Problems with a TDA3565 PAL decoder

[J.Oppermann]

Perhaps anybody has some experience with the "older" TDA3565.
I have the datasheet, but that's a bit too brief for me as I happen to have not
too much experience with TV-Electronics.

In the "S-Video to RGB Converter" where the IC is used the TDA3565 gives no RGB
output anymore. Only about 1.5V DC on Red. It gets quickly quite hot (about
50-60°C I'd estimate) even though the datasheet says sth about 1W power
consumption, it makes me considering a damaged IC...

The adjustment voltage on pin 6 (contrast - actually 1-4V) is pulled down to
about 0.5V. I was wondering if this might indicate a damage of the IC, or a
feature that might be some kind of output protection.

Before the RGB output "vanished" I got a very dark picture (voltage on pin 6 was
already "pulled down").

Funny enough, as I disconnected the poti from pin 6 to check if it was providing
the correct voltages (i.e. 1-4V) - which it does. Suddenly the input on pin 5
(saturation) pulled the voltage down to 0.5V instead.

maybe somebody can give me some advice?
TIA Jo'

 

[Jerry G.]

Change the IC to check it!

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"J.Oppermann" <me@privacy.net> wrote in message
news:c6ocqb$dn7af$1@ID-67386.news.uni-berlin.de...
Perhaps anybody has some experience with the "older" TDA3565.
I have the datasheet, but that's a bit too brief for me as I happen to have
not
too much experience with TV-Electronics.

In the "S-Video to RGB Converter" where the IC is used the TDA3565 gives no
RGB
output anymore. Only about 1.5V DC on Red. It gets quickly quite hot (about
50-60°C I'd estimate) even though the datasheet says sth about 1W power
consumption, it makes me considering a damaged IC...

The adjustment voltage on pin 6 (contrast - actually 1-4V) is pulled down to
about 0.5V. I was wondering if this might indicate a damage of the IC, or a
feature that might be some kind of output protection.

Before the RGB output "vanished" I got a very dark picture (voltage on pin 6
was
already "pulled down").

Funny enough, as I disconnected the poti from pin 6 to check if it was
providing
the correct voltages (i.e. 1-4V) - which it does. Suddenly the input on pin
5
(saturation) pulled the voltage down to 0.5V instead.

maybe somebody can give me some advice?
TIA Jo'

 

[Andre]

"Jerry G." <jerryg50@hotmail.com> wrote in message news:<c6og8g$ece$1@news.eusc.inter.net>...

Change the IC to check it!

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"J.Oppermann" <me@privacy.net> wrote in message
news:c6ocqb$dn7af$1@ID-67386.news.uni-berlin.de...
Perhaps anybody has some experience with the "older" TDA3565.
I have the datasheet, but that's a bit too brief for me as I happen to have
not
too much experience with TV-Electronics.

In the "S-Video to RGB Converter" where the IC is used the TDA3565 gives no
RGB
output anymore. Only about 1.5V DC on Red. It gets quickly quite hot (about
50-60°C I'd estimate) even though the datasheet says sth about 1W power
consumption, it makes me considering a damaged IC...

Its probably fried. I have a few spares, so E-mail me if you want one
(pulls from dead boards)

-A

The adjustment voltage on pin 6 (contrast - actually 1-4V) is pulled down to
about 0.5V. I was wondering if this might indicate a damage of the IC, or a
feature that might be some kind of output protection.

Before the RGB output "vanished" I got a very dark picture (voltage on pin 6
was
already "pulled down").

Funny enough, as I disconnected the poti from pin 6 to check if it was
providing
the correct voltages (i.e. 1-4V) - which it does. Suddenly the input on pin
5
(saturation) pulled the voltage down to 0.5V instead.

maybe somebody can give me some advice?
TIA Jo'