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vahakn 14th July 2012 10:01 PM

HELP! My freind has 'blown' his T amp - what to test for with my multimeter...
Patient on the surgery table: TOPPING TP10 Mk4
PCB ver.7 2010.04.22

Someone allegedly connected a 12v battery charger (that delivers 18v?)
To the DC12v input of the amp. Since then it has not worked and stinks of burny bad things.

Once disasembled I noticed the DC wires connecting the Power Switch were twisted and touching !Making an obvious short circuit! Once separated and free the amp still does not work.

When connected to power, what should I test for, across which terminals of which component and with which setting, with my multimeter? > To find out what component is ****** and what I can replace?

Thanks so much!!!
You guys / girls are the best



theAnonymous1 14th July 2012 10:51 PM

The TA2024 IC is most likely toasted. Good luck replacing it if you're not experieced with this type of thing since the IC's heat slug is soldered to the PCB.

vahakn 14th July 2012 11:02 PM

Oh yes! indeed. Now I inspect it, I can see that its burnt the **** out! Legs 7 8 11 & 12 have been melted and totally blown away.

Lame. D6 and D7 have been wounded from the blast a bit though maybe only on the outside.

Is it worth trying to fix if ive never soldered anything so small?

vahakn 14th July 2012 11:02 PM

Why isnt there something that stops this from happening like a resistor or fuse?

Pano 14th July 2012 11:32 PM

Because blowing these up is unusual, they have built in short circuit protection. Don't know what happened here.
This will be hard to fix if you don't know how to solder SMD and slug down chips.

theAnonymous1 14th July 2012 11:39 PM

Like I said, if you don't have much experience then it will be a PITA to replace. It will take a lot of heat to remove the IC and if not done correctly the PCB will get damaged. You really need a hot air station to do it right.

A resistor or fuse won't help with overvoltage. A SCR crowbar circuit would work, but that's a lot of added cost for the manufacturer (keep in mind where these are made).

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