Author Topic: Accidentally used a 9v PSU on the 6128 plus, what's the damage?  (Read 5213 times)

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Offline TFM

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Everybody knows that Bielefeld doesn't exist, but since when has it moved to Ireland???

Bryce.


Look at the chips.  ;)
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Offline gerald

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I already found the auction for me, the one you linked Bryce has +12eur shipping cost to Greece...
KM41464AP-12 64Kx4bit MOS DRAM DIP 18 1PC | eBay


I removed all ram, powered on and I don't get any IC with high temps. The only one that gets slightly warm (maybe 18~20 degrees? one just feels a really slight warmth when touching it) is the large asic. The screen I get now is the following with rolling garbage:





I'd love to have some ram atm for testing - even with some patching but unfortunately I can't find any suitable. I am really curious whether the machine survived or not .

Have you checked the removed RAM 2 by 2 in the 1st bank socket (IC110 / IC111)?
With a bit of luck two of them are still OK and the plus only need the 1st bank to boot

Offline TFM

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At the Wiki I can't find a decent picture of the Plus PCB, only GX4000. Can somebody give a pointer? Just asking, because it may help here.  :)
TFM of FutureSoft
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Offline gerald

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At the Wiki I can't find a decent picture of the Plus PCB, only GX4000. Can somebody give a pointer? Just asking, because it may help here.  :)
what's wrong with these ?

Offline TFM

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what's wrong with these ?

They are perfect!!! I will add a link to the Plus page, so people can find it. Thanks Gerald!  :) :) :)


EDIT: Done.
« Last Edit: 21:34, 17 June 16 by TFM »
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Offline Bryce

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Look at the chips.  ;)

Oh yeah, didn't notice that before :)

Bryce.

Offline keropi

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Well, I hope it doesn't come to replacing the ASIC.... I have done some smaller pitch smd IC replacements in the past with my "good quality amateur equipment" (a 90eur weller soldering iron, quality flux, leaded solder - nothing special but nothing utterly crapish) but there were two important factors at play:
a. I could destroy the old IC (thus the pcb pads end up like nothing was ever soldered on them)
b. I had a brand new replacement IC


I am more than sure I can remove the old ASIC from my mobo and solder a replacement but I doubt I can successfully remove an ASIC from a donor board so that it won't have bent legs or heat damage with my current equipment. I do hope it doesn't come to this.


Atm all 4 ram ICs are removed and binned, sockets are soldered in their place and on Tuesday morning I will receive the loaner ram .
It is encouraging that with the dead ram onboard both the 74LS038s under it also became hot after a while but they test OK in my tester. The ASIC during that time didn't even come close to being hot so I do hope that the ram took all the stress... but there is no way of telling until the replacement ram arrives.


Oh the wait is killing me , like 9v on a 5v cpc  ;D ;D ;D

Offline Bryce

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The ASIC should be removed / soldered with hot air, not an iron. Get someone else to do it for you if it comes to that.

Bryce.

Offline dragon

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To the database, this guy fried the gx4000 with 11v in the 5v entrance.

Only ram and z80 die.

Repairing Console Amstrad GX4000 | nIGHTFALL Blog / RetroComputerMania.com

You probably maybe have lucky.

Offline keropi

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@Bryce
no guts no glory  :P


@dragon
good to have a little more hope, I got some Z80s here as well, they are the TOSHIBA ones though like TMPZ84C00AP-6 and TMPZ84C00AP-8




If the 6128+ ends up being fine I'll open a thread about scart cable / non-amstrad monitor connection. With the help of a good friend I realized that using a TTL Sync as RGB-enable voltage is a really dirty thing that leads to image deterioration (especially on lcd panels) and TTL-luma isn't that great either ...  maybe someone has delved deeper into this , especially the ttl-luma output....
« Last Edit: 23:59, 17 June 16 by keropi »

Offline Duke

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I think the z80 will be OK, when it can setup the crtc (screen shot).

Offline chinnyhill10

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To the database, this guy fried the gx4000 with 11v in the 5v entrance.



Really really common. Killed at least 2 of mine like that.
--
ChinnyVision - Reviews Of Classic Games Using Original Hardware
chinnyhill10 - YouTube

Offline Bryce

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@Bryce
no guts no glory  :P

...and no ASIC if you butcher it with an iron! :D

Bryce.

Offline dragon

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Really really common. Killed at least 2 of mine like that.

And the asic survive?.

Offline Duke

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Completely agree, use hot air as Bryce said, atleast to remove it. I would use hot air to put it back it on aswell, but you can get away with using an iron and plenty of flux :)

...and no ASIC if you butcher it with an iron! :D

Bryce.

Offline keropi

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well yeah, it's no brainer that you need a hot air station to remove a smd IC like the ASIC in order to trsansplant it afterwards.
I never said I could remove a working ASIC and then transplant it using only my soldering iron for both tasks, that would be quite impossible  :D 
« Last Edit: 14:30, 18 June 16 by keropi »

Offline Duke

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Good :)

Just replaced the ram on my cpc6128 that got 12V (grey screen of death) and it's fully working again. Only thing damaged was the RAM, hopefully you have same luck.
The RAM chips I got were V53C256P80L (41256) so just had gnd pin 1 (A8). This was regular CPC of course, not a plus.
« Last Edit: 17:09, 19 June 16 by Duke »

Offline TFM

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Didn't the guy who made the JustCPC once tell that he has an internet source for ASICs? Forgot his name, but can't hurt to get in touch with him - just in worst case scenario.
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Offline gerald

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Didn't the guy who made the JustCPC once tell that he has an internet source for ASICs? Forgot his name, but can't hurt to get in touch with him - just in worst case scenario.
Yes he (Piotr) said that he has a source. But that's all he said  ;D

Offline Bryce

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And he was probably talking about Dönberg too.

Bryce.

Offline dragon

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Should be more easy buy the rights to amstrad. Take the tapes from steve gane, and made a fpga that find one new.lol.

Offline keropi

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Time to update the topic, I just got the RAM ICs and gave the machine a quick test: it works fine  ;D








Luckily it was only the RAM that failed (don't know if it was only one or two all ICs, I just replaced them all) and it seems everything went back to normal.

Thank you all for your support, input and help!
« Last Edit: 12:57, 21 June 16 by keropi »

Offline robcfg

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Congratulations, lucky man!  8)

Offline 1024MAK

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Congratulations, lucky man!  8)
Yeah, what he ^ said  :laugh:

Mark

Looking forward to summer in Somerset :-)

Offline ||C|-|E||

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Congratulations! It seems that the electrolytic capacitors in that Plus have been replaced as well  :laugh: and there is an extra red wire next to the LED connector, and probably an ABBA switch too somewhere, right?  :D