Quote:
Originally Posted by Electronic M
A broken HV connection will only reduce effective HV at the CRT....It should either roughly maintain load on the flyback (perhaps the most power hungry stage in the set) or reduce the load on the flyback. An unloaded fly consumes LESS power so the B+ should either be unaffected or INCREASE slightly (from reduced load) if the HV connection opens like that.....You do realize HV and B+ are two completely separate power sources in a TV right? The power transformer derived or rectified power line derived 150V to 475V B+ found in all tube TV receivers is considered LOW VOLTAGE in TV parlance. The 3KV to 50KV found on the second anode connection of the CRT (usually, but not always flyback derived) is called HV (High Voltage).
You still most likely still have a low B+ issue. If not, then....In most TVs there is also a roughly1000V B+ BOOST rail that is flyback derived (often from the damper in B&W sets, often from it's own diode in color sets).....The BOOST line usually feeds the vertical stage (sometimes CRT screen grid, and other things too).....So if the horizontal is out of whack bad enough to kill or reduce the boost it will affect the vertical, but usually not close to the degree that your screen shots show.
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Well I'm not sure if I tested in the right spot for it or not but I had tested the 300MFD 150 Volt power supply capacitor with the TV on to check the B+ voltage and what I got was 147 Volts or so which I'm not sure if that's correct or not because like I said I'm not even sure if that was the correct spot for testing B+ voltage or not but as far as voltage goes for the capacitor itself its still within specs yet (the capacitor in question is a 150 Volt capacitor and it measured 147 under load which is still within specs yet which means that the capacitor is apparently still good yet).