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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: toca180 on April 04, 2006, 08:38:51 PM

Title: Is my 1200 dead?
Post by: toca180 on April 04, 2006, 08:38:51 PM

Hi

I have been trying to add a buffered IDE interface to my A1200 (see sig). I had it working fine then I started to tidy it up a bit. I rearranged the cabling and thought Id test it before I put the case back togeather. It didnt work, all I got was a black screen. So I disconnected the interface and tried it. Still got a black screen. Not even the floppy was clicking. I disconnected everything (keyboard, floppy drive, accelerator board, mouse, etc) and still get a black screen.

I have removed the shielding and tried it but still only get a black screen. When I touch the chipc after it has been on for about a minute they are all cold apart from the 020 processor on the 1200 which is a little too hot to touch comfortably.

What else could I try? Is my 1200 dead? :-(

Thanks
Robert

Title: Re: Is my 1200 dead?
Post by: toca180 on April 06, 2006, 10:20:24 AM

:bump:

Anyone?

Thanks
Robert

Title: Re: Is my 1200 dead?
Post by: orange on April 06, 2006, 10:32:14 AM

yes, it is.
you could modify your sig..  :egad:

now seriously, have you checked the voltages? esp +5V on chips. AFAIK, besides CPU, Alice should get hot too

Title: Re: Is my 1200 dead?
Post by: toca180 on April 07, 2006, 10:56:59 AM

Hi

Thanks for the reply. Does look like Ill have to modify it!

How would I go about checking the votages? I do have a multimeter, guess thats whats needed. Which one it Alice, btw?

Thanks
Robert

Title: Re: Is my 1200 dead?
Post by: orange on April 07, 2006, 02:35:19 PM

well if you're not skilled forget checking voltages, its too easy to short something.

BTW you can find custom chipset pinouts very easily, probably on aminet just search a little.
once you have the pinout, you should connect the red wire to "+5V" or Vcc pin and the black wire to GND. its a bit hard to count all those pins and also set the (digital?) multimeter to something like 20V DC

surprisingly, Alice is the chip labeled as .. "Alice"  ;-)
its left to CPU, skipping the missing one.

Title: Re: Is my 1200 dead?
Post by: toca180 on April 07, 2006, 03:06:30 PM

Hi

Thanks for the reply.
That dosent sound like the easiest thing to do. Ill have a look and see how easy it looks. Ill also check to see if Alice gets warm when the 1200 is powered on.

Thanks
Robert

Title: Re: Is my 1200 dead?
Post by: toca180 on April 07, 2006, 04:53:02 PM

Whats the chances that the rest of my hardware, that was attched at the time, still working? Accelerator, ide interface, 3.1 ROMs, harddrive? I only ask as I dont have another 1200 to test it all in.

Thanks
Robert

Title: Re: Is my 1200 dead?
Post by: toca180 on April 07, 2006, 07:03:14 PM

Hi

Ive had a look and I dont think that my skills with a multimeter are up to checking the voltages on the chips. Alice does get slightly warm, not as hot as the 020 but warmer than Gayle (that I think is cold).

Robert

Title: Re: Is my 1200 dead?
Post by: orange on April 07, 2006, 09:20:32 PM

why don't you check power supply voltages with multimer, it should be relatively easy.

HDD can be checked in PC esp. laptops.

to be safe: have you waited long enough after disconnecting HDD for bootup?

I'd say the accelerator has good chances.

which cables did you move?

Title: Re: Is my 1200 dead?
Post by: lurkist on April 07, 2006, 11:01:28 PM

Maybe a silly question, but which IDE interface did you try?  If Powerflyer, maybe you removed it ROMs and all resulting in a black screen.  
Is the Amiga to monitor/TV connection stable?

Title: Re: Is my 1200 dead?
Post by: Gav on April 08, 2006, 02:43:37 AM

What roms do you have aswell?Just 3.1 rom take ages to boot the machine if no hard drive is attached..

Title: Re: Is my 1200 dead?
Post by: toca180 on April 08, 2006, 11:46:53 AM

Hi

Thanks for all the replies.

It has 3.1 ROMs and Ive left it on for about 5 minutes without the HDD and still a black screen.

I did check the power supply (called a Power Box, PC PSU in a box like the Gloiath)  with my multimeter and it looks fine. Also it will power my A600.

I have tested the SCART cable to my TV with my A600 and it workd fine too.

As for which cables I moved, I swapped round the IDE cables. I had a short one connecting the IDE interface to the 1200 and a longer one connecting the interface to the HDD, and I just swapped them.

This is my IDE interface:

http://www.amiga-hardware.com/showhardware.cgi?HARDID=542

Thanks
Robert