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yup. most common problem of all time with this monitor, yet it comes up and gets posted
here over 100 to 1000 times and still no definitive answer on the one and only solution to
solve this... even the flowchart is unhelpful here. will the fix for this never be told???
OK so, my SCR is good, my IC701 and my replacement flyback is good as well (tested in my other good chassis). I'm stumped on where to go next. All the capacitors in the HV section checkout. Anyone else out there have this issue?
I've tested the exact same components as you have but went further and replaced all the 1w and greater resistors anyways. I'm also leaning towards I601. But I don't want to pull from my working chassis. Have you found a supply out there yet?
Found them at vetco
https://vetco.net/products/nte1751-ic-tv-scr-driver
https://vetco.net/products/nte1550-ic-tv-signal-processor
I've placed the order, but being that I'm in Canada it will arrive when it arrives. Will keep this thread updated.
It's still "in progress" but I've got to step away for a few days and thought I'd post an update for anyone who's following this repair.
Are you monitoring the B+???
to high will cause the HV P~P voltage to go to high.
if the meter means you were checking HV then its to high!
Its should be around 25KV.
Driver transformer should not be the issue here.
The flyback were an issue in the tv models and a common problem
but if your replacement is as good and the same part number.
I would confirm the B+ is not running to high at startup?
This thing has been kicking my butt... I've replaced the Caps, Flyback, HOT, transistor, and a couple burnt resistors.
Here's what it's doing now:
I have the exact same issue as you. HOT keeps blowing then F701 goes.
I've replaced the Flyback and all the caps on this monitor. Before F702 would blow after some arcing in the neck and picture would fluctuate on the screen. Replaced the flyback (it was cracked) with a new one from security. Now the HOT and F701 blows.
Thanks for looking at this with us ohmerone! I've seen some of your posts on other monitor threads.
The meter on the video is measuring B+, and it peaked around 90ish before the HOT failed.
Something seems to be oscillating, causing a humm/buzz. I was initially thinking it would be a diode/zener. I haven't found a bad diode yet, but I don't have a way to test the zener breakdown voltages, either.