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The problem most probably lies with the quality of the transformer construction. Nothing to do with the other parts changed.
There seems to be an electrical leak across the primary and secondary windings, or between primary winding and the metal core, through inadequate or faulty insulation...
desolder dip tweezer
Use a desoldering tool to remove solder in every pin hole until you can see through to the other side.
In this state use a flat blade screwdriver to alternately prise each end of the IC off the board. The force applied is enough to shear off the small amounts of solder...
IPA as an alcohol is not ionised, so it is not acidic or alkaline, and will not corrode tape heads or lenses.
as for commercial cd cleaning disks, yes that is the regular way for the majority. however as a tech minded user, like all readers here, i want to be very sure the lens is really clean...
iso propyl alcohol or rubbing alcohol is a commercial cleaning agent for tape heads and cd laser lenses. water does not remove grease although spirit does, but spirit is not sold for such purposes. ipa also dries fast.
for me i had some similiar problems but solved the instability by going over the entire pcb with a strong magnifier. if solder spots are found with a tell tale crevice in it, I would resolder them. now my monitor display is rock solid.
I think the method that allows assured cleaning of the lens will require some work to remove the equipment cover, until you can access the lens. Then swiping the lens using a cotton tip with some IPA will give the cleanest surface.
Hi, you are on an interesting topic. I think the 21" CRT model CMT2179 by Hitachi is good. I had it for over 10 years and it gave me brilliant pictures and great sound. It failed due to a 40 pin decoder chip and I did not want to incur the cost of repair. I replaced it with a HD ready LCD TV...
Study the remains with a magnifier and bright light. If there is a hollow then a piece of stout wire dipped in quick set epoxy and inserted into the hollow can be used to provide a mechanical grip on the part. If there is no hollow but just a solid stub, you can try to drill a small hole into...
The exposed part of the broken pin should be near the glass surface. Use a small file to file the pin end until smooth. This is possible as the softer glass will not resist the hard material of the file. Then use soldering to attach a wire of the same gauge as the pin. You can then put a blob of...
osciloscope trio manual
I changed the 2 diodes mentioned, one of which was found shorted. Now the scope works like new.
Thanks for the tip and the schematic, which I made a copy to put inside the scope in case of future trouble!
Regards.
cs1022
Hi,
I am new here. I was also trawling the net for answers to the same problem until I came upon this nice forum.
I fixed the problem on my 20 year old scope by soldering a spare resistor of 42Ω 3W rating in series with the CRT heater. The heater pins are on either side of the key at...
trio cs1022
I fixed the problem on my 20 year old scope by soldering a resistor of 42Ω in series with the CRT heater. The heater pins are on either side of the key at the CRT base. My idea to reduce the heater current worked to reduce the uncontrolled trace intensity, which I heard is a common...
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