15 May 2008, 21:03 | #1 |
Bawbag.
Join Date: Mar 2008
Location: Chicago, USA
Posts: 375
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My A4000 is slowly dying?
Hi,
Ive noticed that 20% of the time when my A4000 boots, the display can be a little bit garbled, with horizontal lines running down the screen. Shutting it down and restarting it solves this. Im 100% sure that it is not the monitor as I use the same monitor with my Mac Pro all the time and I have not seen this issue occur. Im wondering if this is a sign that my A4000 is slowly failing. Is there any diagnostics I can run to check this, or is there any way that this can be fixed short of getting a new motherboard? Thanks, Mark |
16 May 2008, 01:45 | #2 | |
I hate potatos and shirts
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Quote:
Those SMD caps (as the regular ones, too), have a lifetime of 15~20 years, top. Replace 'em and be happy again. |
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17 May 2008, 01:55 | #3 |
Bawbag.
Join Date: Mar 2008
Location: Chicago, USA
Posts: 375
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Heres an example of what Im seeing: Heres a "good" screen.
And heres an example of a bad screen I think the vertical banding is due to the converter that Im using, but the corruption of the text in the bad image i cant explain. Mark |
17 May 2008, 03:26 | #4 | |
I hate potatos and shirts
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Quote:
That misbehaving is explained by the near-the-end capacitors. When they heat a bit, they start to act like a "normal" one. But they aren't. Electrolytic capacitors dry as the years passing. That's why I told you to swap 'em ASAP. |
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21 May 2008, 16:13 | #5 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,921
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The banding is because your converter's output resolution is not the same as the TFTs native resolution.
The corruption looks like it's doing deinterlacing but has the fields in the wrong order. To solve the banding, get a converter that outputs the same resolution as is the TFTs native, to solve the corruption, try and power cycle the converter, perhaps it'll resync. |
21 May 2008, 16:46 | #6 |
Bawbag.
Join Date: Mar 2008
Location: Chicago, USA
Posts: 375
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An external scandoubler arrived at the beginning of this week - I suppose I could try that and see if htat fixes the problem.
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22 May 2008, 07:58 | #7 |
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Join Date: Jul 2003
Location: Helsinki / Finland
Age: 43
Posts: 9,921
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The banding problem probably won't go away, but the garbling problem should be solved.
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26 May 2008, 08:50 | #8 |
Bawbag.
Join Date: Mar 2008
Location: Chicago, USA
Posts: 375
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I fired up the A4000 tonight with the external scandoubler flicker fixer.
One thing I tried was checking the boot screen (insert disk prompt), by unplugging the HD cable. Repeated this about 10 times - no garbling / corruption problem was noticed. Spurred on by this I then tried just booting up to WB 3.1 using the WB 3.1 floppy. Again, repeated this about 10 times, no trouble found. Finally tried plugging back in the HD cable and booting up off the HD. Display came up fine first time. But when I rebooted, I saw the garbling / corruption issue. Im thinking at this time, its the OS on the HD, OS 3.9. Just to make sure, I rebooted a few more times to the WB 3.1 floppy and no troubles found. I cant explain why I see this kind of behaviour in OS 3.9 (I dont know enough about it), but Im beginning to think the best thing might be to wipe the drive and go back to something like WB classic... |
26 May 2008, 08:54 | #9 |
hastala vista winny vista
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is there a difference between the screenmode used by 3.9 and 3.1 floppy ?
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