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Offline Sandman

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Re: My new Amiga 4000T - work in progress
« Reply #14 on: February 27, 2012, 07:44:47 PM »
I don't mean to hijack this thread in a different direction but it might be worth considering.......

I have a A4000T with similiar minor yellowing and I am thinking twice about retrobriting it.

1. I did the retrobrite process to my A4000D a little over a year ago and even though it is kept covered in a dark room when not being used, I have noticed a gradual yellowing coming back and it is not as white as when first done.  There is info about this issue over at English Amiga Board and a possible fix by spraying a clear-coat on after the retrobrite process but I am concerned that this will alter the 'original look' by adding a different sheen or texture.

2.  I have had a couple of bad experiences with retrobrite on A1200 cases.  If I didn't get the whole procedure and time exactly right I noticed blotchiness and 'blooming' which was noticeable.  If the same disaster happened to my A4000T case I would be beside myself with grief! :)

Opinions?..............
 

Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #15 on: March 01, 2012, 05:46:09 PM »
My A4000T is looking so yellow that any improvement (even slight) would look great. When I get to the Retrobrightning, I will try some other yellowed plastic first, don't want to mess up with the A4000T!

Cleaning the outside of the case improved the smelling issue greatly, the machine is now bearable to have in a work room. The power supply looks like being filled with dust (and smell) so opening and cleaning it will be in my to-do list next.

The CPU-card and a temporary keyboard (A2000/3000 -one) are on their way. I am still missing the AV module. I have sent a PM to mdivancic but haven't received any reply yet.
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Offline magnetic

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Re: My new Amiga 4000T - work in progress
« Reply #16 on: March 01, 2012, 09:09:10 PM »
Quote from: Sandman;681705

2.  I have had a couple of bad experiences with retrobrite on A1200 cases.  If I didn't get the whole procedure and time exactly right I noticed blotchiness and 'blooming' which was noticeable.  If the same disaster happened to my A4000T case I would be beside myself with grief! :)

Opinions?..............

Yeah the blotching occurs if you dont put even layers of a very light coat... you cant just slap the stuff on (not saying you did haha) My advice is to get a brush from a beuty supply shop they use for applying tint or color.. and use that


@ Amicdtv

Nice amiga. Great to see a 4000T with the faceplate intact. Those A/V modules are hard to come by..good luck
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Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #17 on: March 07, 2012, 10:36:26 AM »
Update: I have now a suitable keyboard, and a A3640 CPU-card (which I still don't know if it works or not, see here).

I still don't have that AV-module, should the machine boot without it? I just tried, but it won't start booting from a floppy drive. The caps lock key on keyboard lights up and down so there is at least some life.

EDIT: according to this it should boot without the AV-mod. Perhaps it's something with the SCSI? I don't have the HDDs in at the moment, so the termination might be set incorrectly? Still, I am afraid it's still the missing caps from the CPU-module... hmm. :nervous:
« Last Edit: March 07, 2012, 02:35:03 PM by Amiga_CDTV »
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Offline J-Golden

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Re: My new Amiga 4000T - work in progress
« Reply #18 on: March 07, 2012, 10:41:09 PM »
Quick side note, you mentioned that you ordered a Indivision AGA for your A1200 and were thinking of putting it in your A4000T.  DON'T TRY IT!!!!!  It wasn't made to fit in the A4000T and you could damage either by trying.

That said and done, there is an ongoing thread talking about your specific Accel. here

Good Luck!
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Offline hese7

Re: My new Amiga 4000T - work in progress
« Reply #19 on: March 10, 2012, 08:08:19 AM »
@Amiga_CDTV

You only need the disk module to boot.
Connect the SCSI cable to the terminator on the I/O module to stop scanning for SCSI drives and thus faster boot.
The J100, J104 jumpers are set to EXT?

Most likely the missing A3640 caps is the problem.
 

Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #20 on: March 10, 2012, 12:19:28 PM »
Quote from: J-Golden;682852
Quick side note, you mentioned that you ordered a Indivision AGA for your A1200 and were thinking of putting it in your A4000T.  DON'T TRY IT!!!!!  It wasn't made to fit in the A4000T and you could damage either by trying.

That said and done, there is an ongoing thread talking about your specific Accel. here

The one I ordered is actually Indivision AGA MkII and it specially mentions A4000T, would that be Ok?

The thread about the accel. is mine, didn't want to put it all into this thread.

I will start replacing the caps on the CPU card. Not a problem as such, I just don't like working with SMD parts due their miniature size... especially now as the soldering pads are damaged and I need to rewire them!

hese7: Thanks. Will check the jumpers, too.
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Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #21 on: March 22, 2012, 07:54:21 AM »
Not much progress....

