A4000T won't boot

FromWithin · 27 February 2019, 20:50

I switched on my A4000T for the first time in about 8 years. It powers on, but remains on the black screen. Physically, there doesn't seem to be anything wrong. A4000Ts have a lithium button battery, which is not prone to leakage like the others. All the capacitors look fine; it all looks just like it should. Of course, I don't really know what I'm looking for. Maybe something has leaked, but I can't see any evidence of that.

First thing I did was take all of the extra boards out. No change. Then I took out the SIMM. No change. I tried switching from the 040 board to my PPC board, still a black screen.

I put the 040 back in and noticed that the power light flashes. It does 11 flashes, the last holds for longer than the others, like the following:

X.X.X.X.X.X.X.X.X.X.XXXX....[repeat]

Each flash is accompanied by a tiny click from the speaker.

This only occurs with the 040 board in-place. With no CPU board or with no PPC board, there is a black screen but no flashing.

Does anyone know what the flashing sequence means? Any thoughts?

lesta_smsc · 27 February 2019, 22:55

I recall seeing somewhere that this could be due to chip ram. Have a look to see if any are failing to warm up. I'm not sure if piggy back method can be used to bypass this?

A faulty Angus can also do this on other Amigas although I think it usually shows green screen.

FromWithin · 28 February 2019, 13:58

When you say "warm up", what exactly do you mean?

lesta_smsc · 28 February 2019, 17:40

Literally put your finger on the chips to see if they heat up. Usually takes less than 1 min. Too hot could also point to faulty chip as well as cold chip. Just a crude way to test... you can get an idea of faulty one if others in same group appear 'different'

FromWithin · 01 March 2019, 20:37

There doesn't seem to be any heating up on any of the chips.

Wrangler · 01 March 2019, 20:50

Check the ROMs are seated properly. I've had similar symptoms in an A3000 and it turned out the ROMs were slightly unseated.

grelbfarlk · 02 March 2019, 00:58

I've seen similar behavior when SCSI is not set up properly, either no or incorrect termination or some other misconfiguration.

27 February 2019, 20:50	#1
FromWithin Music lord Join Date: Jun 2003 Location: Liverpool, UK Age: 50 Posts: 630	A4000T won't boot I switched on my A4000T for the first time in about 8 years. It powers on, but remains on the black screen. Physically, there doesn't seem to be anything wrong. A4000Ts have a lithium button battery, which is not prone to leakage like the others. All the capacitors look fine; it all looks just like it should. Of course, I don't really know what I'm looking for. Maybe something has leaked, but I can't see any evidence of that. First thing I did was take all of the extra boards out. No change. Then I took out the SIMM. No change. I tried switching from the 040 board to my PPC board, still a black screen. I put the 040 back in and noticed that the power light flashes. It does 11 flashes, the last holds for longer than the others, like the following: X.X.X.X.X.X.X.X.X.X.XXXX....[repeat] Each flash is accompanied by a tiny click from the speaker. This only occurs with the 040 board in-place. With no CPU board or with no PPC board, there is a black screen but no flashing. Does anyone know what the flashing sequence means? Any thoughts? Last edited by FromWithin; 27 February 2019 at 21:20.

28 February 2019, 13:58	#3
FromWithin Music lord Join Date: Jun 2003 Location: Liverpool, UK Age: 50 Posts: 630	When you say "warm up", what exactly do you mean? Last edited by FromWithin; 28 February 2019 at 14:28.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
A4000T won't boot with A4000T ROMs, but boots with A4000D ROMs	8bitbubsy	support.Hardware	15	29 March 2022 13:41
A4000T boot signals help needed	tbtorro	support.Hardware	13	13 February 2016 09:06
A1200 won't boot	jimmer78	support.Hardware	6	09 February 2012 14:58
A4000T WB disks and Manual + Boot floppy for OS 3.9 installation	Kristian95	request.Other	4	27 February 2008 17:37
a4000t boot floppy?	tin	support.Hardware	2	14 October 2004 20:03

27 February 2019, 22:55	#2
lesta_smsc Registered User Join Date: Feb 2012 Location: United Kingdom Posts: 3,173	I recall seeing somewhere that this could be due to chip ram. Have a look to see if any are failing to warm up. I'm not sure if piggy back method can be used to bypass this? A faulty Angus can also do this on other Amigas although I think it usually shows green screen.

28 February 2019, 17:40	#4
lesta_smsc Registered User Join Date: Feb 2012 Location: United Kingdom Posts: 3,173	Literally put your finger on the chips to see if they heat up. Usually takes less than 1 min. Too hot could also point to faulty chip as well as cold chip. Just a crude way to test... you can get an idea of faulty one if others in same group appear 'different'

01 March 2019, 20:37	#5
FromWithin Music lord Join Date: Jun 2003 Location: Liverpool, UK Age: 50 Posts: 630	There doesn't seem to be any heating up on any of the chips.

01 March 2019, 20:50	#6
Wrangler Registered User Join Date: Sep 2015 Location: London, UK Posts: 414	Check the ROMs are seated properly. I've had similar symptoms in an A3000 and it turned out the ROMs were slightly unseated.

02 March 2019, 00:58	#7
grelbfarlk Registered User Join Date: Dec 2015 Location: USA Posts: 2,902	I've seen similar behavior when SCSI is not set up properly, either no or incorrect termination or some other misconfiguration.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)