Q about The Olde TDA3576B

[Andy]

I wrote in an earlier post (Philips oldtimer...) about a 20 year old TV-set
that I'm trying to repair, just
for fun. I now suspect that the multi-purpose circuit TDA3576B has died
since many of its outputs are dead. The only non-DC signal it outputs is a
sawtooth on pin 16.

Now my question: Is it likely that it has died? I'm asking since a new
circuit is rather expensive (approx $50 here) and I do not want to spend too
much time and effort on finding a used one if the original isn't bad.

Thanks a bunch!

Andy

 

[Franc Zabkar]

I wrote in an earlier post (Philips oldtimer...) about a 20 year old TV-set
that I'm trying to repair, just
for fun. I now suspect that the multi-purpose circuit TDA3576B has died
since many of its outputs are dead. The only non-DC signal it outputs is a
sawtooth on pin 16.

Now my question: Is it likely that it has died? I'm asking since a new
circuit is rather expensive (approx $50 here) and I do not want to spend too
much time and effort on finding a used one if the original isn't bad.

Thanks a bunch!

Andy

FYI, the TDA3576B is only AU$20 over here.

Have you seen this fault database for the K40 chassis?
http://www.eserviceinfo.com/repair_tips_database/Philips_090.html

A circuit diagram is available here:
http://www.eserviceinfo.com/downloadsm/2599/Philips_K40.html


- Franc Zabkar

 

[Andy]

FYI, the TDA3576B is only AU$20 over here.

Have you seen this fault database for the K40 chassis?
http://www.eserviceinfo.com/repair_tips_database/Philips_090.html

A circuit diagram is available here:
http://www.eserviceinfo.com/downloadsm/2599/Philips_K40.html


- Franc Zabkar

Thank you very much for the links! It seems that the 3576 has been the cause
in earlier cases. I'm still surprised that a tiny IC can go bad. In my
experience only devices that run very hot or that draw a lot of current
(like the HOT) go bad.

I will see if I can find that little buggar in another TV-set.

Andy

 

[NSM]

Thank you very much for the links! It seems that the 3576 has been the cause
in earlier cases. I'm still surprised that a tiny IC can go bad. In my
experience only devices that run very hot or that draw a lot of current
(like the HOT) go bad.

ISTR that some MOS processes were notorious for developing rot over time. I
recall a text to speech chip which commonly failed.

 

[Andy]

ISTR that some MOS processes were notorious for developing rot over time.
I
recall a text to speech chip which commonly failed.

Interesting. Maybe this chip is one of those affected. It is not *that* bad
though since it is almost 20 years old...

Andy

 

[Andy]

I wrote in an earlier post (Philips oldtimer...) about a 20 year old TV-set
that I'm trying to repair, just
for fun. I now suspect that the multi-purpose circuit TDA3576B has died
since many of its outputs are dead. The only non-DC signal it outputs is a
sawtooth on pin 16.

Now my question: Is it likely that it has died? I'm asking since a new
circuit is rather expensive (approx $50 here) and I do not want to spend
too
much time and effort on finding a used one if the original isn't bad.

Thanks a bunch!

Andy

Hey everyone, and thanks for your replies.
It *was* the TDA3576B that had gone bad. I bought one new, replaced and the
TV-set came back to life!
I wonder how many years it will last now...

Andy