TAKO. INTERNET SEIT 1996.
Olympus-OM

Re: [OM] Transient cam malady, next steps?

Subject: Re: [OM] Transient cam malady, next steps?
From: Wayne Shumaker <om3ti@xxxxxxxx>
Date: Sun, 20 Sep 2020 06:42:38 -0700
At 9/19/2020 10:41 PM, Moose wrote:
>On 9/19/2020 3:25 PM, Mike Gordon via olympus wrote:
>><<Mike, first let me offer my sympathy.  That is upsetting.  I would agree 
>>with you that it sounds like a hardware problem.  Let me ask a question.  Has 
>>it been sitting, unused, for quite a period of time?  What I am wondering 
>><<is whether or not your searching for a solution may have raised the 
>>temperature enough to expel some moisture that was causing the problem?
>>
>>Sat for a couple weeks--had tried Pro cap mode  low with CAF near Essex 
>>river-- wet black labs and sticks.  No images of artistic merit  but fun 
>>proof of concept. Moose prompted this activity as he determined Pro cap mode 
>>H works for PL 100-400 though "they" say it isn't supposed to work.
>>Anyway, charged the battery and powered up the beastie and the problem is 
>>back, sigh.
>
>If I have the narrative right, it happens when camera is cold, then clears as 
>it's been on a while? You mention it got better after lens mounted, but might 
>it have been a matter of time powered on, nothing to do with lens?
>
>If so, it's probably something like a cold solder joint, damp/corrosion in a 
>pressure connection or some such. If so, you can document that and take pix of 
>the progress, so repair folks have proof, and perhaps a hint of where to look.
>
>Does it also apply when viewing images on the card?
>
>I expect it's in the display prep circuit, as it applies to both EVF and LCD, 
>so I expect image review to be affected the same, but it never hurts to 
>carefully enumerate all symptoms. If it only affected display of in-camera 
>memory, but not SD card images, that would further isolate the problem, for 
>example.
>
>I've done a lot of electronic troubleshooting. Sometimes it has even worked.

Of course, Oly will not try to find the problem. They will just swap out the 
circuit boards until it works.

Were I worked once, we used to silk screen, place parts and bake boards. 
Sometimes parts would not get the right amount of solder paste and be 
intermittent. Such boards were usually removed during testing.

In Mike's case, something has gotten hot, or getting hot, and likely failing. I 
usually find something is shorting out to cause that.

Any chance there has been some moisture condensation?

WayneS

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