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Author Topic: My new Amiga 4000T - work in progress  (Read 11056 times)

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Offline Hanzu

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Re: My new Amiga 4000T - work in progress
« Reply #29 from previous page: April 12, 2012, 12:22:09 PM »
I have officially quit Amiga repairs for others for reasons explained (in finnish) here: http://saku.bbs.fi/cgi-bin/discus/show.cgi?3/9250

But if I ever get my last foreign customers A4000 repaired I may take a look but promise me to get it out of my hand if it starts to last. I have bad habit to not give up easily. It would be wrong to delay that A4000 repair I took before quitting with another hard case.

The substance in your picture may be harmless process or flux marks that you still see on the solder side of new PC motherboards. It also looks like water stain that I see often in my real work. Either way clean it with isopropanol tipped cottonstick or what ever it is in english.
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A4000 CR Rev D "Lian-Li Towered"+CSPPC 060 66MHz+Mediator+XSurf100 with USB+ZorRAM 256MB+Radeon 9200 256MB etc., A4000 original Rev B+CSPPC 060 50MHz+PIV etc., A4000 Rev B mobo, A4000T mobo+CSPPC 060 50 MHz, A4000T mobo, CD32, several A1200s, 2xA600, A500 Plus, A2000 Rev 6.2, several A500s with one ACA500+, Falcon 030, 1040STe, 1040STFM, 2xSVI X'PRESS (one MSX2+ modded), several C64s, 2xC128, 2x128D, C64 Reloaded MK2 and a big game collection.
 

Offline Ami_GFX

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Re: My new Amiga 4000T - work in progress
« Reply #30 on: April 12, 2012, 03:54:49 PM »
Just something to look at. I had an A4000D a couple of months ago that had no video output. At first I thought it was the motherboard but it ended up being a bad power supply--specifially the +12 volt out was bad.

This is assuming the screen is totally blank. If it is black, the motherboard is probably good and the CPU card is not working. In the A4000D I'm referring to, I got the video to go from blank to black which told me the motherboard was ok by putting in a good power supply.
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A2500 owned since 1993 with A2630/DKB 2632, DKB Megachip, GVP EGS Spectrum, A2320 and GVP HC+8 on the inside and a DCTV on the outside. A4000D with CSPPC, Cybervision 64 and a Flicker Magic flicker fixer. A4000T Toaster Flyer & CSMKII. All systems completly retro and classic and mostly used to do geometic art as in my avatar.
 

Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #31 on: April 13, 2012, 08:57:54 AM »
I have measured the following from the PSU (with nothing connected to it):

+12v: 11.7v
+5v : 5.2v
-12v : -10.8v
-5v : -4.4v

The keyboards caps lock works couple of times but then it stops responding.
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Offline magnetic

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Re: My new Amiga 4000T - work in progress
« Reply #32 on: April 13, 2012, 09:17:14 AM »
Quote from: Amiga_CDTV;688306


The keyboards caps lock works couple of times but then it stops responding.


This has specific meaning.. either NO CPU card installed or BAD CPU.
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Offline Ami_GFX

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Re: My new Amiga 4000T - work in progress
« Reply #33 on: April 13, 2012, 03:20:04 PM »
Seconded. Black screen and caps lock going off after a few presses indicates no CPU or CPU not working. The motherboard is working. Remove the CPU and you will get the same results.
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A2500 owned since 1993 with A2630/DKB 2632, DKB Megachip, GVP EGS Spectrum, A2320 and GVP HC+8 on the inside and a DCTV on the outside. A4000D with CSPPC, Cybervision 64 and a Flicker Magic flicker fixer. A4000T Toaster Flyer & CSMKII. All systems completly retro and classic and mostly used to do geometic art as in my avatar.
 

