Amiga defect!?

[selco]

Hello all,
I have a big problem...

My C=A4000T worked here for ages as webserver with MySql. No hard- or softwareupgrade for a long times. Everything was fine.

C=A4000T, Cyberstorm060, Toccata, Ariadne, Cybervision64

Then it suddenly died without any reason.

When I power on it now it dies not try to boot. The fans and the harddrives start spinning but that is all.

- The Screen is black.
- The power-LED does not change its brightness.
- There is no access to the disk-drive.
- There is no Early-Startup-Menu.

I checked the Powersupply and +-5V and +-12V are provided.
I replaced the CPU-board (Cyberstor060) with an Cyberstorm 060+PPC and even withn the original 68040/25 CPU-Board but same effect. Nothing happens.
I checked the two fuses F160 and F161 on the motherboard and they seem to be OK.
I checked the Voltage on the Kickstart-Roms (+5V on pin 30) and +-5V and +12V on the RGB-Connector and they are present. I removed the Kickstart-Roms and checked theit contents - its OK.
Mechanically the Roms are properly in theire sockets. The same applies for the CPU-board.
I removed all Cards (Ariadne, Cybervison and so on) and all harddrives but nothing changes. The power-LED still does not change its brightness when I turn on Power.

Does anybody have an idea what could have died here? Does anybody have a tip what other tests I could do?

Are there (readable) schematics available somewhere? Is there a service-instruction available on the net?

There must be a way to awake my Amiga again!

I am really unhappy at the momment!

regards selco, http://selco.da.ru

[selco]

Hello again,
thanx for your tips so far.

Let me summarize the current investigations:

* Connectors for P8 and P9 look perfect.
* Caps Lock is Off. By pressing Shift Lock you can turn On/Off the Caps Lock LED 12 times.
* Currently I have no Zorro-boards and no Harddisks in the system, just the pain nacked A4000T.
* The PowerLed does never flash, just permanant green.
* The CPU-board seats perfectly in the CPU slot.
* The Kickstart-roms seat perfectly in their slots, the roms itself are OK (I calculated the Checksum over the read-out-images)

I took an Voltmeter and an Oscilloscope and measured all values I am knowing:

* All voltages on the external connectors (Printer, serial, Keyboard, Joystick/mouse, Video) are correct.

* All voltages on the Zorro-slots are correct.

* All clocks (that I could find in my books) are present on the Zorroslots (7MHz, 3.5Mhz, 0.7 Mhz)

* Pressing the reset-button on the case is reflected on two pins of the Zorro-slots as it should be.

* Pins for BUSERR and RESET are in passive state on the Zorroslots

* There is NO clock on the external video-connector!


Does anybody know a description/pinout of the CPU-Slot? Can I measure voltages/clocks there?

Does anybody have a detailed description of the A3640, Cyberstorm 060 MK3 or Cyberstorm060/PPC that I can measure anything on the CPU-board?

Does anybody know/has any repair/service/test instructions for the A4000T?


best regards    http://selco.da.ru