Tda7293

lasstss · 10th December 2004, 09:44 AM

My son has a Marshall guitar amp thay keeps blowing fuses. It was determined that the small pc board that holds the TDA7293. Is the culprit. I assume the chip has shorted. The problem is that this little board$200.. has been replaced twice. Any ideas why this chip would blow and are their any alternatives like a stk4048?? This is getting expensive. I looks like a pain to unsolder and reinstall.

Markje · 10th December 2004, 12:17 PM

No it's not, cut away the TDA and then desolder the remaining wires. Turn the board around and make sure al holes are clear, so you can easily put a new TDA in place. Then put the new TDA in and connect it to the heatsink before you solder. After that, solder the connections.

Greetz Mark

richt · 14th December 2004, 05:36 AM

hi

before installing the tda ,put heatsink compound (white cream) on the back of the tda because that tiny chip generates a lot of heat & thats the most common failure .
try putting a cooling fan if your son plays really LOUD or with another extension cabinet (extra speaker and lower impedance
generates more heat)

check if the tda seats very firmly on the heatsink (very important)
that tda costs around 20 bucks ,depending on your location.

richt

10th December 2004, 09:44 AM	#1
lasstss diyAudio Member Join Date: Dec 2004 Location: Maryland	Tda7293 My son has a Marshall guitar amp thay keeps blowing fuses. It was determined that the small pc board that holds the TDA7293. Is the culprit. I assume the chip has shorted. The problem is that this little board$200.. has been replaced twice. Any ideas why this chip would blow and are their any alternatives like a stk4048?? This is getting expensive. I looks like a pain to unsolder and reinstall.

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10th December 2004, 12:17 PM	#2
Markje diyAudio Member Join Date: Jan 2004 Location: The Netherlands	No it's not, cut away the TDA and then desolder the remaining wires. Turn the board around and make sure al holes are clear, so you can easily put a new TDA in place. Then put the new TDA in and connect it to the heatsink before you solder. After that, solder the connections. Greetz Mark

14th December 2004, 05:36 AM	#3
richt diyAudio Member Join Date: Nov 2001 Location: puerto rico	hi before installing the tda ,put heatsink compound (white cream) on the back of the tda because that tiny chip generates a lot of heat & thats the most common failure . try putting a cooling fan if your son plays really LOUD or with another extension cabinet (extra speaker and lower impedance generates more heat) check if the tda seats very firmly on the heatsink (very important) that tda costs around 20 bucks ,depending on your location. richt

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