A4000D won't boot anymore

lopos2000 · 28 June 2005, 10:45

I need some advice.

Yesterday, my A4000D stopped working.

It just won't boot up anymore.
First, it booted up alright. Put a 3.5'' disk in to format and the Amiga just froze. After checking all internal and external connection, checking all IC, I measured the voltage on the power in plug in the Amiga.

- Orange 6.48V
- Red -17.20V
- Yellow 0V

Am I right to assume that my Power Supply has gone to heaven?
Please help.
TIA

alexh · 28 June 2005, 10:53

Sure looks like it

Code:

  +------+------+------+
  |Orange| Red  |Brown |   Power Good is a TTL output from the power supply,
  | +12V | -12V |PwrGd |   a logical high indicating a stable power supply.
  |------+------+------|
  |Yellow| Blue | Blue |
  | +5V  |Ground|Ground|
  +------+------+------+

http://wonkity.com/~wblock/a4000hard/-5vprob.html

lopos2000 · 28 June 2005, 10:58

That was a quick reply. Will check it out.
Thanks alexh

lopos2000 · 28 June 2005, 11:36

@Alexh
I think that it can't be the 7905CV -5v regulator. Because my PSU has the wrong or no ouputs.

Yellow 0V -> should be +5V
Red -17V -> should be -12V
Orange +6.48V -> should be +12V

kriz · 28 June 2005, 13:47

have you checked the battery ?

lopos2000 · 28 June 2005, 13:49

The battery was removed ages ago.

kriz · 28 June 2005, 13:54

smart, i still have one bleeding in mine ...

lopos2000 · 28 June 2005, 14:45

Just an update:
found a loose connection in the PSU. Blue -> Ground soldered it back on.
Voltage Ok? now on the PWR plug.
Orange -> +11.49V
Red -> -12.06V
Yellow -> 5.03V
Brown (PwrGd) -> 5.02V (High)

Meassured U198
Voltage In -> -12.02V
Voltage Out -> -4.92V

Voltage out seems to me a bit low. Shouldn't it be -5V?

Any ideas.

alexh · 28 June 2005, 14:45

I think that would be within tolerance.

Does it still not work?

lopos2000 · 28 June 2005, 14:56

No. It still doesn't work. Could it be my CPU board? I have the A3630 rev1.0 board with FPU.

baggy2 · 29 June 2005, 21:36

Im selling my A1200 power supply, any good?

lopos2000 · 29 June 2005, 23:06

Sorry. no good to me. I have three of them. Can't use them with an A4000D.
Thanks for the offer.

lopos2000 · 30 June 2005, 14:17

Update No. 2:
- this time the fuse has blown
What type of fuse is in the Power Supply (rating)? Is it a 13A or more?
Please help.
TIA

BippyM · 30 June 2005, 14:23

plugs are 3amp and I think inside has a 5amp.. though I could be wrong

lopos2000 · 30 June 2005, 14:27

Thanks bippym. It's not 3A or 5A. Just had a look at the fuse holder. It's says 4A H / 250V. So I assume it's a 4Amp fuse.

28 June 2005, 10:45	#1
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	A4000D won't boot anymore I need some advice. Yesterday, my A4000D stopped working. It just won't boot up anymore. First, it booted up alright. Put a 3.5'' disk in to format and the Amiga just froze. After checking all internal and external connection, checking all IC, I measured the voltage on the power in plug in the Amiga. - Orange 6.48V - Red -17.20V - Yellow 0V Am I right to assume that my Power Supply has gone to heaven? Please help. TIA

28 June 2005, 10:58	#3
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	That was a quick reply. Will check it out. Thanks alexh Last edited by lopos2000; 28 June 2005 at 11:31.

29 June 2005, 21:36	#11
baggy2 Registered User Join Date: Jun 2005 Location: England Posts: 11	If it helps, Im selling my A1200 power supply, any good?

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28 June 2005, 11:36	#4
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	@Alexh I think that it can't be the 7905CV -5v regulator. Because my PSU has the wrong or no ouputs. Yellow 0V -> should be +5V Red -17V -> should be -12V Orange +6.48V -> should be +12V

28 June 2005, 13:47	#5
kriz Junior Member Join Date: Sep 2001 Location: No(R)Way Age: 41 Posts: 3,201	have you checked the battery ?

28 June 2005, 13:49	#6
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	The battery was removed ages ago.

28 June 2005, 13:54	#7
kriz Junior Member Join Date: Sep 2001 Location: No(R)Way Age: 41 Posts: 3,201	smart, i still have one bleeding in mine ...

28 June 2005, 14:45	#8
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	Just an update: found a loose connection in the PSU. Blue -> Ground soldered it back on. Voltage Ok? now on the PWR plug. Orange -> +11.49V Red -> -12.06V Yellow -> 5.03V Brown (PwrGd) -> 5.02V (High) Meassured U198 Voltage In -> -12.02V Voltage Out -> -4.92V Voltage out seems to me a bit low. Shouldn't it be -5V? Any ideas.

28 June 2005, 14:45	#9
alexh Thalion Webshrine Join Date: Jan 2004 Location: Oxford Posts: 14,355	I think that would be within tolerance. Does it still not work?

28 June 2005, 14:56	#10
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	No. It still doesn't work. Could it be my CPU board? I have the A3630 rev1.0 board with FPU.

29 June 2005, 23:06	#12
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	Sorry. no good to me. I have three of them. Can't use them with an A4000D. Thanks for the offer.

30 June 2005, 14:17	#13
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	Update No. 2: - this time the fuse has blown What type of fuse is in the Power Supply (rating)? Is it a 13A or more? Please help. TIA

30 June 2005, 14:23	#14
BippyM Global Moderator Join Date: Nov 2001 Location: Derby, UK Age: 48 Posts: 9,355	plugs are 3amp and I think inside has a 5amp.. though I could be wrong

30 June 2005, 14:27	#15
lopos2000 Zone Friend Join Date: Apr 2005 Location: Cider is best In The West Posts: 1,238	Thanks bippym. It's not 3A or 5A. Just had a look at the fuse holder. It's says 4A H / 250V. So I assume it's a 4Amp fuse.

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