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Chip Amps Amplifiers based on integrated circuits

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Old 10th December 2004, 08:44 AM   #1
lasstss is offline lasstss  United States
diyAudio Member
Join Date: Dec 2004
Location: Maryland
Unhappy 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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Old 10th December 2004, 11:17 AM   #2
Markje is offline Markje  Netherlands
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
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Old 14th December 2004, 04:36 AM   #3
richt is offline richt  Puerto Rico
diyAudio Member
Join Date: Nov 2001
Location: puerto rico

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.

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