LED power supply thermal fuse blown

[davidjk]

hi again,
i have a 12v 6amp LED power supply that does not work. i opened it up and i can see that what appears to be a thermal fuse that appears to have blown
The LEDS are a 5 meter 5050 300 LED and apparently draw 2 amps.
i am happy to replace the fuse, but i do not know what rating to get. the glass surround is shattered and unreadable
could you if possible let me know what rating thermal fuse to get

the power supply is an ly 1206
http://www.pchub.com/uph/laptop/659-130555-27361/PCH-OEM-Power-AC-Adapter-Compatible.html

This is the Fuse i mentioned

and the power supply


Many thanks

 

[Bluejets]

Says 1.6A on the back cover photo.

 

[davidjk]

Says 1.6A on the back cover photo.

that is the input, the output is 6A

 

[Bluejets]

Fuse to me looks to be located very close to the input.
Output is down the other end.
Other than that, what is you query about then..? i.e. you already seem to know your answer

 

[davenn]

OK so you want a fuse rated at 240VAC and ~ 1.5A
it isn't a thermal fuse, as you have already stated its glass encapsulated and also it isn't in contact with any components

Be aware that replacing the fuse may see its instant demise as well because of a fault further into the circuit
possibly the bridge rectifier which appears to be located between the heatsink and that large electrolytic capacitor towards the top left corner of pic 2

Dave

 

[(*steve*)]

Yeah, I'd replace the fuse and then measure the resistance across the mains pins. (with some experience you can do this before replacing the fuse, but measuring across the correct points on the board.)

If the resistance is very low (and stays that way) then a failed bridge rectifier is one option. It's also possible that the mosfet has failed. Both of these are relatively easy to diagnose.

 

[davidjk]

thank you , i will give it a try.