I have a 2465B in the process of being repaired. Mine displays all four channels, ch3 and ch4 display correctly but ch1 and ch2 distort as the vertical position is moved up and down. Square waves look fine until you watch them move!
All low voltage supplies look fine and looking here and elsewhere I guessed that U400 is the most likely culprit. A replacement is costing about half of the cost of the scope but I don't see an alternative. Everything else on the 2465 looks fine.
Roger
