Plus Screen Dead?

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Joined: Dec 20 2003
Posts: 36

My Mac Plus started smelling a little after I had booted it off a Rodime System "20 Plus" 20MB External SCSI Hard Drive. I turned off the Plus and the Hard Drive, and didn't touch them since.

I booted up my Plus the other day and I saw this on the screen:

[img]HOSTING DOWN[/img]
A movie of the Plus starting up WITHOUT the hard drive is available here. (1.1 MB, 13 secs). It does the same with or without the hard drive connected.

What do I do? Is it fixable? Right now it is imperitave that I get it working ASAP.

Best Regards,

iceBook

*EDIT: server down so can't upload*

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Joined: Dec 19 2003
Posts: 566
Re: Plus Screen Dead?

sjharcus wrote:

*EDIT: server down so can't upload*

why dont you upload it to your personal image gallery here :? ... click on the "create content" link in the sidebar ... then click "image" ... you can add the image to your post by using the "image manager" button

TOM

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Joined: Dec 20 2003
Posts: 36
I HATE this!!! I can't edit p

I HATE this!!! I can't edit previous posts.

I knew Drupal forums were bad but this really takes the biscuit ... in fact, it takes the whole damn tin!!

Plus Screen (Reduced 640x480)

See if this works ... hope it doesn't!

(probably won't now...)

-iceBook

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Dr. Webster's picture
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Joined: Dec 19 2003
Posts: 1687
The horizontal sweep on the t

The horizontal sweep on the tube is gone. Get a new tube and you should be fine.

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Joined: Apr 21 2004
Posts: 2
This is not the tube, but the

This is not the tube, but the powersupply. The Highvoltage is dead.
http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html#JailBar
See nr 3

-Ture

Eudimorphodon's picture
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Joined: Dec 21 2003
Posts: 1204
Re: The horizontal sweep

Dr. Webster wrote:

The horizontal sweep on the tube is gone. Get a new tube and you should be fine.

Uhm...

In CRT display systems isn't it the *yoke* that provides horizontal and vertical deflection of the electron beam?

(There are/were tubes that have built in electro-static deflection plates, but I'm reasonably sure that just about every computer monitor made in the last few decades uses magnetic deflection.)

It's more likely something in the horizontal sweep circuit on the analog board. Look here:

http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html

--Peace

(And what do you know... I was beaten to the URL! Never mind.) ;^>

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Joined: Dec 20 2003
Posts: 36
This sounds about right: [

This sounds about right:

http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html#FineVerticalLine

Covers what the problem is and how it is caused, but how do I fix it???

Best Regards,

iceBook

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Eudimorphodon's picture
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Posts: 1204
Re: This sounds about right: [

sjharcus wrote:

This sounds about right:

http://www.biwa.ne.jp/~shamada/fullmac/repairEng.html#FineVerticalLine

Covers what the problem is and how it is caused, but how do I fix it???

Follow the instructions on the website! ;^>

(It suggests several components that it's likely to be. I'd start by reflowing the solder around all the components in question, as there may just be a bad connection. However, the fact that you sensed a "burning" smell before it died suggests a component failure. Probably the resistor the page mentions.)

If you're not up to soldering then about all you can do is replace the analog board with a good one.

--Peace

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Posts: 566
Re: This sounds about right: [

Eudimorphodon wrote:

If you're not up to soldering then about all you can do is replace the analog board with a good one.

or you could just get a friend to do it ... you do have friends dont you Wink

TOM

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Joined: Dec 20 2003
Posts: 36
true, but what value is the c

true, but what value is the capacitor and how hard is it to get?

My Plus is already packed ready to go so I will do it when I get to Aberdeen ... what tools do I want, what sizes and where do I get them?

Best Regards,

iceBook

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Eudimorphodon's picture
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Re: true, but what value is the c

sjharcus wrote:

true, but what value is the capacitor and how hard is it to get?

The value should be printed on the old capacitor.

Quote:

My Plus is already packed ready to go so I will do it when I get to Aberdeen ... what tools do I want, what sizes and where do I get them?

It sounds like you may want to find someone with some experience to help you out.

There are *many* basic "how to solder" guides out there on the net. Entering "Soldering Tutorial" into google will get you a few pages worth, many of them including hints on assembling a basic tool kit, etc.

--Peace

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A standard solding pencil or

A standard solding pencil or soldering iron should be fine. Dont use a soldering gun. Get an iron with a pointed tip and dont heat the caps for too long...they blow up. (Someone was deafened by an expoding capacitor..)

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g3head's picture
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Re: A standard solding pencil or

martakz wrote:

A standard solding pencil or soldering iron should be fine. Dont use a soldering gun. Get an iron with a pointed tip and dont heat the caps for too long...they blow up. (Someone was deafened by an expoding capacitor..)

He'll burn though the board and start a fire before he blows a capacitor up with a soldering iron/gun. The only way I've been able to blow up a capicator with heat was with a heat gun, on high, pointed at it for a minute or so. And being deafened by its a little far fetched. Its now quite but it isn't much worse than cheap fireworks.