commodore 1084s Failed

[Hurrah Brother]

Hi all,

I know some may call it blasphemy here, been playing with my Atari XEGS and my new SIO2SD on my 1084s.

My 1084s has 2 din style monitor connectors at the back (marked itl RGB and fin RGB) plus RCAs and is labeled 1084S-P BSI

Switched on this morning, high pitched whine coming from the monitor, power indicator not coming on, screen shows no sign of life/light.

Any Ideas as to what is up?

Ta kindly in advance for any advice.

[Chain]

bin it a buy another one
cheapest and fastest solution

[Jope]

The PSU is broken. Don't know what breaks in them when they go like that, I have always just replaced the PSU from a parts monitor. :-)

[Hurrah Brother]

Ta for that.

If you'll excuse my anglo saxon, Bugger!

Not having a 'parts' monitor, and seeing some of the prices, looks like I may be migrating to scart +crt tv in the near future.

Need to think and try a couple of avenues first I think.

(eg email analogic to see if they can do repairs on that model, they are about 5 minutes walk away!)

[Jope]

Well it's mostly generic components in the PSU.. Take it to a TV repair shop and ask them to look at it?

Schematics should be available on the internet.

[musashi5150]

I had the whistle of death come from one of my 1084S so I "lost it" at work According to the BBOAH it's the flyback transformer... whatever that is

http://www.amiga-hardware.com/showha...cgi?HARDID=849

[Hurrah Brother]

Originally Posted by musashi5150

I had the whistle of death come from one of my 1084S

Oh, the fault has its own nick name!



I have already mentally worked out a price where repair will be uneconomical (price of a new scart CRT tv, and scart leads).

[rkauer]

Originally Posted by Hurrah Brother

Oh, the fault has its own nick name!



I have already mentally worked out a price where repair will be uneconomical (price of a new scart CRT tv, and scart leads).

A humble Phillips clone flyback plus the service more expensive than a new TV?

TVs are just OK to show Workbench screens, 1084S are sharper.

[Jope]

Originally Posted by musashi5150

I had the whistle of death come from one of my 1084S so I "lost it" at work According to the BBOAH it's the flyback transformer... whatever that is

http://www.amiga-hardware.com/showha...cgi?HARDID=849

Not always. You'll note that his power led didn't come on. IIRC when the flyback goes, you will get a power led..

Anyway, both faults are fixable if you really want.

[TheCorfiot]

The High pitched whistle is produced by the power supplies chopper transformer being heavily overloaded. The PSU is still alive hence the whistle, If no whistle then PSU at fault.

The Overloading can be down to a Short circuited Line Output Transistor (whcich drives the flyback transformer - Line OutPut Transformer) or that the LOPT itself has developed a shortcircuit hence the overload.
Both these symptoms are indeed very common.

Test your Transistor first for short circuit if it's OK then the culprit is the LOPT...

Have repaired so many TV's monitors over the years & 1084's did tend to be the LOPT most of the time

TC

@rkauer

Replacing a flyback is quite easy but the time involved in setting the "screen" voltage then having to rebias the tube drives as well as the white balance is a real pain in the arse my friend. Flyback transformers tend to have too wide a tolerence for them to be plug and play.

[Toni Wilen]

Test with powersupply disconnected? Still whining (with possibly some random lamp as a dummy load) = borken supply

[TheCorfiot]

Originally Posted by Toni Wilen

Test with powersupply disconnected? Still whining (with possibly some random lamp as a dummy load) = borken supply

Exactly what I used to use, 60W Household bulb is perfect

TC

[PWLM]

Sounds maybe like the picture tube itself is gone, I had one go like this years ago and that was what a Miggy technician told me. I believed him because he was wearing a white lab coat...

[rkauer]

@PWLM:

[Toni Wilen]

Originally Posted by PWLM

Sounds maybe like the picture tube itself is gone, I had one go like this years ago and that was what a Miggy technician told me. I believed him because he was wearing a white lab coat...

I am not so sure

CRT fault very rarely damage support electronics (=short in gun elements or leak in tube are the only possible causes). Usually they only get dimmer and dimmer and blurrier..

[TheCorfiot]

Or they Arc internally.

[rkauer]

Or someone hack the tube gorge, making air enter in it.

Usually this make the tube implode.

[Hurrah Brother]

Originally Posted by rkauer

A humble Phillips clone flyback plus the service more expensive than a new TV?

TVs are just OK to show Workbench screens, 1084S are sharper.

This is what thought process I am using.

Argos do what seems to be a suitable TV for about £60-70. Spending more on a repair/refurb could be a false economy as another component could fail shortly after (not being able to handle the new power supply, i've seen that happen before!).

I do have a small Sanyo but its an early 80's one (possibly older than the 1084) so AV input only. Not bad quality, but scart would be superior for picture quality/display.

I could likely pick up a suitable TV from freecycle for the price of a cab fair their and back (to collect it)

Oh, I can confirm analogic do not do repairs on monitors.