Help me troubleshoot an amp using STK461 chip

noodle_snacks · 1st July 2006, 04:37 PM

I have aquired an amplifier with one working chanel, and one channel that seems to stick to one power supply rail (DC voltage). It uses an STK461 chip amp and the number and structure of the components inside looks relatively simple. Whilst i can aquire a replacement chip i am wondering what other tests i should run or common faults to look for before i go buying a chip that i don't need. Any pointers or links to tutorials etc?

jaycee · 2nd July 2006, 02:22 AM

There's very little externally to go wrong with these chips. The only thing I can think of is to check that the DC isn't coming from a preamp stage (eg a missing rail to one of the opamps). This is unlikely though.

It is likely the chip is damaged possibly due to a short on the channel. Replacing the chip is the most likely fix.

Leolabs · 3rd July 2006, 02:49 AM

Maybe you need this.

sasmit · 3rd July 2006, 11:24 AM

The chip is damaged,I have had simmilar experiences with STK series IC's ~ STK 459 and 4141 ,these chips are very sensitive to shorts in the output.But I doubt if you will be able to obtain a genuine STK 461 as these became obsolete arnd 10 years back...

ostie01 · 3rd July 2006, 11:33 AM

The chip you're looking for is available at http://pacificsemi.com/search.php for $6.00 each.

Just an advice, when you install those kind of chip, place an alligator clip with a wire at each pin ,hook up to the ground .Just move the clip from pin to pin when you touch the pin with the iron.These are very sentitive to static.

jamesjung21 · 5th July 2006, 01:46 AM

Quote:

These are very sentitive to static.

Mine was seriously abused with static energy but worked perfectly fine.

Watch out for counterfeit STKs by the way folks

James

noodle_snacks · 5th July 2006, 09:37 PM

my supplier says they sell STK461, I will buy a replacement chip, remove the old one and see how i go. The old one has lots of pins, is the best way to remove it to snip the pins at the base then remove, then pull the pins out individually?

ostie01 · 5th July 2006, 09:53 PM

Ya, cut those with wire cutter, will be a lot easier,but again, be careful with the iron when you touch the pins from the new IC, ground those pins

noodle_snacks · 5th July 2006, 10:44 PM

What is the best way to ground the pins? Run an alligator clip to somewhere (where), or do i just keep them all connected (so no voltage between the pins)? Sorry for being a tad ignorant.

ostie01 · 5th July 2006, 10:58 PM

Just connect to case or body of the amp

1st July 2006, 04:37 PM	#1
noodle_snacks diyAudio Member Join Date: Mar 2004 Location: Hobart, Tasmania	Help me troubleshoot an amp using STK461 chip I have aquired an amplifier with one working chanel, and one channel that seems to stick to one power supply rail (DC voltage). It uses an STK461 chip amp and the number and structure of the components inside looks relatively simple. Whilst i can aquire a replacement chip i am wondering what other tests i should run or common faults to look for before i go buying a chip that i don't need. Any pointers or links to tutorials etc?

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2nd July 2006, 02:22 AM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	There's very little externally to go wrong with these chips. The only thing I can think of is to check that the DC isn't coming from a preamp stage (eg a missing rail to one of the opamps). This is unlikely though. It is likely the chip is damaged possibly due to a short on the channel. Replacing the chip is the most likely fix.

3rd July 2006, 11:24 AM	#4
sasmit diyAudio Member Join Date: May 2006	The chip is damaged,I have had simmilar experiences with STK series IC's ~ STK 459 and 4141 ,these chips are very sensitive to shorts in the output.But I doubt if you will be able to obtain a genuine STK 461 as these became obsolete arnd 10 years back...

3rd July 2006, 11:33 AM	#5
ostie01 diyAudio Member Join Date: Mar 2005 Location: quebec	The chip you're looking for is available at http://pacificsemi.com/search.php for $6.00 each. Just an advice, when you install those kind of chip, place an alligator clip with a wire at each pin ,hook up to the ground .Just move the clip from pin to pin when you touch the pin with the iron.These are very sentitive to static.

5th July 2006, 09:37 PM	#7
noodle_snacks diyAudio Member Join Date: Mar 2004 Location: Hobart, Tasmania	my supplier says they sell STK461, I will buy a replacement chip, remove the old one and see how i go. The old one has lots of pins, is the best way to remove it to snip the pins at the base then remove, then pull the pins out individually?

5th July 2006, 09:53 PM	#8
ostie01 diyAudio Member Join Date: Mar 2005 Location: quebec	Ya, cut those with wire cutter, will be a lot easier,but again, be careful with the iron when you touch the pins from the new IC, ground those pins

5th July 2006, 10:44 PM	#9
noodle_snacks diyAudio Member Join Date: Mar 2004 Location: Hobart, Tasmania	What is the best way to ground the pins? Run an alligator clip to somewhere (where), or do i just keep them all connected (so no voltage between the pins)? Sorry for being a tad ignorant.

5th July 2006, 10:58 PM	#10
ostie01 diyAudio Member Join Date: Mar 2005 Location: quebec	Just connect to case or body of the amp

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