I was given this 46" RCA and found the main fuse was blown. Replaced the fuse and the picture is the correct width but the bottom is bowed upwards and the top bowed down. The convergence is also way off. I've never worked on one of these before. Is there something common? Any schmatics of these online? Thanks for any help.
Len
Len: Go to this discussion on Sci.electronics.repair re your problem.
Also, I have the service data on this Chassis if you need something from it.
Robert McPherson Louisville, KY
Don't worry about the chassis, don't adjust! The reason for fuse blown was is the convergence power supply that is blown. It is small board mounted on the black plastic panel. Held down by 1/4" hex bolts. Get that convergence power supply fixed. There are two types of this by the way. One use big black IC on Z shaped heatsink, other one is small U shaped heatsink. Both have different appoaches to repairing those two types.
Cheers, Wizard
Hello again,
I finally got a chance to work on this thing! The convergence power supply is not running (as Wizard said), it's the one with the STK730-130. I don't have the full schematic but I do have a photocopy of a diagram of the power supply from a training manual. Is it safe to try to run this with no load to make sure there is no heavy current draw from the convergence board, which I understand will shut down the suppy? I haven't found anything bad with my meter and I suspect the STK is not firing up. Thanks for the help, Len
You're welcome, Len.
Ok, replace the STK730-130 IC. Any STK730-040 and up will sub in.
And check the diodes on output side just in case, check small resistors on hot side.
Cheers, Wizard
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