Please help, what does gt abbreivation mean pcb what is the components name?

Billy1234510 · May 28, 2017

Hi everyone,
I've never posted to forums before but basically I have a pcb from a soundbar, I believe I have tracked down the problem, I'm an absolute novice so I may be completely wrong, it appears to be a zener diode to me, but it has no part number to order a new one, the only information I have is gt900 written on the pcb from where I removed the component.
Please see pictures one is of component the other is of the board.
I have no idea for gt stands for so please help so I can possibly order a new one and than retest the board once its in place.
Thanks in advance.

alec_t · May 28, 2017

Welcome to ETO!
My guess is it's an over-voltage spark gap, judging by the symbol on the pcb and its position close to what looks like a common-mode choke at the circuit mains supply input.
What makes you think it is faulty?

Billy1234510 · May 28, 2017

alec_t said:
Welcome to ETO!
My guess is it's an over-voltage spark gap, judging by the symbol on the pcb and its position close to what looks like a common-mode choke at the circuit mains supply input.
What makes you think it is faulty?

Because I thought it was a diode and when plugged in it had no voltage going through it either way, also in and out of the circuit it had no continuity, there was power to what I thought was a transformer of sort, the copper thing I'm guessing is the component you're referring to as a common mode choke?
P.s thanks for speedy reply.

alec_t · May 28, 2017

Billy1234510 said:
a transformer of sort, the copper thing I'm guessing is the component you're referring to as a common mode choke?

Yes, that's the choke.

Billy1234510 · May 28, 2017

alec_t said:
Yes, that's the choke.

Oh okay, so this may be a stupid question but if it's just a voltage gap can it be replaced by something else or have I got to try and track down what that part is? Thanks

manoj soorya · May 28, 2017

Its a Spark Gap Diode....

alec_t · May 28, 2017

Can't you put the original part back? Your meter readings are what would be expected for a good component.

Billy1234510 · May 28, 2017

manoj soorya said:
Its a Spark Gap Diode....

Thank you, do I have to do something complicated to work out the value for it? So I can buy a new one thanks in advance.

manoj soorya · May 28, 2017

Check this link and press "Like button" if this post is usefull...

**broken link removed**

Regards Manoj

Billy1234510 · May 28, 2017

manoj soorya said:
Check this link and press "Like button" if this post is usefull...

**broken link removed**

Regards Manoj

Thank you will do when I get a minute thanks

tronitech · May 28, 2017

...and just for your information your device should work without it, if it isn't, you have further problems.

Billy1234510 · May 28, 2017

tronitech said:
...and just for your information your device should work without it, if it isn't, you have further problems.

Yeah I need to inspect the other diodes, I did think when it was mentioned what it was I was thinking couldn't I just put a jumper in but didn't want to sound too idiotic

atferrari · May 28, 2017

Are you sure that a jumper will not alter things?

Billy1234510 · May 29, 2017

atferrari said:
Are you sure that a jumper will not alter things?

I'm not sure, but if there was a component in place I'm sure it would be needed otherwise it's a waste isn't it? But I have no idea.

Billy1234510 · May 29, 2017

manoj soorya said:
Check this link and press "Like button" if this post is usefull...

**broken link removed**

Regards Manoj

Upon checking that site you look very much correct in your analysis of what it is, one stupid question so forgive me but I take it as its a normal 240v in power supply it will require the 160-240v but how do I know which current and capacitance value I should get? Thanks in advance

manoj soorya · May 29, 2017

Billy1234510 said:
how do I know which current and capacitance value I should get?

you can also download the datasheet from that site... I think.

manoj soorya · May 29, 2017

This is one file I download...

Check this out....

manoj soorya · May 29, 2017

The site shows...

SCB-251M
Packaging： Voltage：250(200~300)V
Current：1000A Clamp Voltage：
Capacitance：1.0pF Power：

manoj soorya · May 29, 2017

I think its not a necessory component in your power supply. !!!

Billy1234510 · May 29, 2017

manoj soorya said:
I think its not a necessory component in your power supply. !!!

so I could just put a wire or some solder between the two points instead? Thanks

Please help, what does gt abbreivation mean pcb what is the components name?

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