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Barry and MrB, thank you,- you guy's rock! Wish I had your ability. I'm a reasonably practical man but electronics on the level of your understanding is another language to me. Thanks for your input, it sounds hopeful that a successful repair may be had.
When I bought the scope the seller said that the characters take about half an hour to appear after turning the scope on, and that it never fails him. I found they did appear after about three hours but they faded away again after only a short period of time (maybe 10 minutes). Every other time I've turned it on, with the exception of only the first time I plugged it into a 12v power pack, I've got nothing in the way of readable characters. I must've looked a sight on my hands and knees in the hallway after dark, with a magnifying glass trying to see what's meant to be on the screen. I could make out the rectangles the characters form in against the screens background, and I did manage to get the background to adjust in those 16 steps of brightness.
As mentioned earlier, when I plugged the scope into a 12v power pack the numerals came up immediately, and solid and easily readable. Only on that day though and not since. I like the sound of a dry solder joint! That sounds very easily sorted. I have hope! I'm now going to have a look at those Ebay lcd screens.
My thanks, and kind regards,
john
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