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| Re: C64 black screen / no screen at all problem [message #153951 is a reply to message #153941] |
Mon, 23 January 2006 15:14   |
Pasi Ojala
Messages: 151
Registered: March 2012
Karma: 0
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On 2006-01-23, XxXxX <XXXXXX@katamail.com> wrote:
> Hello. I tried to plug my old c64, the power led lits.
First check the fuse inside the machine. The LED is before the fuse,
thus it always lits if the power supply is at least partly okay.
-Pasi
--
/How long I could have wandered through Europe and Asia in this fashion I
do not know. For all my complaints about loneliness, I was used to it all.
And there were new cities as there were new victims, new languages, and
new music to hear./ -- Lestat in "The Vampire Lestat"
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| Re: C64 black screen / no screen at all problem [message #153992 is a reply to message #153951] |
Tue, 24 January 2006 04:58 |
Patryk 'Silver Dream
Messages: 737
Registered: July 2003
Karma: 0
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Pasi Ojala wrote:
> On 2006-01-23, XxXxX <XXXXXX@katamail.com> wrote:
>
>> Hello. I tried to plug my old c64, the power led lits.
>
>
> First check the fuse inside the machine. The LED is before the fuse,
> thus it always lits if the power supply is at least partly okay.
Depends on how "old" the 64 is. With the BN/E (later, narrow) board
revisions you can work even without the fuse, albeit without sound and
tape... ;-)
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| Re: C64 black screen / no screen at all problem [message #154003 is a reply to message #153941] |
Tue, 24 January 2006 09:32 |
Bill H
Messages: 92
Registered: June 2005
Karma: 0
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XxXxX wrote:
> Hello. I tried to plug my old c64, the power led lits. However I don't get a
> screen on the video. I don't get any screen really. Just all black. I tried
> to plug the tv cable to a scart adapter and nothing. So I soldered a cable
> based on this schematics
> (http://www.c64.priv.no/c64/files/docs_hw_avconnect.txt) to use the monitor
> port.. again plugged the video and audio jacks into the scart adapter and
> nothing appeared. Any clue?
You probably have already checked this, but is the monitor working?
Bill H www.ts1000.us
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| Re: C64 black screen / no screen at all problem [message #154034 is a reply to message #153996] |
Wed, 25 January 2006 03:54 |
Jurgen Haan
Messages: 179
Registered: April 2005
Karma: 0
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XxXxX wrote:
> The fuse is ok. And seems ok also the fuse in the power adapter. Do you know
> any poke I can write to generate a sound? (so that I can check if the
> machine is working). I don't have a disk drive nor a cassette recorder at
> the moment.
>
>
Well, you could try to set the volume, normally that would generate some
spike on the speakers or something.. try switching between poke
54296.0 and poke 54296,15 (you should hear a tick over the speakers) (at
least, I think these are the volume setting pokes.. has been over 10
years since I last used them)
-R-
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| Re: C64 black screen / no screen at all problem [message #154036 is a reply to message #154034] |
Wed, 25 January 2006 04:27 |
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Originally posted by: XxXxX
> Well, you could try to set the volume, normally that would generate some
> spike on the speakers or something.. try switching between poke 54296.0
> and poke 54296,15 (you should hear a tick over the speakers) (at least, I
> think these are the volume setting pokes.. has been over 10 years since I
> last used them)
tried. nothing happened
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| Re: C64 black screen / no screen at all problem [message #154104 is a reply to message #154036] |
Thu, 26 January 2006 02:54 |
ramswell
Messages: 1808
Registered: January 2012
Karma: 0
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Senior Member |
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In the unlikely event that you find that your SID CHIP is bad, feel
free to contact me regarding a suitable replacement. I have at least 4
on hand (that I have seen with my eyes that is) lolo..
Charles
8-Bit Designs
XxXxX wrote:
>> Well, you could try to set the volume, normally that would generate some
>> spike on the speakers or something.. try switching between poke 54296.0
>> and poke 54296,15 (you should hear a tick over the speakers) (at least, I
>> think these are the volume setting pokes.. has been over 10 years since I
>> last used them)
>
> tried. nothing happened
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| Re: C64 black screen / no screen at all problem [message #154105 is a reply to message #154036] |
Thu, 26 January 2006 02:58 |
ramswell
Messages: 1808
Registered: January 2012
Karma: 0
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Actually SCRATCH THAT! I just noticed that you mentioned that it HAS NO
SCREEN ON POWER UP!
DOH!
Try checking the memory chips, then the PLA (VERY LIKELY). Then if
nothing, then try the 901226 and 901227 (BASIS & KERNAL) chips. Then if
still nothing, then check the 8701 (CLOCK) and the 6567 (VIC). ONE HAS
TO BE THE PROBLEM!!
Whichever it is, I HAVE THEM ALL IN STOCK if you need them. :):):):)
Charles
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