Commodore 64 defect?

[mistermaniac]

An friend just contacted me about his old (But RETRO!!) Commodore 6
which emitted a lot of smoke when he turned it on. I got a picture o
the mainboard, which in my opinon not much good, looks like moisture
but i am not sure. Who can give an correct answer?

Greetings, MisterManiac

http://members.home.nl/mhemmelder/c64.jpg
Look in the direction of the CPU (6502)

 

[kip]

Somebody pissed on it.!!!?

 

[Andy]

Andy writes:

Once the smoke gets out, you need to trade it in
for a Sinclair.....

Andy in Eureka, Texas

 

[rb]

Junk
Buy another for $2.00 at a Rummage sale

 

[budgie]

An friend just contacted me about his old (But RETRO!!) Commodore 64
which emitted a lot of smoke when he turned it on. I got a picture of
the mainboard, which in my opinon not much good, looks like moisture,
but i am not sure. Who can give an correct answer?

If you're concerned about the ripples in the copper, don't be. That generation
of pcb's typically showed that result from heat buildup during the wave
soldering on the large blank copper areas. Normal design practice was/is to use
check-pattern or similar ground plane to avoid the heat buildup and copper
delamination.

Apart from that, I can't see anything in particular.

 

[Arfa Daily]

If you're concerned about the ripples in the copper, don't be. That
generation
of pcb's typically showed that result from heat buildup during the wave
soldering on the large blank copper areas. Normal design practice was/is
to use
check-pattern or similar ground plane to avoid the heat buildup and copper
delamination.

Apart from that, I can't see anything in particular.

I agree. I see no particular signs of moisture damage either. If it smoked,
where from ? Plug it back in, and see what smokes again, or just gets hot if
it's all outa smoke. Nothing to lose, as it's currently bolloxed anyway ...

Arfa

 

[K `Sleep]

Ebay often lists WORKING units for around $10.00 on average.
So why bother?

 

[Simon Scott]

An friend just contacted me about his old (But RETRO!!) Commodore 64
which emitted a lot of smoke when he turned it on. I got a picture of
the mainboard, which in my opinon not much good, looks like moisture,
but i am not sure. Who can give an correct answer?

Greetings, MisterManiac

http://members.home.nl/mhemmelder/c64.jpg
Look in the direction of the CPU (6502).

retro?

Shit, retro is 'in' right now. I better ebay all my old commodore gear!

 

[Jim Yanik]

I find that a surprise, as I once tried to open up a commodore power
supply .It was all one big brick of molten epoxy which was to all
intents and purposes inpenetrable, at least not without destroying the
innards (which i eventually did after hurling it at a wall in
frustration ;-)
-b.

"MOLTEN epoxy"??

Seems that would be fairly easy to penetrate.
The molten epoxy would be running out of the vents,too.

 

[b]

Jim Yanik ha escrito:

"MOLTEN epoxy"??

Seems that would be fairly easy to penetrate.
The molten epoxy would be running out of the vents,too.

aha! so you spotted the deliberate mistake then... ;-))

-b.

 

[mistermaniac]

"b" [email protected] wrote in


Fred McKenzie wrote:
An friend just contacted me about his old (But RETRO!!) Commodore
64which emitted a lot of smoke when he turned it on. I got a picture
ofthe mainboard, which in my opinon not much good, looks like
moisture,but i am not sure. Who can give an correct answer?

MisterManiac-

Back when they were new, the power module had the reputation that the
regulator transistors were held against their heat sink by the epoxy
potting. After some use, they separated from the heat sink, causing
either a failure or a thermal shut-down.

I never had that problem, perhaps because mine was a newer unit.
However some people became quite good at rebuilding the power
modules.

I find that a surprise, as I once tried to open up a commodore power
supply .It was all one big brick of molten epoxy which was to all
intents and purposes inpenetrable, at least not without destroyin
the
innards (which i eventually did after hurling it at a wall in
frustration ;-)
-b.



"MOLTEN epoxy"??

Seems that would be fairly easy to penetrate.
The molten epoxy would be running out of the vents,too.

--
Jim Yanik
jyanik
at
kua.net

What do ya know, the commodore has strangely enough, decided to wor
again, without any problem so far

 

[Jim Yanik]

Jim Yanik ha escrito:


aha! so you spotted the deliberate mistake then... ;-))

-b.

If it were "deliberate",then it would not be a "mistake"! ;-)

It would be an intentional error.

 

[Michael Kennedy]

AH! Yet again you caught his intentional error..

- Mike

 

[Ross Herbert]

What do ya know, the commodore has strangely enough, decided to work
again, without any problem so far.

Obviously then, it didn't emit smoke at all....

I was going to say that the fuse looks pretty healthy to me. While not
always the case, smoke emission may result in a blown fuse in the
power supply area.

 

[Michael Kennedy]

Obviously then, it didn't emit smoke at all....

Not necessarly... I once had a 5.25 floppy drive with an electrolytic cap
that the top burnt off of somehow and it still worked.

- Mike

 

[Michael Kennedy]

What do ya know, the commodore has strangely enough, decided to work
again, without any problem so far.

It didn't want you to throw it away.. ;-)

- Mike