Hi i have a SMSL T-AMP model SA-50. I just accidently touching my RCA + plug with the speaker output of the AMP, i heared a little pop sound from my speaker.
Then i notice my left speaker volume is much softer than right side, it is very much lack of low frequency (less bass and deep vocal).
1. It is not speaker issue because i have swap left and right and the problem is still on the left.
2. It is the problem on the left speaker output
Can anyone point out which part of the amp possibly spoil and is it possible to repair? or i just get a new one.
Then i notice my left speaker volume is much softer than right side, it is very much lack of low frequency (less bass and deep vocal).
1. It is not speaker issue because i have swap left and right and the problem is still on the left.
2. It is the problem on the left speaker output
Can anyone point out which part of the amp possibly spoil and is it possible to repair? or i just get a new one.
Looking at the data sheet for the TDA7492 I suspect you have zapped the chip. Although it claims to be short circuit proof I'm not so sure about a short to ground (with it being a bridge type output) which is probably what happened with your RCA short. I can't see any of the output chokes going OC but I guess you should do some basic checks.
The circuit should be very similar to this,
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00205863.pdf
The circuit should be very similar to this,
http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00205863.pdf
The chip should be widely available. The problem will be whether you are able to replace an SMD device successfully,
TDA7492 - STMICROELECTRONICS - IC, AMP, AUDIO, CLASS D, 36POWERSO | Farnell United Kingdom
All you can do for faultfinding is check that your accidental short hasn't caused any print to go open circuit or one of the coils to go open.
TDA7492 - STMICROELECTRONICS - IC, AMP, AUDIO, CLASS D, 36POWERSO | Farnell United Kingdom
All you can do for faultfinding is check that your accidental short hasn't caused any print to go open circuit or one of the coils to go open.
I confirm out this by using my iphone or ipod as source and the sound is balanced and work perfectly like before.
Now the problem is in the airport express, howeve when i plug an earphone to the express i can't detect any problem, vocal is just centered and sounded good.
It only happened when i plug to smsl amp and earphone pick up the signal nicely, can anyone explain why ?
One of my guess is the airport express line out lost of some power on left side which to earphone still sufficient enough ? am i correct ?
Now the problem is in the airport express, howeve when i plug an earphone to the express i can't detect any problem, vocal is just centered and sounded good.
It only happened when i plug to smsl amp and earphone pick up the signal nicely, can anyone explain why ?
One of my guess is the airport express line out lost of some power on left side which to earphone still sufficient enough ? am i correct ?
It can also be a resistor. Had to ship a Lynx L22 soundcard across the atlantic just for a resistor change. I also thought it was an op amp so I replaced all the opamps. But that did not solve the problem. The resistors were the problem. Small buggers tho. Pretty hard to solder.
But everyone in these forums always talk about blown opamps in these cases.
But everyone in these forums always talk about blown opamps in these cases.
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