Need help to replace a resistor

Hi,

If you can share a high-res photo of the surrounding circuitry, on both sides of the board, then it is possible to make a better guess. It's very feasible that discoloration could have occurred. It also seems unlikely to be a 0.1 ohm resistor, but it's speculation unless more detail is provided.

Thanks shabaz, here are the images:

I've circled where it's connected to, which connects to the main power switch on the front panel.  Earlier I measured 3V AC, 0V DC  on that when it was connected to mains and powered off, and 0V AV, 0V DC when switched on, hope this helps?

Also robogary yes in 2nd pic I've circled a chip that probably also failed, the conformal coating had bubbles in it, it's a LNK304GN.  In fact these 2 components fail so often they're sold together: https://www.aliexpress.com/i/1005001758260213.html (which shows 100R).

Unfortunately not enough detail from the photos, the connection snakes off from the top side of the board, but I can't see where due to angle.

Anyway, it's a resistor directly off the Live connection, it is highly unlikely to be 0.1 ohm. Since you mention the LNK chip might have failed, then there's a good chance it is related, since the LNK circuit uses a fusible resistor connected to Live. 

See here (from LNK design guide PDF):

There's a high chance it could have been 100 ohm, or 10 ohm, but certainly not 0.1 ohm. 

You could check with a multimeter on the _unpowered_ board with _capacitors_discharged_first_ that the trace from the resistor goes to a diode and onward to an inductor and then to the LNK chip as shown in the LNK datasheet PDF:

If so, then you know that resistor has to be 100 ohm or 10 ohm. You could just try 100 ohm, and see if it works If it doesn't, then try 10 ohm.

I couldn't find a 100 ohm fusible resistor but if it is being used in that topology you could use a 68 ohm resistor, but don't blame me if it all goes up in flames or worse - I'm not providing advice here.

Here is a 10 ohm fusible resistor:

Unfortunately not enough detail from the photos, the connection snakes off from the top side of the board, but I can't see where due to angle.

Anyway, it's a resistor directly off the Live connection, it is highly unlikely to be 0.1 ohm. Since you mention the LNK chip might have failed, then there's a good chance it is related, since the LNK circuit uses a fusible resistor connected to Live. 

See here (from LNK design guide PDF):

There's a high chance it could have been 100 ohm, or 10 ohm, but certainly not 0.1 ohm. 

You could check with a multimeter on the _unpowered_ board with _capacitors_discharged_first_ that the trace from the resistor goes to a diode and onward to an inductor and then to the LNK chip as shown in the LNK datasheet PDF:

If so, then you know that resistor has to be 100 ohm or 10 ohm. You could just try 100 ohm, and see if it works If it doesn't, then try 10 ohm.

I couldn't find a 100 ohm fusible resistor but if it is being used in that topology you could use a 68 ohm resistor, but don't blame me if it all goes up in flames or worse - I'm not providing advice here.

Here is a 10 ohm fusible resistor:

Thanks very much for that, the chip left of center is a full bridge rectifier, it connects to that, then the cap is 10uF, 400V, and that connects to the D (Drain) pin.  I couldn't see any inductors though apart from the large one near the mains.

And that  design guide confirms it's used as a fuse, so will get a 100R 2W flame proof one (and not a 10W one...).  (I'm sure it was 100R based on measuring the bits of wire, see below).