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This is purely a DRY SOLDER JOINT on the mother board. The fault can be found our if you can use a good light and observation lens , use a good soldering station to redo the solder on drive IC's and power circuits.
Neer the center of the mother board you should find a tall heatsink with an IC mounted to it. This is the vertical output IC. Change the electrolytic capacitor closest too the IC. On my set it is C406, I cannot read the value without removing it, but it will likely be 47Mf or 100Mf @50v.
that would work if you want a costly bill. Try this before dishing out cash, the problem is the switch that tells the board to turn on and of is bad and a cheep quick fix is to open the back of your TV(#15) (unplugged of course)and remove the hex(#10) screws to the mother board look under TV tube and you will see the switch board,remove both hex screws(#10) and pull the switch board out,follow black cord to mother board and pull cord out of its port. know find the word KEY also #2 on the switch board, should be the red wire. cut this wire and be sure there isn't any bare wire showing at your cut, a piece of black tape will help this. reinstall the switch board and mother board and back of TV . you should be all good to go
I answered many of these questions over the last number of days. Which TV or device was this for? What was the fault that it had?
If you are talking about replaceing the complete mother board for a TV set, if the set is more than a few years old, I don't think it would be available. Most likely the cost would be about the same as buying a new TV set. Another thing to consider, if you were to replace a complete TV mother board, you would have to perform the complete factory set-up to match the display device (CRT for example), and match the other boards driving it.
It wouldn't be the entire convergence board, you more than likely have a bad convergence STK-IC. Replacing the IC will take a good bit of knowledge and training as far as electronic repair is concerned, plus a complete convergence set up. In other words, unless your certified, you need to contact a tech. The convergence set up alone has driven men to drink.....