CM8833-II Just died

[juz400]

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.

[Tomswork]

Is there any high voltage noise from the horizontal output

Tom

[terriblefire]

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

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.

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.

[Danoo]

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:

[mikro]

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

[Danoo]

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

[terriblefire]

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

[terriblefire]

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.

[terriblefire]

Dismantled....

IMG_5568.jpeg

[terriblefire]

Finally got round to finishing this repair..

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