kv

So far, I’ve just taken out D411 and C492 to check out-of-ckt. I don’t have the replacement yet.

 

After all, it is not sealant, as I though. It is a strange blog of solder (like the hole is bigger and plated, which is strange for a single sided PCB), but it doesn't look like it is the result of any overheating. The blackened pins seem to be dirty and/or corroded. It is just mild corrosion due to aging, nothing serious.

Kind regards, Samuel Lourenço