Re: Samsung PS51E550 Y-Main

Well I got impatient and tried the board anyway and got a picture so I guess we can consider this solved. Hopefully it lasts. Cheers for the help!

Re: Samsung PS51E550 Y-Main



Thanks for the reply. Well this is strange (at least to me). When I measure my own blown board in Diode mode it shows a number, does the slightest of squeaks then shuts off. If I measure in 200 ohms i get a reading of 0.03.

When I measure the replacement board in Diode mode I get an initial reading of random numbers then after a second it shows 0L. Subsequent measurements I get 0L and it seems quite random to get a reading. 200 ohm I get nothing.

Perhaps I'm not doing it right, or have been sent a dud.
...

Re: Samsung PS51E550 Y-Main



Thanks for the advice. Since I purchased the replacement board I'm going to see if it works out before I potentially go further with the failed board. I'll be sure to tighten all the screw as I assume they are creating the ground loop, but as you may have figured I'm a bit of a noob, electronically speaking.



Hi, thank you also for the helpful advice. Could you be a little more specific please as to what I am testing for? Should I have the board installed and connected to the power board but not the Y-Buffer...

Re: Samsung PS51E550 Y-Main

Hi guys! I am attaching some images for sake of posteriority. Perhaps these will be useful for someone in the future.

The first is the model and pcb numbers. The second is a photograph of the Y-Main top side, the third is the bottom side and the fourth photo is of the large heatsink with the offending 'fets'?

I also have a question if anyone happens to be reading this. I have purchased a replacement Y-Main that is apparently in good working condition. Are there any precautions I can or should make, or tests that I can carry...

Re: Samsung PS51E550 Y-Main

Thanks for the reply guix I appreciate it. I have tested the transistors across all heatsinks to the best of my ability. I get fairly consistent readings across all of the Transistors except the 5 on the largest/longest heatsink closest to the Y-Buffer connectors.

These all read 50~100 when measured from the back and just get the squeal when I do my best to measure them from the top. I have not yet removed any from the board but will do so tomorrow if I have time unless I receive any other info beforehand.

Does anyone know...

Hi guys!

So recently we were watching a movie on our beloved Plasma when there was a pop/bang and the TV went out. I noticed a spark or some such emit from the upper back right of the TV (when viewed from the front).

After a little googling I suspected the Y-Main board had blown to which the Samsung Tech guy confirmed apparently. Since it is well out of warranty I'm hoping with the knowledge and experience of the good folks here I may be able to repair it myself.

I have some reasonable/basic Soldering skills, and I have a Multi-Meter on hand and believe...

Re: New Members - please post your introductions here

Good morning fellow Badcappers. I'm here for all the useful knowledge and wisdom being shared by the experienced members on this site. Have lurked on and off for many years and now here hoping to repair my own Plasma TV that Samsung don't want to know about!