Offline hese7

Re: My new Amiga 4000T - work in progress
« Reply #34 on: April 13, 2012, 05:08:45 PM »
You get the same effect if some of the customs chips on the motherboard are not functional.
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Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #35 on: August 30, 2012, 11:59:16 AM »
I am proud to announce that the machine is working again :)

A local Amiga-techy took the motherboard for inspection and fixed it (faulty U106, details to follow).

I have just set the machine up and as I write this, it's humming on the background. The original SCSI hard drives were still properly set (SCSI Ids and terminations) and both work; there is even a complete Workbench 3.1 installation and a lot of software! Some of them in german, though.

I also installed an Indivision AGA Mk.II and the machine is now connected to a 22" LCD monitor (thrue DVI-cable).

I will post more photos and longer story here later.

This is truly an awesome machine! Thanks for all your ideas.
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Amiga A1000, A1060 Sidecar, A500, CDTV, CD32, 1084S, A1200, A1200 Magic Pack from Petro, ex-custom-case A3000T (now a complete A3000T), repaired A4000T and looking for more :)
 

Offline gertsy

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Re: My new Amiga 4000T - work in progress
« Reply #36 on: August 30, 2012, 12:15:07 PM »
That is fantastic.  Well done for hanging in there.  You gotta be proud of that unit.

Well done again. I have to say I had a **** of a day today and I am actually smiling and happy for you.  Thanks for cheering a fellow Amigan up.
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Offline Firedawg

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Re: My new Amiga 4000T - work in progress
« Reply #37 on: August 30, 2012, 02:28:35 PM »
Another Miggy saved!!!  From a cosmetic angle, are you planning to retrobrite the case?

Mike

Sorry Amiga CDTV!  I guess the retrobrite question was posed several times ago.  I need to de-yellow some of my old cases, but need a guinea pig too.
« Last Edit: August 30, 2012, 08:30:08 PM by Firedawg »
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Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #38 on: August 30, 2012, 07:49:14 PM »
@gertsy: ;)

@Firedawg: I am interested in trying retrobrite. I have pretty nice enviroment to try it at work (a school) but I need to try it on something less valuable than the A4000T front, at first!

Some photos available here:
https://www.dropbox.com/sh/em0hrhtpazpkk0k/tPoKIZvLTo

I replaced the original AT- power supply with an ATX PSU (with an adapter from eBay). I also installed an Indivision Aga Mk.II (with dvi- output).

I found a working key for the lock on the front panel, and did some styling for it, see photos.

One of the two hard drives (old SCSI drives) is on it's way out (bad sectors, sometimes drops out completely), I'll try to backup it's files into the working one, if possible. I would like to keep some oldish SCSI- drive as the main HDD (but preferably just one, these two are quite noisy). If the current WB installation doesn't reveal any problems, I am happy to keep using it (rather than doing a re-install).
« Last Edit: August 30, 2012, 09:09:34 PM by Amiga_CDTV »
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Commodore KIM-1, PET-2001, CBM 8032, CBM 8050, CBM 8250LP, D9060, VIC-20, C64, C64c, 1541, 1541-II, 1571, 1581,
Amiga A1000, A1060 Sidecar, A500, CDTV, CD32, 1084S, A1200, A1200 Magic Pack from Petro, ex-custom-case A3000T (now a complete A3000T), repaired A4000T and looking for more :)
 

Offline danbeaver

Re: My new Amiga 4000T - work in progress
« Reply #39 on: August 30, 2012, 09:35:33 PM »
Quote from: Amiga_CDTV;705903
@gertsy: ;)
I replaced the original AT- power supply with an ATX PSU (with an adapter from eBay). I also installed an Indivision Aga Mk.II (with dvi- output).


Just as a side note, had you wanted to stay original with the A4000T, the case is an Enlight AT Case and you can still buy drive rails, and matching AT power supplies.  I've replaced 2 power supplies in my two A4000T's and everything hooks up fine with all the normal switches.  I've thought about transplanting one of mine into a more exotic AT tower case, but I love mine too much as is.
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