TP Link TL-SG1016PE

[silentkav]

Hello,

After a recent storm I have a TL-SG1016PE switch that wont power on. This switch has a separate power board from the actual network switch board. There is no voltage at the leads that go from the power board to the switch board.

All the components look good except for 1. There is a component on the board labeled R15 that is burnt. I've been looking to identify this resistor as a start and have had no luck to date. Any pointers would be appreciated.

[stj]

Re: TP Link TL-SG1016PE

is the fuse good, is RV1 shorted?
and check the parts mounted on the heatsink on that side

[silentkav]

Re: TP Link TL-SG1016PE

RV1 is good

F1 seems to be shorted

The rest appears to be good.

So F1 is a start but R15 is a concern as it's melted and I don't know what it's replacement is.

[stj]

Re: TP Link TL-SG1016PE

f1 is supposed to be shorted,
RV1 shouldnt give any reading.
R15 melted because something it feeds shorted-out
probably on the heatsink

[captainKKK]

Re: TP Link TL-SG1016PE

Is the D16 burnt?

[silentkav]

Re: TP Link TL-SG1016PE

D16 is good.

So far... just F1

and R15 (melted) but still returns a resistance value when measured. (9.17 ohms)

[sam_sam_sam]

Re: TP Link TL-SG1016PE

You need to find the switching power supply regulator ic chip there should be a low value capacitor or capacitors near check with a ESR meter if you do not have a replace them see if powers on or not

[momaka]

Re: TP Link TL-SG1016PE

and R15 (melted) but still returns a resistance value when measured. (9.17 ohms)

That's too high.
This is the current-sense resistor for the primary-side APFC MOSFET (Q1). Typical values are less than 2 Ohms and often sub-1 Ohms. So at 9.17 Ohms, it's definitely bad. I suspect you will find the Q1 to be bad (shorted Drain to Source pins) as well. And if more unlucky, this could have taken out U1 too.

But let's not get ahead of ourselves. Remove R15 and check Q1 in circuit.

Also, since this is an APFC PSU, you may want to check the two input HV electrolytic caps for a short-circuit across them.

[jiroy]

Re: TP Link TL-SG1016PE

R15 is labeled (or what's left) , R from the left , and that means it's in the range between 0,1 to 0,9 ohms ..From its size , it's a 2 watts resistor .
When you finish testing all the probable faulty components around , you can try with a value and label like for an example R200 (0.2 ohms) , and if you have a variac ,it's better to use while testing .