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Old 18th February 2017, 10:00 AM   #1
Myint67 is offline Myint67  Singapore
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Default Why Nchanel gate resistor got fire

Hi guy
Why Nchanel gate resistor got fire ?

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Old 18th February 2017, 10:08 AM   #2
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Join Date: Nov 2011
Location: UK
We all love to help but you need to provide a bit more information. A schematic with the affected resistor would help. Alternatively the unit model number and the part number that is affected.

However, the only way that a gate resistor can pass sufficient current to burn is for the FET to fail.
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Old 18th February 2017, 10:20 AM   #3
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Fuel, air, spark.
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Old 18th February 2017, 10:52 AM   #4
Myint67 is offline Myint67  Singapore
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Here my F5 turbo v2 Nchanel got fire ,now almost two time .

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Old 18th February 2017, 12:36 PM   #5
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Location: Germany
Bad soldering in general, no decoupling cap C1 on power rails while necessary, no mechanical support of PCB's with standoffs (why would there be mounting holes?) no washers on every flatpack, overheated solder pads, soldering wires directly to boards so risk of shorts by a loose stranded wire, no cleaning of PCBs so no good view on possible shorts etc. No insulation sleeves on the NTC so again risk of shorts/accidents. Bad soldering of NTC combined with too long excess wires. If you look carefully you will see loose stranded wires at some spots and I think I even see a near short. Use good quality connectors and have less risk. Sloppy wire routing too. Forget the BS on connectors having an influence if you like reliability and love your speakers. There is printed a footprint on the PCB for connectors with a reason.

Many wrongs in craftsmanship. Sorry. If you choose to work sloppy you get risk in return. If you choose to keep on working like this it is advisable to buy/build a speaker protection circuit as your speakers are already demonstrating on the street with banners "loudspeaker lives DO matter !".

Looks like oscillation but considering the many irregularities it might be something different. First check all errors, solder in C1 as a minimum if you like to live dangerously. Best would be to take your time and work cautiously to make it a good functioning and reliable device. Both for wallet and pride.
It's only audio. Member of the non modular PCB design committee

Last edited by jean-paul; 18th February 2017 at 12:57 PM.
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