Q about The Olde TDA3576B
 

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

On Thu, 27 Jan 2005 11:02:56 +0100, "Andy" put
finger to keyboard and composed:

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_t...ilips_090.html

A circuit diagram is available he
http://www.eserviceinfo.com/download...ilips_K40.html


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

"Franc Zabkar" skrev i meddelandet
...
On Thu, 27 Jan 2005 11:02:56 +0100, "Andy" put
finger to keyboard and composed:

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_t...ilips_090.html

A circuit diagram is available he
http://www.eserviceinfo.com/download...ilips_K40.html


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

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

"Andy" wrote in message
...

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.
--
N

"NSM" skrev i meddelandet
news:pVvKd.67067$Qb.1737@edtnps89...

"Andy" wrote in message
...

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.
--
N

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

Andy

"Andy" skrev i meddelandet
...
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