Boot problems on modded a4000

[Cass]

- If I switch the machine on with floppy, keyboard and mouse - the cpu fan spins up, a black screen
comes to sight, the Caps Lock light works.

Try pressing a couple of times -for 5/10 secs- the Caps Lock, and notice if the light gets blocked on the on-off state (not changing/modifying its state by repetitive pressing).

What does the black screen that doesn't go away mean?

Why is there no video display when booting if there's no floppy installed?

What monitor do you have? A standard VGA goes "out of scan range" by default on turning on the AMiGA (until the devs/monitors get loaded).
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Gang bang public

[Cass]

I will try that when I get back home. Currently no internet access there. What does it mean if it gets blocked

That the system is really dead! You might notice certain system-locks when your mouse or everything on screen has freezed, BUT your TCP/IP stack may be functional (ping responce), and the Caps Lock blinks if you press it (typical when you have low mem, chip particularly).

Turning on the amiga with a black screen might be an early fault (can't do the system check  -the normal greys on screen, or the red/green/blue/yellow error codes- ).

-Check the CPU board (that is well seated on the CPU slot).

-Check the ROMS (if they're missing or burnt you get a black screen, same as above -CPU- ).
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MAGIC FLIGHT LAUNCH BOX

[Cass]

Yeap, it's dead!

Caps Lock blocked, no error-codes on boot (even the rom won't check itself), no "early startup menu".

Sorry I don't have a Warp-card (I had a standard A3640). Might be the RAM modules on the card?!. Check some info on this (if it can be started without ram: es. the CSPPC won't boot without 1 pair of simm at least!).

Suspects: (from the least serious damage)
-RAM
-ROM
-CPU card

(from the most highly probable order)
-CPU card (when not fitted well always gives a black non-responsive screen when you turn on the AMiGA).
-ROM (won't do the self-check procedure on boot)
-RAM (see the CSPPC example, I don't know for the Warp card)

The PSU might be also, but in low voltage you wouldn't  have the caps lock ligth blink even for once.
I think it's the 5V for the mobo power, the 12V for the HDs etc. You have nothing to lose if you check the power output with a tester (you said that it's not the original PSU...)
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MERCEDES-BENZ 280

[Cass]

What happens is that when I switch on my machine the power LED brightens up after about half a second, the CAPS
lock light works the way it should (no freeze after 10 events) and the floppy starts to tick after some time. If I then insert the
Workbench disk, Workbench loads from the disk. This means that the CPU card and the ROM are working.

Nice, it's perfectly working!

But - the machine still gives out just a black screen. I've got a video --> scart cable connected to the "RGB port". I've
tested the cable with another machine - so I am certain that it works.

Could have been the monitor definitions (devs:monitors/) to redirect the video-out to the card, but since you don't see any "early-startup-menu", that means you have an RGB out problem.

- Check the pins on the RGB-out plug (AMiGA)

- Check the plug on the mobo side, and the first electronic components between LISA and RGB-out plug (resistors, capacitors, motherboard traces).

If here was a custom chip fault, you could not boot and the CapsLock is blocked with no floppy ticks.
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IPAD GUIDES

[Cass]

Can I test resistors, motherboard traces and capacitors with a multimeter?

Well, a simple inspection firstly will do (note any strangely-blacked component, disrupted traces etc.)

As for the tester, any electronic component should be tested by itself not in a circuity. That means much work, done by a specialist....

A simple thing to do is to test only suspected faulty:

- resistors (should give infinite resistance if burnt), if inplace may give any value (altered by the circuity).

- capacitors (should give an infinite value in case they're faulty), if normal they peak a 0 Ohm resistance that increases to infinite in short time.

- mobo traces should give 0 Ohm values if tested between 2 direct points (not any resistor/capacitor/IC between the tester leads).


Check the RGB-out plug and its pins to the mobo first, and then move proximaly to the mobo components


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ASIAN PETITE