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Electronics => Beginners => Topic started by: casp3rtech on November 20, 2016, 11:37:18 pm

Title: Resistor color code help...
Post by: casp3rtech on November 20, 2016, 11:37:18 pm
I can't seem to find this thing no matter what.. Resistor fried on a TV power supply and I can't seem to make out the color code using the colors I see.. Maybe I am doing something wrong. From what I can see its red, black, gold, orange, black... All code generators are giving me an error and even if i do it manually, it makes no sense.
Title: Re: Resistor color code help...
Post by: Yansi on November 20, 2016, 11:54:54 pm
If the left most band is RED (really cannot tell for sure from a photo with incorrect white balance), then it is 0.2ohm resistor. Err.... was.
Title: Re: Resistor color code help...
Post by: Andy Watson on November 21, 2016, 12:00:29 am
I think the left band is brown. The gold band is a 0.1 multiplier, so it's a 1.0 ohm.
Title: Re: Resistor color code help...
Post by: Yansi on November 21, 2016, 12:06:51 am
Yeah youre right. My mistake.

Guess that was a current shunt from a switchmode power supply. If this one is fried, the mosfet and/or the controller IC might be as well.
Title: Re: Resistor color code help...
Post by: Brumby on November 21, 2016, 12:19:05 am
If you take the bit of gunk on the left end of the body as a reference, the white balance wasn't too far off.

Here's my effort at rebalancing...

(https://www.eevblog.com/forum/beginners/resistor-color-code-help/?action=dlattach;attach=272050;image)
Title: Re: Resistor color code help...
Post by: casp3rtech on November 21, 2016, 12:20:47 am
I have added two more while changing light settings on camera. This part is from a TV power supply that was damaged from power surge. So far I have found 3 bad capacitors, one fuse and this resistor. The power supply is massive and I can't find it anywhere! The model is BN44-00744A
Title: Re: Resistor color code help...
Post by: casp3rtech on November 21, 2016, 12:27:20 am
The bad components locations so far...
Title: Re: Resistor color code help...
Post by: Brumby on November 21, 2016, 12:32:57 am
I have added two more while changing light settings on camera.

For the lighting conditions - and my assumption that the gunk is white (or at least neutral) - your first photo was closest to correct white balance.

As such, I see the first band as brown.  The extra photos support this.