84' Mitsubishi CS1984R - Startup Issue?

[zeno]

Thermistor is for degauss.
Most solid state sets bleed off HV fast so no clue there.
Find on/off relay, USUALLY black, rectangle, 4 pins, near the DGS
thermistor. Cant see in pix. Check it for bad cons.
Quick tests: Check DC at STR. The big resistor above it should
have 150v one side apx 130 on other.
Check hoz drive xformr primary abt 75V sec abt 0V.
Check hoz out, case ( collector) abt 130V
Get back with results...........

73 Zeno

[Mad-Mike]

Originally Posted by zeno

Thermistor is for degauss.
Most solid state sets bleed off HV fast so no clue there.
Find on/off relay, USUALLY black, rectangle, 4 pins, near the DGS
thermistor. Cant see in pix. Check it for bad cons.
Quick tests: Check DC at STR. The big resistor above it should
have 150v one side apx 130 on other.
Check hoz drive xformr primary abt 75V sec abt 0V.
Check hoz out, case ( collector) abt 130V
Get back with results...........

73 Zeno

I cannot do all the tests now, might need to wait a few weeks (busy with Wedding stuff). I picked up a more recent vintage Sony Trinitron to fill the Mitsubishi's role for the time being for $10.00. In two weeks or so, my fiancée is going to California for her wedding shower, giving me a weekend to really dig into this thing.

I picked up the Service Manual for it online today. I was quite shocked how much stuff on that set is under-used, I did not even know it had an internal clock on it until now (shows time on the OSD), I've been using/messing with this TV set since I was 6 years old.

I know at least one Relay inside the set is functional because when I power it on it has that audible "click" of a relay. Now that I have the service manual, I know which board is which. I pulled the sound PCB yesterday and checked around, might be the CRT PCB (the one above it) that might have something to do with what's wrong if it's inline with the main power source like the audio is.

I will let you all know when I get the results, as I tend to be a tad paranoid about working around HV when the set is on, I will be running temporary wires out of the case while testing. One thing I have noted is it seems the HV circuits are not even getting powered up, I've not heard one snap of current when discharging the anode cap, and I've been having some pretty close relationships with those HV area components (HOT, Flyback, Anode) looking for faults and all.

[Mad-Mike]

Originally Posted by zeno

Thermistor is for degauss.
Most solid state sets bleed off HV fast so no clue there.
Find on/off relay, USUALLY black, rectangle, 4 pins, near the DGS

It seems to not be there, might it be on one of the other boards. I do hear a relay click when the Set is powered up (the other sign of life besides the channel selector lighting up on whatever channel I choose).

Quick tests: Check DC at STR. The big resistor above it should
have 150v one side apx 130 on other.

I'm getting nowhere near the right number on these (0.1VDC)

Check hoz drive xformr primary abt 75V sec abt 0V.

How do I know which is which?

Check hoz out, case ( collector) abt 130V

0.54VDC

It seems the high voltage Circuit for the CRT is not getting enough voltage for some reason from early on in the chain. The fuses are all good, and the one confirmed Relay is switching (it's on the Sound PCB, which is also what the power cord goes into before anything is sent to a transformer).