Help I.D. this diode

RealCheetahz

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Hi, this diode is bad on my sharp image 639DS-R monitor chassis, i cannot find any schematics for this chassis. I get no neck glow, i do have 120v ac at the B+ pot, and cpl of the resistors just before this diode, i believe this is where it starts to convert(not 100% sure on statement after comma). Board has its own iso. I can read some of diode and it says. 50 M TFK, i cannot read the other part.
I am still very new at repairing these chassis.
Thanks

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