blown chip ?

[DrE]

hello !

we just finished (almost) the amp 10.

everything was fine, we had around 4,6 volts at j10, no blown fuse. unfortunately we soldered one of the capacitors instead into pin 4 and 8 to false 4 and 6.
when we powered up the system sparks and smoke came up - at the chip ...

we corrected the false capacitor to 4 and 8 . now the led is not working anymore and the chip is going to get hot ...

any suggestions ?

thanks,

michael

[DrE]

Hi !

No one with an idea - is the chip blown ? We cant see anything wrong on it - but it smells funny, is it possible to
measure something ?

Should i post some pictures ?


Any help appreciated,



Michael

[Jogi]

Hi Michael,

I'm sorry, but from my own experience I would say, that the chip has gone to nirvana. Smoke and bad smell is surely the last fart [xx(]so to say.
So order another chip, and give it a second try...
These chips are quite sensitive to overvoltage and other mistakes, unlike valve amps.

ciao,

juergen

[DrE]

Thanks Juergen !

I will order another chip - any suggestions for more measuring points before i do another test ?


Michael

[Scratchy]

Have a look at your chip to see if you have one of these:



***It's so easy, everyone should be doing it***

[DrE]

Hi Scratchy ...

No, i do have a TA 2022 ...

Michael

[Scratchy]

Yes, but I was referring to the crater in the chip....
Sometimes these chips can go with catastrophic results...

***It's so easy, everyone should be doing it***

[DrE]

Ui - i finally found something on the chip, its fryed ....

I will order another one and give it another try ....

Maybe we will have more luck now ....


Thanks again,

cul8ter


Michael

[Scratchy]

This chip failed due to bad(incomplete) soldering.
Have a look at this thread for detailed pics.
http://41hz.com/Forums/topic.asp?TOPIC_ID=2255

Some of the legs had solder blobs stuck to them, but not to the board.
When I cut the chip legs to remove it, one of the legs just fell out of the hole.
Pictures can tell a thousand words.
Please post some closeups of your soldering before you do anything.

Thanks

***It's so easy, everyone should be doing it***