Motorola ts907 low hv

[Yamamaya42]

Originally Posted by timmy

I dont know half of what you guys know when it comes to these tvs but I don’t get why the voltage drops once they are plugged in. Can I test the selenium diode with a dvm.I have noticed that when the vertical is running you can usually here it at the yoke all my other color sets I was able to here it this one I don’t. So if the vertical is not running that maybe pulling down the b+ since there is a 385v on the primary side of the output transformer or maybe no running at the correct speed.well I know if the vertical quits then I have a horizontal line but maybe not running at correct speed.

I have said it, and so have many others, you need to get better equipment, because now, you are just going on assumptions, and as long as you are, you will keep going in circles no matter what you try to do.

You NEED a better DVM that can measure the current draw right after the main diodes, you need to know what the draw is with NO guessing. 580ma? more? less?

And as others have said, you need an o-scope.
is the ripple after L54 1.5v? more? less?

ALL OF THIS is important, And can't be done with what you have right now.