Author Topic: CPC 6128 PLUS NO BOOTING  (Read 2409 times)

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Offline dimdim80

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CPC 6128 PLUS NO BOOTING
« on: 22:42, 10 November 16 »
Hello everybody,from a new cpcwiki user but a very old 8 bit fan.
I need your lights and advices desperately.
Here is the problem  :
I have bought a cpc 6128 plus with disc drive from ebay.
I received the item,it is the french model(azerty),and bought the parados cartridge for the french edition as well as a tv to scart cable and a psu adapter from ebay also.
I insert the cartridge in the slot and press the power button.The green light lightts on and it seems to be powered up correctly but when i press teh AV button from the tv it displays a blue border with an orange screen and nothing happens.(Attached photos).
PLease can you guide me as to what might be the cause?
The seller had listed this item as working in great condition and insists hat it works.
Thank you in advance i am expecting any advice.

Offline francouai

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Re: CPC 6128 PLUS NO BOOTING
« Reply #1 on: 22:54, 10 November 16 »
Dust on the cartridge slot or bad contact ?
In 1st, open your CPC and clean up inside.

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Online gerald

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Re: CPC 6128 PLUS NO BOOTING
« Reply #2 on: 22:58, 10 November 16 »
Two options:
- your Parados cartridge not working. ( Didn't you get the original basic one ?)
- One or more RAM chip is failing.

The second option is the most likely and replacement part are easily available (http://www.ebay.fr/itm/370592048270)
They can be replaced if you have required soldering skills.

Offline dimdim80

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Re: CPC 6128 PLUS NO BOOTING
« Reply #3 on: 23:28, 10 November 16 »
                        francouai : beep is not heard after i press the buttons.Also i have cleaned the slot and cartridge with some cotton swabs.
Gerarld: i could not find original locomotive basic cartridge.

Offline Dagger

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Re: CPC 6128 PLUS NO BOOTING
« Reply #4 on: 00:30, 11 November 16 »
Did you see a screen shot of it working before purchase? If not open a dispute as item not as described as these do not normally come cheap.
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Offline Ast

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Re: CPC 6128 PLUS NO BOOTING
« Reply #5 on: 11:28, 11 November 16 »

                       
Gerarld: i could not find original locomotive basic cartridge.


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Offline dimdim80

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Re: CPC 6128 PLUS NO BOOTING
« Reply #6 on: 20:43, 11 November 16 »
i do not wish to spend any more money.i have bought those rams you told me and await for them to test them.i have nearly spent 220-250 euros so far and i have no clue of this going to work.

Offline Audronic

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Re: CPC 6128 PLUS NO BOOTING
« Reply #7 on: 23:54, 11 November 16 »
@dimdim80
Put out a request to Borrow a standard Cartridge form some one in Greece.
Just to try and see if it works.
Also tell the forum the suburb where you live as  there may be somebody near by.
Good luck   Ray

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Offline dimdim80

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Re: CPC 6128 PLUS NO BOOTING
« Reply #8 on: 18:55, 12 November 16 »
Ok if someoe can help and lend me his cartridge...

Thessaloniki Greece ...if someone can help pls let me know and send full address.Thanks

Offline Bryce

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Re: CPC 6128 PLUS NO BOOTING
« Reply #9 on: 19:33, 12 November 16 »
I hate to be the one to bring bad news, but that looks like an ASIC failure, not a cartridge or RAM problem.

Bryce.

Offline Dr Tiger Ninestein

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Re: CPC 6128 PLUS NO BOOTING
« Reply #10 on: 10:57, 13 November 16 »
I would return it to the seller if I were you.

Offline dimdim80

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Re: CPC 6128 PLUS NO BOOTING
« Reply #11 on: 22:32, 14 November 16 »
if it is an asic problem is there any way to fix it?

Offline dragon

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Re: CPC 6128 PLUS NO BOOTING
« Reply #12 on: 22:38, 14 November 16 »
No, only subtitute the asic for other. But actually not exist spare parts. So the only is take a gx4000 asic donated. And it requite a very very very high solder/unsolder skills.

So in general asic dead=cpc dead forever.

This is the asic, imagine change it...

« Last Edit: 22:40, 14 November 16 by dragon »

Offline Bryce

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Re: CPC 6128 PLUS NO BOOTING
« Reply #13 on: 00:05, 15 November 16 »
Swapping it isn't a problem if you have experience swapping parts like this. Finding a replacement is the bigger challenge.

