I've been away from this project for a while. It's a Philips Magnavox 25X601 00AA. In the meantime I checked virtually all the 400 series and 500 series components in the set, dealing with power supply. All electrolytics in those areas were replaced. All diodes and resistors checked OK, as did all transistor devices except for the following: IC410 STL30130 voltage regulator, Q420 NTE399 start up switch, Q501 NTE399 video output, Q502 NTE2353 HOT. All were replaced with the NTE numbers shown. In many cases I had to remove transistors and lift one leg of diodes to test them properly. It's been an instructive exercise in component checking (and going blind!)
I plugged all the cables back in and attached a swarm of DVM's to monitor voltages. With unit plugged in but not turned on:
Test point 10, expect 5V standby, actual 4.95V.
Pin 4 STL30130 output of voltage regulator, expect 16V, actual 15V.
Turned set on with remote control:
Test point 10, drops to 1.46V.
Pin 4 STL30130, expect 130V, actual 130.1.
HOT pin C, expect 127V, actual 129.5.
With set on: no raster, no sound, no HV.
Cannot turn set off with remote or with set button. Following troubleshooting procedure in Sams, I got OK as far as Q462 8V source, which should have pin E at 8.7V, actual 0.06V. It says to check that transistor, and it had already checked good out of circuit. After that I'm kind of lost. Would appreciate any suggestions (besides pitching this thing out! I know it makes no economic sense to keep at it, but I hate filling up landfills, and it has a good strong tube and has always made a good picture. I have several good working sets so don't "need" it. If I can fix it for a spare I'd like to.)