TDA7294 in JVC compact system defective?

[Bruno Willi]

Hi,

I'm stuck repairing a JVC EX-TD55R compact system. The sytem has some
boards, the one for the bass amplification seems to be defective. It
contains a TDA7294 audio amplifier, which is getting hot very quick.
I removed most of the caps on this board, I replaced some caps on the
power-supply board, because some of them lost electrolyt. Power supply
on the TDA (-Vs, +Vs Signal, -Vs, +Vs Power) seem ok to me (- 19V,
+19V, -25V, +25V).

What could be the reason, why this IC is getting so hot (indeed it's
normal for this part to get hot because of the big heat sink), but I
think it's not normal that it gets so hot so quick (within 5 to 10
secs)?

Bruno

 

[JR3611]

We see a lot of them in Bose units, most of them are bad when they do that.
We sell them, $6.00 for 1

www.audiolabga.com


"Bruno Willi" <bruno*nospamplease*@brunowilli.de> wrote in message
news:sf1trv0rui2c1uf18dd5m8hcj8n5ncimso@4ax.com...

Hi,

I'm stuck repairing a JVC EX-TD55R compact system. The sytem has some
boards, the one for the bass amplification seems to be defective. It
contains a TDA7294 audio amplifier, which is getting hot very quick.
I removed most of the caps on this board, I replaced some caps on the
power-supply board, because some of them lost electrolyt. Power supply
on the TDA (-Vs, +Vs Signal, -Vs, +Vs Power) seem ok to me (- 19V,
+19V, -25V, +25V).

What could be the reason, why this IC is getting so hot (indeed it's
normal for this part to get hot because of the big heat sink), but I
think it's not normal that it gets so hot so quick (within 5 to 10
secs)?

Bruno