The 7000U is South African, the 7000F is Carribean, 2 different geo locations. I would advise against the swap as there may be additional differences. They are also models from 2014 and 2018 so there are likely additional incompatabilities.
SOURCE: Samsung TV Power Supply Board
I doubt that moisture damaged the SMPS bd.
There are many circuit boards in your set and it will take a trained samsung tech to find the problem.
SOURCE: Samsung Power Supply Board
The power supply part number is BN44-00159A. You can also download the info from this link. It's the service manual.
SOURCE: Samsung HD 42inch TV Model No. PS42S5H Y Board
Your board numbers should start with LJ92. They will cross to both Samsung and LG. Oh, your model number goes nowhere, double check it.
SOURCE: Power Supply Board for SAMSUNG 40" LCD TV Model LA40R81BX
You'll find some Samsung power supply boards here : http://www.usefulparts.com/index.php?main_page=index&manufacturers_id=11&sort=20a&filter_id=98&alpha_filter_id=0
but you have to open your TV first and find out model number
SOURCE: Samsung power supply & IP board BN44-00264B &
For anyone else with this problem...I ended up getting a replacement transformer from ebay and swapping it out myself.
You have to remove the back panel of the TV, unplug the board from the harness going to it, unscrew the board (both via the set of screws going directly through the board and the set going through the plastic piece on the opposite side that, as far as I could tell, the board is glued to). This plastic piece (running the length of the board) has receptacles for the backlight bulbs, so be gentle getting it in and out. Don't forget the screw in the middle of the board.
De-soldering was a little tricky. My soldering skills are not great, so maybe it was me. But it certainly seemed to be a little challenging to get it all out. Having so many terminals probably didn't help (a capacitor would have been easier). Eventually though, I did get it out. Soldering in a new one was easy. Be sure to check continuity between the terminals of the new part and other parts of the board using the traces as a guide once you're done.
After that, simply re-install the board and put all hardware back in. Like I said before, be sure you re-engage the receptacles of all the backlight bulbs by pushing down at each notch on that plastic part of the board.
Hope this helps someone else...
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