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Dell U2413 turning off

Dell U2413 turning off I recently bought a used Dell U2413 monitor. All were working fine within my initial use, though a few days after, the monitor started to turn itself off randomly within half an hour to an hour of use-- no power led, and would turn back on after a couple of minutes. After some troubleshooting, it appears that the power supply, or something within the power supply circuit is overheating, thus causing the monitor to turn off.

Asked by: Guest | Views: 114
Total answers/comments: 4
mcgyver89 [Entry]


Rep: 109


mcgyver89 [Entry]

"So the two thyristors are the answer for this problem. Q971 and Q972. Unforunately the original MCR part had a non-standard arrangement of Gate, Anode, Cathode (K) leads, and there are none I could find with the correct order, so you MUST bend the pins to have the right one go to the correct hole on the board, changing the Littlefuse Thyristor from KGA pin order to GAK order to match the original part - you CANNOT use the default arrangement.

The replacement part you want is Littelfuse S4X8ES2, and mouser.com has them for 45 cents each - the $7.99 shipping will be the most expensive part of this. I ordered 4 since they were so cheap so I had spares in case I accidentally broke a pin in the bending process.

The data sheet for the part is here: https://www.mouser.com/datasheet/2/240/L...

To open the case on your Dell U2413, I highly recommend the ifixit kit with the guitar pick things (or actual guitar picks). They get the case open without marring it.

I’ve attached a few pictures showing where the parts are on the power supply board in the monitor and also how to bend the pins of the replacement thyristor so it has them in the correct order when you solder it onto the board. This will stick up a lot higher than the original due to the bending (so you don’t have any of the legs touch - DO NOT HAVE THEM TOUCHING EACH OTHER AT ANY POINT), but that’s no problem.

Thank you Dell for cheaping out on parts, cutting another corner that your customers have to figure out to avoid throwing a perfectly good monitor away."
mcgyver89 [Entry]

It has been running for two days without turning off. I put new thermal paste on the K15A60U and I attached a radiator to the LD7904jgp7
mcgyver89 [Entry]

"Hi. This is not exactly the same problem. My monitor doesn’t turn on anymore. I opened it and checked the boards. It seems there has been something going on in power input circuit and couple of components has blown. Is it possible someone could provide me original values for C909 and FB901. The rest I can still read. If one of you wonderful persons could help me out with these components, I could start fixing the monitor.

Thank you very much."