Cant find the value of this resistor!!

[mariosmax]

Hello the the Badcaps community.

i am a new member and this is my first post. This post was written after a search in the forum for the information i need. Unfortunately i am doing something wrong so that is why i need your help / knowledge.

As known resistors can be identified from the band colors ( there are plenty calculators online for the lazy ones here).

I found this burnt resistor (?) on a power supply board of a Benq Monitor G2110W and i want to replace it. But i cant calculate the value of it. If i am seeing right that is a 5 band resistor with the following colors

Red, Black, Grey (or Silver), Gold (or Orange), White... Fact is that i the 5th band cant be white and the 3rd can not be Silver.

It is maybe a stupid question but we all have those too right ? How can someone identify from which side should he read the colors from left to right?
Online i found this info "If you’re uncertain from which side of the resistor to read the colors, start with the side closest to the color stripe. The first stripe is usually painted very close to the edge of the resistor; the last stripe isn’t as close to the edge."

But both sides seem exactly the same to me.

[budm]

Re: Cant find the value of this resistor!!

0.2 Ohms.
Can we see the straight shot pictures of the whole top and bottom side of the board?
You have shorted component that caused that resistor to burn up.
That resistor is more likely to be for the Source pin of the MOSFET.

[R_J]

Re: Cant find the value of this resistor!!

looks like a .2 ohm 5% 1/2 watt

[keeney123]

Re: Cant find the value of this resistor!!

Best I could figure is Red, Black, Silver, Gold, White 20 X .01 = 0.02 gold is +/-5%, white indicates it is fusible (0.02 ohm +/-5% fusible.)

[budm]

Re: Cant find the value of this resistor!!

"20 x .01 = 0.02"
20 x .01 = 0.2

[keeney123]

Re: Cant find the value of this resistor!!

"20 x .01 = 0.02"
20 x .01 = 0.2

Yea, I am making a lot of simple math mistakes this week. I am not sure why perhaps it's old age settling in. Thanks BudM

[mariosmax]

Re: Cant find the value of this resistor!!

Thank you all for the interesest and your time.

Here the pics of the board. I have marked with red boxes the place where this resistor was.

[PeteS in CA]

Re: Cant find the value of this resistor!!

Interesting PCB layout, not sure having the AC inlet near the O/P rectifier heatsink is good for EMI. Looks like it's a self-oscillating discontinuous flyback design. built in mid 2008. I'm not sure that burnt resistor, which is very low value (as others have indicated), is in the Source circuit of the switch MOSFET. R815 is also a very low value resistor, 1W, and closer to Q804.

[redwire]

Re: Cant find the value of this resistor!!

I checked another Benq service manual and they spec the resistor as "RST MOFR 0.2 OHM +-5% 2WS"

MOFR is metal-oxide fusible+flameproof resistor, 2W.

It probably goes to the switching MOSFET (source), which has shorted and needs to be replaced.

[budm]

Re: Cant find the value of this resistor!!

That is fusible resistor, the B+ of the output of the bridge/main filter cap is connected to one end of that resistor, the other end feeds the SMPS circuit, the SMD SMPS IC802 is on the bottom side of the board.
So you better check the MOSFET resistance between S-D pin of Q804. R815 is the resistor for the Source pin so check that resistor too.