Amiga 2000 HY 200 vidiot breakage

[jess74]

Hi all new to this forum,
Well this is my story,today i wanted to add a second floopy drive that i just purchased for my A2000.All was going well,almost finished just needed to reassemble the casing that holds the power supply,and floopy drives.

Ok powered on both floopy drives start up cool,then the video out put on the monitor is yellow.Workbench loads up,everything is just a blurr.

Next i removed the casing that holds the power supply and found that,i must have dropped the power supply casing into the video output chip(vidiot)and the chip has split right down the middle..

I know that these chips can be removed from A500's,is it easy to desolder and resolder.Also i wouldnt think these would available new.

Maybe there is a hake for this chip?

Or would any one have i non/working A500/A2000 who is in Australia.

Any suggestions would be great on replacing

[pandy71]

Originally Posted by jess74

Any suggestions would be great on replacing

Alternatively you can build own VIDIOT or based on schematics provided by Commodore or by replacing original schematics with circuit similar to http://www.reprise.com/host/circuits/r2r_converter.asp ; http://thebloughs.net/hobbies/electronics/r2r_ladder/ - however instead HCT, HC series should be used, resistors value should be around 1 - 2kohm max (lower value increase conversion speed) however also current must be higher - fast DAC's usually are current not voltage type.

http://www.amigawiki.org/doku.php?id...ice:schematics
Schematics for VIDIOT (functional replacement) - check one of A600 schematics - Denise section.

[jess74]

Hi Pandy71,
Thanks for the quick reply,and all the info on the Alternative.Building my own VIDIOT is beyond my basic understanding of circuit boards.

I think it may be easyer for me to desolder one from a Amiga 500 and resolder into my A2000.Just need to know if the VIDIOT from the A500 is compatible with the A2000.The pin outs are the same.
Thanks again

[Hewitson]

It is not hard to build one, sourcing a proper IC would obviously be a simpler and much nicer solution. If you find a replacament I'm happy to help if necessary, have professional equipment here.

[jess74]

Hi Hewitson,
I really just have very basic resolder skills,Is it possible to repalce the A2000 VIDIOT with one from a A500?.I also live in melbourne maybe not to far form you,i would be wrapped if i you could help me build or replace the VIDIOT for my A2000
Regards

[Hewitson]

I see no reason why the 500/2000 vidiots would be different, but I'd suggest asking someone who knows for certain.

Really don't have the time to build & test a replacement mate, but let me know if you are able to get another chip/motherboard.

[amiman99]

Originally Posted by jess74

Hi Hewitson,
I really just have very basic resolder skills,Is it possible to repalce the A2000 VIDIOT with one from a A500?.I also live in melbourne maybe not to far form you,i would be wrapped if i you could help me build or replace the VIDIOT for my A2000
Regards

Same thing happened to me, the chip was broken in half.
I was pretty lucky and had broken A500, so I desoldered the chip from A500 and installed it in A2000.
There has to be someone with a broken A500 who can salvage one for you.

[jess74]

I have quite a few A500 mainboards all working,and did also have a few non working,but i gave them away wish now i hadnt now.Just thinking if i should kill one A500 to replace the A2000 VIDIOT hum.Or just try to source a non working one and just hope the VIDIOT is ok?Also i just have a 25 watt soldering iron and no solder sucker for desoldering.let me know what you think
cheers

[jess74]

Hi amiman,wow what great bunch of Amiga users we have here!!!very helpfull
So it is confirmed swap from the A500 to A2000 VIDIOT Cool.
Yer need to source a dead A500 mainboard,maybe post in the market place?
Cheers everyone

[pandy71]

Originally Posted by jess74

Hi Pandy71,
Thanks for the quick reply,and all the info on the Alternative.Building my own VIDIOT is beyond my basic understanding of circuit boards.

I think it may be easyer for me to desolder one from a Amiga 500 and resolder into my A2000.Just need to know if the VIDIOT from the A500 is compatible with the A2000.The pin outs are the same.
Thanks again

They should be 100% compatible - A500 and A2000 use same video subsystem.

[jess74]

And get some real soldering gear,please advise what i will need to get the job done right

[Hewitson]

Definitely worth destroying an A500 to salvage an A2000. You could try to improve you skills by constructing a replacement for the 500.

You're never going to desolder that chip with a 25 watt iron. Good soldering iron is Hakko FX-888. I would not suggest removing a chip with this many pins with anything other than a good desoldering station. The cheapest one worth buying is the Hakko 808, certainly not worth buying for one repair.

[jess74]

Thanks Hewitson please advise me with the tools i will need.

Also my soldering skill is very basic,maybe i could practice on some other boards i have first,dont want to damage any traces.

Yer its 22 pins.

[amiman99]

Originally Posted by jess74

Thanks Hewitson please advise me with the tools i will need.

I have this Desoldering Iron, works great http://www.radioshack.com/product/in...ductId=2062731
Practice is always good.
Apply some liquid flux, depress the bulb, heat, wiggle the pin, release the bulb, solder should flow inside the Iron, then pump the bulb over a wet sponge or paper to get rid of the solder from inside.
Watch from 44min how to desolder the pins [ Show youtube player ]

[jess74]

Cheers for all the info and help with the VIDIOT chip.
Today i called around a friend who has all the soldering gear.Deslodered the A500 vidiot chip,was time consuming,but was removed with all the pins intact.Snipped the vidiot chip from the A2000 as we thought this would be the safest way,instead of removing the pins risking track damage.Resoldered the A500 vidiot chip into the A2000,powered up,booted to the workbench screen back no normal as if nothing ever happeded

Happy days

[Hewitson]

Glad to hear you got it repaired.

[amiman99]

Perfect!
I like it when another Amiga gets fixed!

[prowler]

Great stuff. Well done, Jess!

[jess74]

Yer the friend who repaired it also got some satisfaction out of seeing the old beast fire up properly.Also i was able to get his(off the topic)Commodore 64 going again as i had a spare sid and vic chip,so smiles all around