Bryce.

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Re: CPC 6128 PLUS NO BOOTING
« Reply #14 on: 12:28, 15 November 16 »
Probably a GX4000 would be the best option in terms of price... but it would be necessary to butcher it, and removing the ASIC also requires some decent skills  :-X .

Offline dimdim80

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Re: CPC 6128 PLUS NO BOOTING
« Reply #15 on: 20:13, 15 November 16 »
today i have opened it just to have a alook inside.i am attavhing a photo if that helps.definetely someonen has tried to modify it before since the screws from the kyboard are missing.
Is there anything bizzare in the picture?
Thank you for your help anyway .

Offline dimdim80

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Re: CPC 6128 PLUS NO BOOTING
« Reply #16 on: 20:37, 15 November 16 »
i have switched it on with the cover opened.i have noticed that the chips next to the disc drive,the ram chip after 10 secs are getting veryy hot.
I think i have read somewhere else in this forum in another thread that this means ram chip failure?
any advice or suggestions?
Thanks again so far your help is very valuable.

Online gerald

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Re: CPC 6128 PLUS NO BOOTING
« Reply #17 on: 21:29, 15 November 16 »
i have switched it on with the cover opened.i have noticed that the chips next to the disc drive,the ram chip after 10 secs are getting veryy hot.
I think i have read somewhere else in this forum in another thread that this means ram chip failure?
any advice or suggestions?
Thanks again so far your help is very valuable.
The usual sign of RAM failure is indeed the RAM IC getting very hot.

Offline dimdim80

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Re: CPC 6128 PLUS NO BOOTING
« Reply #18 on: 21:43, 15 November 16 »
I hope too.i have already ordered the ram you have suggested me and expecting to receive in the following week.So i will try them and let you know.Just to ask are these ram socketed?i mean how can i remove the old and place the new?

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Re: CPC 6128 PLUS NO BOOTING
« Reply #19 on: 21:56, 15 November 16 »
I hope too.i have already ordered the ram you have suggested me and expecting to receive in the following week.So i will try them and let you know.Just to ask are these ram socketed?i mean how can i remove the old and place the new?
There are no socket, you need to unsolder them.
A method applicable to dead chip is described there : http://www.cpcwiki.eu/index.php/IC_Repair
If you do not feel comfortable doing so, you better contact some local that can do it.

Offline Audronic

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Re: CPC 6128 PLUS NO BOOTING
« Reply #20 on: 23:37, 15 November 16 »
@dimdim80
Have you measured the Power supply Voltage with the unit powered up.
Just in case the power supply is unwell.
Good luck


Ray
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Re: CPC 6128 PLUS NO BOOTING
« Reply #21 on: 00:28, 16 November 16 »
If you need to remove the RAM, it is a good time to put some sockets in place :). In any case, the easiest way to remove the ICs is to carefully cut the pins and remove the chip itself first. Then, you can desolder the pins quite easily grabbing them with a pair of tweezers  :)

Offline Bryce

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Re: CPC 6128 PLUS NO BOOTING
« Reply #22 on: 10:18, 16 November 16 »
today i have opened it just to have a alook inside.i am attavhing a photo if that helps.definetely someonen has tried to modify it before since the screws from the kyboard are missing.
Is there anything bizzare in the picture?
Thank you for your help anyway .

The keyboard doesn't have any screws holding it down, it just sits there.

Bryce.

Offline dimdim80

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Re: CPC 6128 PLUS NO BOOTING
« Reply #23 on: 21:55, 24 December 16 »
I received the following ram UPD41464C-12  64Kx4bit MOS DRAM DIP 18  1PC
UPD41464C-12  64Kx4bit MOS DRAM DIP 18  1PC and took it to a local technician who installed it...
The problem with the orange border still remains as nothing has changed.
he told me that one ram chip was indeed problematic so we replaced it with the following UPD41464C-12  64Kx4bit MOS DRAM DIP 18  1PC
UPD41464C-12  64Kx4bit MOS DRAM DIP 18  1PC but the problem persists.
Could it be because the ram i bougt was 64 kb while the replaced ram was i think 16kb?

Offline Bryce

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Re: CPC 6128 PLUS NO BOOTING
« Reply #24 on: 16:15, 26 December 16 »
Can you post a link to the RAM that you think is 16K? How many of the four RAMs have now been replaced?

Bryce.