sci.electronics.repair@googlegroups.com

Today's topics:

* home-brew Freon TF substitutes? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/f66a71610e41b61d?hl=en
* Asus N7600GS (red dots and lines) - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/f811f0a341e6e63e?hl=en

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TOPIC: home-brew Freon TF substitutes?
http://groups.google.com/group/sci.electronics.repair/t/f66a71610e41b61d?hl=en
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== 1 of 1 ==
Date: Thurs, Oct 27 2011 5:00 pm
From: gregz

Jim Yanik <jyanik@abuse.gov> wrote:
> "Arfa Daily" <arfa.daily@ntlworld.com> wrote in
> news:zL1qq.3343$cH4.2935@newsfe24.ams2:
>
>>
>>
>> "Jim Yanik" <jyanik@abuse.gov> wrote in message
>> news:Xns9F8A7A4D7B694jyaniklocalnetcom@216.168.3.44...
>>> "Arfa Daily" <arfa.daily@ntlworld.com> wrote in
>>> news:H4Jpq.2929$M61.1622@newsfe09.ams2:
>>>
>>>>
>>>>
>>>> "Jeff Layman" <JMLayman@invalid.invalid> wrote in message
>>>> news:j83vnf$cjh$2@news.albasani.net...
>>>>> On 24/10/2011 13:33, Nomen Nescio wrote:
>>>>>> I last saw this in the mid 1990s. I knew a warehouse that still
>>>>>> had some drums hidden away...
>>>>>> Bloody best cleaner ever. Although some liked Genklene,
>>>>>> now also banned.
>>>>>> There are some commercial spray cleaners that claim to be
>>>>>> almost as good. I would like something in bulk for dipping
>>>>>> computer boards. Isopropyl alchohol is suggested by some,
>>>>>> but has 9% water usually.
>>>>>
>>>>> Not sure where you are, but isopropyl alcohol is usually available
>>>>> 99.9% pure, with a negligible water content.
>>>>>
>>>>> --
>>>>>
>>>>> Jeff
>>>>
>>>> I'd go along with that. The stuff specified as 'electronics grade'
>>>> is typically at least 99.7% to get that rating
>>>>
>>>> Arfa
>>>>
>>>>
>>>
>>> the IPA commonly available at drug stores is usually 90-91%,I
>>> believe,at least in the US.
>>>
>>> --
>>> Jim Yanik
>>
>> Probably the same here, which is why you have to go to an electronic
>> parts supplier to get the electronics grade one
>>
>> Arfa
>>
>>
>
> I don't know if US parts suppliers even carry IPA in any percentage.
>
> besides,after you open your bottle of 99% IPA,it probably absorbs enough
> moisture from the air to drop it to 91%..... ;-)
>
> Hmm,IIRC,Everclear (grain alcohol from a liquor store) is 95% ethanol.
> I believe it's the highest % of alcohol lawfully sold for drinking
> purposes.

Probably similar to lab grade 95% higher grades cannot be drunk. They used
to use lab grade to spike the punch. Had some high purity isopropyl. By the
time the alcohol dries, there is water droplets on boards. Must be dried
with warm air.

99% turns to 100% water.

Greg

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TOPIC: Asus N7600GS (red dots and lines)
http://groups.google.com/group/sci.electronics.repair/t/f811f0a341e6e63e?hl=en
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== 1 of 1 ==
Date: Thurs, Oct 27 2011 8:37 pm
From: Franc Zabkar

On Wed, 26 Oct 2011 13:45:08 -0700 (PDT), Jack00 <SPal508596@aol.com>
put finger to keyboard and composed:

>I got this graphics card in my PC and the picture on the monitor
>displays red dots and lines and sometimes goes away but returns
>again. I had to disable the driver for this card as Windows XP wont
>boot in normal mode ie shows a black screen but in safe mode XP boots
>but with red spots and lines and the picture goes purple if you try to
>browse on the internet. Is there any tests I can do with a
>multimeter? Or maybe get hold of a circuit diagram?

Those symptoms are consistent with a fault in the card's RAM. By
switching to a different driver, you are accessing difference areas of
memory. Also, if you select a lower refresh rate, this may mitigate
any timing issue.

Did you check the fan and capacitors on the card?

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

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