exxos's Atari, Amiga & retro forum

Just make sure that the power is off when you short the HT cap to ground, its quite a scary spark if you dont! lol

It could also just be a dry joint around the HT transformer, if it gets bounced in shipping, hairline cracks in the copper tracks around the same area can be an issue.

Is there any high voltage noise from the horizontal output

Tom

juz400 wrote: 26 Oct 2021 20:33 Just make sure that the power is off when you short the HT cap to ground, its quite a scary spark if you dont! lol

Yeah i already have an arc welder :D

juz400 wrote: 26 Oct 2021 20:33 It could also just be a dry joint around the HT transformer, if it gets bounced in shipping, hairline cracks in the copper tracks around the same area can be an issue.

It was working for a while then stopped. I actually collected this one in person so i think it wasnt a transportation issue.

Tomswork wrote: 26 Oct 2021 20:49 Is there any high voltage noise from the horizontal output

Tom

I've not opened it. I am still needing to make or preferably buy a discharge tool.

I have had to replace the flybacks on a variety of different monitors. I use a long screw driver with a lead attached to the shaft then insulated with heatshrink and electrical tape near the handle. Other lead end is a low ohm high watt resistor(arc reduction) and a alligator clip.

It is been a while since changing one in a 1084S, but if I remember correctly it is also worthwhile discharging the larger caps on the board with a resistor. I have had my fair share of heart shakers in my early years as a electrical / electronic technician, don't need a top-up. :roll:

As mentioned before, if the flyback is busted then the HOT will probably be near-on dead as well so changing both is good practice. :)

EDIT:
I always found tuning the screen and focus on the new flyback a more scary procedure then discharging the CRT, as the monitor is powered when tuning. :shock:

Maybe my rejuvenation post can come in handy as an inspiration: https://www.atari-forum.com/viewtopic.php?f=15&t=38417 :)

Here is another POV on the dangers of CRT maintenance / repair, a interesting read https://lowendmac.com/2007/the-truth-ab ... ck-danger/

Yeah i've had a few HV shocks over the years and my heart is fine. :)

I'd just like a premade tool rather than relying on my own handywork

I built me a discharge tool and removed the Anode cap without any drama. Just waiting for the replacement to arrive.

I dont have a replacement HOT on order so i guess i'm doing the flyback first.

Dismantled....

Finally got round to finishing this repair..