A4000T 060 needs help..

[Vlabguy1]

I just posted two pictures of my A4000T ..that needs a bit of help.
Im the orig. owner of everything in the picture..but here is the problem..
Does not display image through my CV64 card..I did some tests and
found I was missing 12v from the serial port...mmmm...Could I be
missing this 12v from the Zorro Bus as well??  I know the CV64 works,
I installed the drivers correctly..so its not a software issue..
She does work in straight NTSC mode..

Any ideas??

Thanks
Rich

[rkauer]

Please, explain a bit better: you have image from composite/RGB port (silly question on an A4000)?

Do you measure the PSU voltages? With a multimeter, of course.... :-P

Not joking: Do you have image only if you set the mode to NTSC and no other modes runs? Reinstall (Windows way of correcting bugs) all the Worbench and the drivers thereafter....:-(

Sounds much for nothing? Then give your Amiga to me. I'll much happy in fix those issues myself... :-D  

[Vlabguy1]

Well..I did measure the PS..that is ok..I did reinstall all software..that is OK..
I get no output from Graphics card..I know that work as I tested in another
machine.  
It seems I am missing 12v at the Serial connector..which..Im sure that 12v
goes other places as well..like the Zorro bus??  

Yes I only get NTSC mode from the 4000T video module..not from the CV64

I know this is NOT a Workbench/CV64/ or a cybergraphics problem..

Perhaps I have some leaky or blown caps  somewhere on the mother board?

[X-ray]

Has the Cybervision ever worked in that setup? What I mean is, are these new problems?

[quenthal]

Does this happen with both your A4000Ts? Did you try the stuff from this thread?

[Vlabguy1]

Yes these are new problems...I have had this card in this computer only..for a very long time ..ie..when the CV64 first came out ..thats when I bought it and
installed it..

All was fine then one day..I started to have this problem..

[Vlabguy1]

the problem does not occur in my other 4000T or my 4000D..

[Framiga]

time to reseat/clean contacts/socket!

and check the presence of the 12V on the Zorro slots (look at the A4000 User Giude)

+12v = pin 10

[Vlabguy1]

Framiga wrote:
time to reseat/clean contacts/socket!

and check the presence of the 12V on the Zorro slots (look at the A4000 User Giude)

+12v = pin 10

Not sure which contacts / sockets you mean..I have pulled the VC64 card out and tried in all the zorro slots.and I did check the contacts..they are clean
as new..
However I will check the +12 on pin 10 for sure.  ..so..if for some reason..I dont have the +12v..then what..??
do I have a blown or leaking cap??

I know the PS is good..I tested it and I also just to double check used a new PS and still the same result..

[quenthal]

So..

1) CV64 works with your other Amigas
2) PSU is working fine in both 4000Ts (PSU checked & switching them with other A4kT doesn't help)
3) Software installation is not the problem (clean install tried, switching working environments between A4kTs (and with modifications instructed in that other thread with A4kD) doesn't help)
4) 12V line is missing in the suspicious A4kT mb (can be found in other one and in A4kD)

If you've tried it all, maybe it is then "simply" hw-problem with the motherboard (with 12V-line or other), somewhere between PSU-connector and zorro/serial.

Hopefully Amiga Repair France or amiga.serveftp.net can help - maybe you could email them about the symptoms&findings thus far and the possibility of fixing?

EDIT: you should try cleaning and re-seating everything on the mb as framiga suggested - this has helped me numerous times.

[Framiga]

i meant to say everything with a connector or a socket on the mobo.

SuperBuster, kickstart, quartz Zorro daughter board everything.

Obviously if you don't have the 12v on the Zorro bus, the fault is more difficult to catch. (sorry but i don't know your skills about electronic repairs/restoring)

[Vlabguy1]

I may have to do that..as it really is a HW issue vs a SW one...I for a fact Im missing +12v on the ext. serial connector..

Funny how it would go like that one day..it all works then nothing..

The Amiga Repair Center is a good place??  I mean I dont want to send my
MB..then not get it back..if you know what I mean..

[Framiga]

the best and reliable you can find around! :-)

Edit- take a look even at the 6 pins "Molex" power connector on the mobo (or better on the mobo close the connector to be 100% sure that the 12v is present)

[X-ray]

Definitely. I trusted them enough to send my mobo there, so don't worry about how they will treat your mobo. Just make sure you use a reliable postal method.

[Vlabguy1]

I

Framiga wrote:
Obviously if you don't have the 12v on the Zorro bus, the fault is more difficult to catch. (sorry but i don't know your skills about electronic repairs/restoring)

No worries..I got the skills..Im very comfortable working with circuit boards,  soldering etc.  and pretty handy with a multimeter..

I take it ..in chatting with everyone here..that this problem has not been seen or encountered before..or atleast by one who has read this post and the one I posted a while ago regarding this same problem.


I think I will see whats up with the 12V. on the Zorro bus..then next I will check the A/V module card , and I/O module card..for anything obvious..then will probably pop out the Mother Board..to do a close inspection of all chip and components..