Mag Lt916s

[IRShifty]

This monitor is not powering on at all. I pulled out the power supply board and replaced 4 swollen caps. All caps are stock Samxon and were replaced with Nichicons from digikey. I replaced 2 220uf 25v and 2 470uf 25v. I am wondering if i should replace the other 6 Samxon caps even though they look visually good? Or is their another known problem with this model not powering on for some other reason?

[EGuevarae]

Re: Mag Lt916s

This monitor is not powering on at all. I pulled out the power supply board and replaced 4 swollen caps. All caps are stock Samxon and were replaced with Nichicons from digikey. I replaced 2 220uf 25v and 2 470uf 25v. I am wondering if i should replace the other 6 Samxon caps even though they look visually good? Or is their another known problem with this model not powering on for some other reason?

You are already there. Change them all. Just repaired a dead Westinghouse 19" with all good looking Samxons inside, and yet it was dead.

[EGuevarae]

Re: Mag Lt916s

This monitor is not powering on at all. I pulled out the power supply board and replaced 4 swollen caps. All caps are stock Samxon and were replaced with Nichicons from digikey. I replaced 2 220uf 25v and 2 470uf 25v. I am wondering if i should replace the other 6 Samxon caps even though they look visually good? Or is their another known problem with this model not powering on for some other reason?

Did you check the main fuse on the AC input? Or the other two that are present, one for the 5v output to VBoard and the other for the inverter?
See the attached picture:



If there's no 5V for the main logic board, the monitor would be dead.

[IRShifty]

Re: Mag Lt916s

Replaced all capacitors, checked main fuses, i have a different board then you posted but I did check some of the fuses and all the ones I tested passed fine, except the round one that is circled in the picture.

Also: there seems to be no power going to the main board so a fuse sounds likely.

[Nama]

Re: Mag Lt916s

Why did you not check the main fuse?.
That would be the first one I would check before ever looking at the caps.

If you have a voltage multimeter put it on OHM setting and check that fuse for continuity.

Or use a bread tie or something similar to jumper that main fuse. tab to tab. See if you get power.

Be carefull your getting a full 110v at that fuse.

Sorry if I am telling you things you already know. I am no pro.
Jacob

[EGuevarae]

Re: Mag Lt916s

Why did you not check the main fuse?.
That would be the first one I would check before ever looking at the caps

That's what I suggested in post #3. No AC input = NO DC output

except the round one that is circled in the picture.

That's the Main AC input fuse