Amiga doesnt boot - Page 2

landex · 09 February 2008, 16:28

Is there way to see if the rom socket is ok?

Jope · 09 February 2008, 16:41

Multimeter and schematics.. Trace the data and address lines to the cpu.

landex · 09 February 2008, 18:01

where cam i find the schematics?

Jope · 09 February 2008, 18:58

http://www.google.fi/search?hl=fi&q=...gle-haku&meta=

ag_woodward · 09 February 2008, 21:50

I dont think you need schematics, I suspect you have broken a dry joint on the ROM socket. Check and re-solder all connections on the ROM socket - giveaway is that you said if you press it, it will boot. Either faulty socket or bad connection to motherboard.

landex · 09 February 2008, 22:49

Quote:

Originally Posted by ag_woodward

I dont think you need schematics, I suspect you have broken a dry joint on the ROM socket. Check and re-solder all connections on the ROM socket - giveaway is that you said if you press it, it will boot. Either faulty socket or bad connection to motherboard.

yes at the beging it boot but not now........

Is it normal that rom pin 21=VCC if the amiga is off it makes short with GND ?
When its on it has normal 5V

Jope · 10 February 2008, 11:16

It probably has a decoupling cap in line..

I missed where you said pressing down makes it work, I agree with ag_woodward, take the motherboard and bottom RF shield apart and resolder the ROM socket.

landex · 10 February 2008, 14:17

Quote:

Originally Posted by Jope

It probably has a decoupling cap in line..

I missed where you said pressing down makes it work.

at the begining but not anymore.
OK I will resolder the rom socket.

landex · 10 February 2008, 14:38

Can it be the R6 under rom socket who is damage?

landex · 10 February 2008, 18:42

my board looks exactly like this:
http://www.amiga-hardware.com/downlo...0mb_rev5_1.jpg

The only change is that the my agnus its 90º rotate to the right

landex · 11 February 2008, 02:32

now its just the drive led who is always on, the capslock is ok, but still get black screen..
By the way, the soft-reset still works...

Jope · 11 February 2008, 09:40

Drive led always on = drive cable in the wrong way around or on the wrong pins?

A bit difficult to say what's wrong with the machine now. I don't have any schematics for the rev3, so I can't really say what relevance the resistor has either.

landex · 11 February 2008, 13:55

Quote:

Originally Posted by Jope

Drive led always on = drive cable in the wrong way around or on the wrong pins?

A bit difficult to say what's wrong with the machine now. I don't have any schematics for the rev3, so I can't really say what relevance the resistor has either.

I thing is not rev3, its rev5.1 like:
http://www.amiga-hardware.com/downlo...0mb_rev5_1.jpg

The only change is that the my agnus its 90º rotate to the right

I try floppy cable both ways. Anyway if it was only the cable it should appear the screen with the disk.

landex · 11 February 2008, 15:35

jope you were right it is rev3. its on the side of board

Jope · 11 February 2008, 15:42

AlexH, can you change that in amiga-hardware.com? It really is a rev3 board. The text is on the underside of the board, in the area that's under the floppy drive.

I also dug out my rev3, the Agnus socket isn't turned, the text on the chip is. Pin1 still points downwards and it is marked with silkscreen on the board.

By the way, mine has no resistor under the kickstart ROM.

landex · 11 February 2008, 15:45

thing its one of the 3 transistors near the keyborad pins.
one of them has short between 2 pins

landex · 11 February 2008, 21:58

ok... it really is rev3. and give up. I try everything

Jope · 12 February 2008, 08:08

:-(

I hope you can find a rev6 or newer if you're going to replace it.. I'm out of ideas really, apart from replacing every custom chip one by one.

landex · 12 February 2008, 19:10

Quote:

Originally Posted by Jope

:-(

I hope you can find a rev6 or newer if you're going to replace it.. I'm out of ideas really, apart from replacing every custom chip one by one.

I done that allready, and its the no changes.

I've to find another A500

landex · 23 February 2008, 13:48

Hi
its me again, i found some A500 Boards in ebay, Rev5 and Rev8.
What its better?

11 February 2008, 15:35	#34
landex Registered User Join Date: Nov 2007 Location: Portugal Posts: 59	jope you were right it is rev3. its on the side of board Last edited by landex; 11 February 2008 at 15:42.

11 February 2008, 15:42	#35
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	AlexH, can you change that in amiga-hardware.com? It really is a rev3 board. The text is on the underside of the board, in the area that's under the floppy drive. I also dug out my rev3, the Agnus socket isn't turned, the text on the chip is. Pin1 still points downwards and it is marked with silkscreen on the board. By the way, mine has no resistor under the kickstart ROM. Last edited by Jope; 11 February 2008 at 15:51.

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09 February 2008, 16:28	#21
landex Registered User Join Date: Nov 2007 Location: Portugal Posts: 59	Is there way to see if the rom socket is ok?

09 February 2008, 16:41	#22
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Multimeter and schematics.. Trace the data and address lines to the cpu.

09 February 2008, 18:01	#23
landex Registered User Join Date: Nov 2007 Location: Portugal Posts: 59	where cam i find the schematics?

09 February 2008, 18:58	#24
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	http://www.google.fi/search?hl=fi&q=...gle-haku&meta=

09 February 2008, 21:50	#25
ag_woodward Registered User Join Date: Jan 2007 Location: Accrington/Lancashire Posts: 26	I dont think you need schematics, I suspect you have broken a dry joint on the ROM socket. Check and re-solder all connections on the ROM socket - giveaway is that you said if you press it, it will boot. Either faulty socket or bad connection to motherboard.

10 February 2008, 11:16	#27
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	It probably has a decoupling cap in line.. I missed where you said pressing down makes it work, I agree with ag_woodward, take the motherboard and bottom RF shield apart and resolder the ROM socket.

10 February 2008, 14:38	#29
landex Registered User Join Date: Nov 2007 Location: Portugal Posts: 59	Can it be the R6 under rom socket who is damage?

10 February 2008, 18:42	#30
landex Registered User Join Date: Nov 2007 Location: Portugal Posts: 59	my board looks exactly like this: http://www.amiga-hardware.com/downlo...0mb_rev5_1.jpg The only change is that the my agnus its 90º rotate to the right

11 February 2008, 02:32	#31
landex Registered User Join Date: Nov 2007 Location: Portugal Posts: 59	now its just the drive led who is always on, the capslock is ok, but still get black screen.. By the way, the soft-reset still works...

11 February 2008, 09:40	#32
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Drive led always on = drive cable in the wrong way around or on the wrong pins? A bit difficult to say what's wrong with the machine now. I don't have any schematics for the rev3, so I can't really say what relevance the resistor has either.

11 February 2008, 15:45	#36
landex Registered User Join Date: Nov 2007 Location: Portugal Posts: 59	thing its one of the 3 transistors near the keyborad pins. one of them has short between 2 pins

11 February 2008, 21:58	#37
landex Registered User Join Date: Nov 2007 Location: Portugal Posts: 59	ok... it really is rev3. and give up. I try everything

12 February 2008, 08:08	#38
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	:-( I hope you can find a rev6 or newer if you're going to replace it.. I'm out of ideas really, apart from replacing every custom chip one by one.

23 February 2008, 13:48	#40
landex Registered User Join Date: Nov 2007 Location: Portugal Posts: 59	Hi its me again, i found some A500 Boards in ebay, Rev5 and Rev8. What its better?

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