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Old 08-08-2018, 07:00 PM   #1
Ali101
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Lightbulb T.C.Star TCS3556 Speakers PCB Burn

Hello All,
As subject says, i have T.C.Star TCS3556 Speakers and yesterday my speakers sudden make big noise sound and some burn smell come out from inside with little smoke, i close speakers & open it to check whats burned inside, i find out little burning near to big black Capacitator as marked in below picture, since its already little burn from middle part so i have no idea what part is it which need to replaced, will appreciated if any one can help to tell if its Zener diode or just direct connection, if its Zener diode then which size i need to replace,
Thanks.
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File Type: jpg PCB.jpg (245.6 KB, 20 views)
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Old 08-08-2018, 07:51 PM   #2
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Default Re: T.C.Star TCS3556 Speakers PCB Burn

wow, that board really looks like it's seen its better days. You'll likely need to check all the semiconductors for shorts. Not sure what you're pointing to there, but it looks like some inductor and these shouldn't really burn...
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Old 08-08-2018, 08:35 PM   #3
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Default Re: T.C.Star TCS3556 Speakers PCB Burn

They look like ferrite bead inductors, we need good clear focused pictures of the whole bottom side of the board too.
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Old 08-08-2018, 08:52 PM   #4
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Default Re: T.C.Star TCS3556 Speakers PCB Burn

Hi budm,
here is back side of board full pic, hope it will help
Thanks.
Attached Images
File Type: jpeg PCB-back.jpeg (243.1 KB, 12 views)
File Type: jpeg burn.jpeg (189.4 KB, 16 views)
File Type: jpeg btm.jpeg (149.0 KB, 11 views)

Last edited by Ali101; 08-08-2018 at 09:19 PM..
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Old 08-08-2018, 09:40 PM   #5
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Default Re: T.C.Star TCS3556 Speakers PCB Burn

OK, they are jumpers for the AC from the power transformer for feeding the bridge rectifier circuit, you can see J3 which looks corrode, and then the jumper that burn up. The board is given an option to install inductors L1 and L2 or put jumpers instead
https://www.badcaps.net/forum/attach...3&d=1533783069
https://www.badcaps.net/forum/attach...4&d=1533784756

You can easily see how the two jumpers are connected.
It looks like you are in humid environment, I can see rusted screw heads.
You should check all four rectifier diodes D1, D2, D3, and D4 (BTW those diode legs look corroded) to make sure they are OK, then clean up the burnt areas, remove both jumper wires and put in the new one, resolder any solder joints that corroded, any component's legs that are corroded.
Check the resistance between the two legs of each lytics filter caps right next to the rectifier to make sure they do not show very low resistance.

Last edited by budm; 08-08-2018 at 09:42 PM..
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Old 08-08-2018, 09:55 PM   #6
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Default Re: T.C.Star TCS3556 Speakers PCB Burn

Thanks budm, indeed i am in humid environment, Taiwan weather is full with humid, let me follow your instructions & get back to you with results,
Thanks.
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Old 08-09-2018, 06:31 PM   #7
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Default Re: T.C.Star TCS3556 Speakers PCB Burn

Hi budm,
Your instructions & help fixed my issue, Speakers working again, alot of components was rusted & got broken while cleaning PCB & i replaced all of them, & now everything working back like charm,
Appreciated your kind help & thanks alot, you are always very helpful, God Bless you bro,
Cheers.
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Old 08-09-2018, 10:26 PM   #8
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Default Re: T.C.Star TCS3556 Speakers PCB Burn

Glad to hear you got it fixed and the follow-up.
I always wonder how well the stuff last in the humid area, seems like you will have lots of stuff breaking down.

Last edited by budm; 08-09-2018 at 10:35 PM..
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Old 08-09-2018, 11:35 PM   #9
Ali101
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Default Re: T.C.Star TCS3556 Speakers PCB Burn

indeed here humid is scary, since Taiwan is a island after all & full with humility, so stuff got mad after two or three years & here fixing shops are intensely expensive so have no choice but DIY, appreciated your help budm,
Thanks.
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