DSO 068 LCD screen garbled

Anything about this unique oscilloscope DIY kit
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Monj3t
Posts: 2
Joined: Fri Jan 04, 2019 4:11 pm

DSO 068 LCD screen garbled

Post by Monj3t »

Right after boot up, the LCD screen looks weird (see picture below). I can see some reaction to button presses, and sometimes it is even readable. I checked all connecions between LCD and main board and resoldered them, but that didn't help. I measured all voltages as per the assembly guide, and found nothing wrong. I noticed that the distance betwen the LCD boeard and the main board is very small (just a few millimeters), and as a precaution I ground all soldering blobs with a dremel to make them as flat as possible. It is very difficult to inspect whether there is a short or not, but I'm prety sure there isn't one.
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jye1
Posts: 1227
Joined: Wed Feb 20, 2013 4:58 pm

Re: DSO 068 LCD screen garbled

Post by jye1 »

Can you post photos of the board (both sides) please? Connection is the major cause for this issue. Please also check the solder joints at the pre-soldered MCU.
Monj3t
Posts: 2
Joined: Fri Jan 04, 2019 4:11 pm

Re: DSO 068 LCD screen garbled

Post by Monj3t »

You were absolutely right about checking the MCU. There was a blob of solder shorting the connectors of the Atmega. You can see it clearly in the last two pictures. I removed the blob, but that did not change anything, unfortunately. I hope I didn't ruin anything :(
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