Need help identifying this burnt out resistor

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Y-G-Bk Gold
47 0 = 47 * 10^0 = 47 ohms 1/4W 5% ..edit erhm 2W

Tony Stewart said:

Y-G-Bk Gold
47 0 = 47 * 10^0 = 47 ohms 1/4W 5%

Click to expand...

How did you arrive at 1/4W?.

Also you ignored the last band, blue, which is presumably a temperature coefficient band?, 10ppm/K.

I'd also test the resistor, it doesn't look very burnt out.

45 Ohms will be relatively more expensive in single qty yet only 4.2% higher current limiting .

Considering AC voltage can vary 10% and the part aged prematurely from thermal stress, the slightly reduced current with the higher resistance ought to be a suitable replacement. The thermal marks appear like they use a plastic metal film type so a WW will be more reliable. Metal-film has a lower thermal coefficient or PTC value (last band) which is not critical here but MF are worse for thermal resistance. So the resistor acts like a thermal fuse that failed prematurely. (unless your location has higher than normal Vac.)
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I recommend a 47 Ohm wirewound 2W 5% resistor. Choose a source with inexpensive mail order.
Adding a 1k 1/4W resistor in parallel to the 47 Ohm 2W will match the 45 Ohm 2W exactly and cost < $1.



Your photo looks like the 2nd band is more GREEN than purple but that depends on your lighting.

Nigel Goodwin said:

How did you arrive at 1/4W?.

Also you ignored the last band, blue, which is presumably a temperature coefficient band?, 10ppm/K.

I'd also test the resistor, it doesn't look very burnt out.

Click to expand...

After this picture assembled everything back together and when I plugged it in the resistor started smoking a bit.

artvandalai said:

After this picture assembled everything back together and when I plugged it in the resistor started smoking a bit.

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It's VERY, VERY unlikely that a resistor will mysteriously start smoking, if the resistor is smoking it's most likely there's
a fault causing it to happen, the resistor smoking is likely to be a symptom, not a cause.

Nigel Goodwin said:

It's VERY, VERY unlikely that a resistor will mysteriously start smoking, if the resistor is smoking it's most likely there's
a fault causing it to happen, the resistor smoking is likely to be a symptom, not a cause.

Click to expand...

Agreed. Kindly check the board thoroughly. Otherwise, replacement may fail too.

Post a well focused pic of front and backside of board.