Want to replace resistors myself, but need an advice

Hi guys

It has been a long time since I soldered something, but with COVID-19 decided to dust off my knowledge about electronics.

My air-fryer Philips XXL (5 years old) stopped to switched on (after I felt the smell of something burnt out).

I found resistors got burnt - see pictures

I need your help what Om and W value of those ones?

Looks like they have 4 bands: Orange, Black, Black, Gold, which is 30 Om.

Not sure whether it is correct. Plus, not sure how to find W.

Thanks in advance for your help,

Vlad

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dougw over 5 years ago

The power rating can usually be deduced from the physical size.
These look to be about 1W. but I'm not sure from the picture exactly how big they are.
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They don't look burned enough to be smelling burnt - you can take a close sniff to see if they still smell burnt.
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hugohu over 5 years ago in reply to dougw

They actually look closer to 3W ones... I have some 5W ones that seem bulkier than it, but if you go on the safe side maybe just get 5W ones, more pricy but it's better than using a 1/4W.

They also don't look burnt, as you said..

The transformer's plastic looks like it's been a bit melted at one point. Maybe.
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Jan Cumps over 5 years ago in reply to hugohu

hugohu wrote:

...
The transformer's plastic looks like it's been a bit melted at one point. Maybe.
A melted transformer looks bad and smells bad. A burned transformer smells burned. This one looks OK. The shrink hasn't discoloured.

There may be a fuse hidden inside the transfo primary windings. A practice some manufacturers do to avoid meltdown of a transfo. That's easily detected with a continuity test.
In that case, don't fix it. The transfo has heated up beyond reasonable temperature and should not be fixed. That's why the fuse isn't replaceable. You can fix it but you should not.
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hugohu over 5 years ago in reply to Jan Cumps

Hmm, my bad.
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hugohu over 5 years ago in reply to Jan Cumps

Hmm, my bad.
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