I replaced the missing caps to the A3640 card, but the 4kT is still not booting. Now I even came across a A3630 card (guaranteed working) but that doesn't work, either. With the latter in, it still won't start booting from floppy. Caps lock can be toggled on and off couple of times but then it goes off. Keyboard reset doesn't seem to work.

I am still missing that AV-module, have tried PM'ing mdivancic several times but don't seem to get any reply.

:(
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Offline bbond007

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Re: My new Amiga 4000T - work in progress
« Reply #22 on: March 23, 2012, 12:55:07 AM »
Quote from: Amiga_CDTV;681411
2) for the display I have two options; to buy a new AV module (anyone?) or buy some flicker-fixer expansion card and use it's vga output? (Thus still missing audio, but at least getting forward).

Indivision 4000. scandoublers and flickerfixers boards sometimes don't work that well with the AGA palette or LCD monitors.
« Last Edit: March 23, 2012, 01:04:18 AM by bbond007 »
 

Offline Firedawg

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Re: My new Amiga 4000T - work in progress
« Reply #23 on: March 23, 2012, 12:16:18 PM »
I have some back up components (mobo, cpu, memory)for my A4000T which I have been planning on eBaying.  I may post them here on A.org before doing so.  Maybe there is something I have that you need to complete your rig.

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« Last Edit: March 23, 2012, 12:17:12 PM by Firedawg »
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Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #24 on: April 12, 2012, 08:51:51 AM »
I have now got the AV-module (thanks, mdivancic).

Unfortunately, the system still won't boot. I have a basic scan-doubler connected to the RGB-output and an LCD-monitor connected thrue VGA. When I power up the A4000, the screen goes on (there is signal coming) but the screen stays blank. No color changes, no flashes, nothing. On PAL mode (jumper on the motherboard) there is a small coloured line on the bottom of the screen (this is a very cheap scan-doubler, and should be normal).

What I think it's weird, is that the screen stays blank whether I have or don't have a CPU card installed. So it seems there is no boot system test going on?

I have tried re-seating the Kickstarts (haven't removed them, don't have an IC-puller at hand). All other jumpers look correctly set (I don't have any RAM at the sockets at the moment, does it matter how the SIMM size jumper is set then?).

I am kind of running out of ideas :confused:
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Offline hese7

Re: My new Amiga 4000T - work in progress
« Reply #25 on: April 12, 2012, 09:38:53 AM »
You don't need an IC puller for the Kickstarts, a flat-head screwdriver works fine.

Do you have spare oscillators (50 MHz, 28.375160 MHz) to try out?
 

Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #26 on: April 12, 2012, 10:52:53 AM »
I was thinkin of pulling the Kickstarts with a flat-headed screwdriver, but I don't have one small enough for the job, at the moment. I will get one with me tomorrow. Also I think I'll grab my voltmeter and check the PSU voltages.

I don't have any spare oscillators.

There is one component (Y180) that has slightly hand-made looking soldering, see pic attached. Also there is a slight mark of heat on the trimmer next to it. What is the function of the trimmer (VC180)?

Btw: I was looking at the Y154 oscillator (28.375... Mhz). Is it supposed to be soldered in? Mine can be pulled off without difficulty. The Y104 doesn't come off.
« Last Edit: April 12, 2012, 10:55:03 AM by Amiga_CDTV »
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Offline Hanzu

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Re: My new Amiga 4000T - work in progress
« Reply #27 on: April 12, 2012, 11:59:42 AM »
Don't know about A4000T I just pulled oscillators for3 motherboards and it is this way:

  • A4000cr Rev D U104 not socketed, but U154 socketed.
  • A4000 Rev B U104 and U154 socketed.
  • A4000 Rev B U104 and U154 socketed.


So since Rev D is closer to age of your A4000T, I thing manufacturer decided to not socket 50MHz oscillator anymore to reduce costs and/or because of users were more tempted to experiment with overclocking and breaking something.

None of my 3 Y176 and VC190 are touched by soldering iron and I see no reason why that part should be hand assembled and hand soldered for A4000T.

More on VC190 http://amiga.serveftp.net/RTCrepair.html

I think no A4000 needs those clock circuit parts to be able to boot. Correct me if I'm wrong.
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Offline Amiga_CDTVTopic starter

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Re: My new Amiga 4000T - work in progress
« Reply #28 on: April 12, 2012, 12:10:31 PM »
I just removed the motherboard from the case. There was some strange marks on the board (about just under the other dodgy looking parts). Again I don't have too much tools to clean the board now (at work) but will try tomorrow with tools and cleaning stuff.

Hanzu: I had a look on your website. Do you have any interest to have a look on my 4kT motherboard? I am running out of ideas what to try next.
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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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