27" thunderbolt display power issue

Hi guys,

About 6 months ago I acquired a 27" thunderbolt display that was being

thrown out to e-waste from a advertising/graphic design company - it was

marked as "not working".

I took it home, plugged it into my 2012 MBP & it worked perfectly for 2-3 months.

After that time, I noticed it would occasionally cut out/lose power.

Initially I had the through power connected to my laptop to charge it as

well, but after it started cutting out I disconnected the magsafe power

to the laptop from the screen.

Now it only works for a few hours at a time, or a day or so if Im lucky.

The only "quick-fix" Ive noticed is, when it cuts out, I disconnect the

screen power plug to the outlet & slowly plug it back in. This

creates a small electrical arc which seems to revive the PSU in the

screen & then it works again...for a few hours or a maybe a day.

Talking to my father who has experience with power & electronics, he

seems to think there is some sort of dry solder somewhere as the

unplug/plug back in arc revives it.

Has anyone had a similar issue? Or experience with something similar?

At this point, the next step would be to open it up & inspect the solder points on the PSU.

If that doesnt work, then a replacement PSU...?

Thanks in advance