NVRAM Problems

[guest2484]

Hallo

Ich tryed eine nvram ersetzen, aber weiterhin Probleme. Ich tryed zurückgesetzt und alle, und nichts, wenn ich boot mit Jumper (ohne Erweiterungskarte) den Falken nur boot in schwarzen Bildschirm. Mit diesem sympthon, kann ich wissen, ist ein nvram Mühe. Ich ablöten wieder die Steckdose und noch einmal versuchen möchten, aber meine Frage ist, wissen alle genau pin Informationen der U64 für den Check Spuren in den Vorstand? Ich meine, überprüfen Sie mit einem Multimeter. Sorry für diese Erklärung aber ich weiß nicht Deutsch, und ich benutze einen Übersetzer von Englisch nach. De

thx für deine Zeit!

[Johannes]

Hi Enito,

sorry to hear that your Falcon does not reboot after changing NVRAM. I have no clue what can be wrong on your falcon, but there are a lot of NVRAM cracks out here. I am sure, somebody can help you out with that.

Johannes

[Atari060]

Hi Enito!

Best would be if you use a socket for the NVRAM, so exchange in the future is very simple!

I had  a black screen once after a NVRAM change. Removing the Chip and reinserting it helped. If you have the opportunity, try booting your falcon with a sm124 monitor attached!

Good luck!

[tuxie]

Hi,

at first check all soldering pads for cold soldering points resolder all pads.

Frage an Johannes, wieso ist denn der fred hierher verschoben worden?

[guest2484]

Hi, thx for reply first!!!,

trouble i dont have a sm154 monitor, only vga...

If i put again the expansion card, falcon boot but hour time not work, i tryed reset nvram with combination keys, and nothing, everytime i poweroff time is lost. And i think is a trouble of nvram, because if i boot without expansion card, and jumper put on, i get black screen. My question, what trace points i need to check with multimeter from U64 , for check if a sometrace broke or something? i can put again the socket, but this one is like 3rd time, and im sure i get the same trouble..

Thx , and sorry for my bad english too...

[guest2484]

btw , i forget to say, i use a socket of 24 pins put in on in the U64, with a dallas replacement chip, the DS12887...if any can give me a photo from back of board, speacially the area of chip U64, for see traces and look mine, because apprently someones of mine are broken

thx!

[guest2484]

Me again , hehe sorry for massive post, but i wanna really make it work this falcon. I attach here with links some photos of the stuff, the white you see is a marker for repair traces with this i repaired traces. My doubt is in the back of the board, The connection to one r24 i see this trace, but im doubt if exist a trace to the resistence R237 or only to r24. Thats what i need a photo of back, for compare this little doubt. Sorry for the photo of back, is a bit bad, but if you need more quality i can try to get another one...

THX a lot for your patience and time!


http://www.postimage.org/image.php?v=TsEWm6r
Front U86

http://www.postimage.org/image.php?v=PqiEC2J
Pen for repair traces

http://www.postimage.org/image.php?v=TsEWSxi
With chip

http://www.postimage.org/image.php?v=aV2xl70
back board

[Arthur]

Look your PM.

[guest2484]

Hi all,

finally is FIXED!!!!

With the great help of a guys from .de forums, Arthur and simbo from atari-forums.com, the nvram was fixed. Whats the trouble? is a bit hard to find but finally, was first one trace from U64/Pin13 RTCCS <-> U56/Pin75 was broken, i fixed, and the 5v of pin 1 and 24 was dead, i take 5v from a near chip, the u68/pin20, with this one i get the 5V again. I fixed too other trace, but was easy, because is little break. I attach the pictures in case if someone have some weird troubles of nvram like me. Now my next step, if you can help, is search cpx, xcontrol, etc in english, because this falcon was from a .de owner.

Thx for read this ...
greets

http://img291.imageshack.us/i/dsc00909v.jpg/
http://img43.imageshack.us/i/dsc00908jl.jpg/