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DSO 068 LCD screen garbled

Posted: Sun Jan 20, 2019 3:13 pm
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.

Re: DSO 068 LCD screen garbled

Posted: Mon Jan 21, 2019 4:58 pm
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.

Re: DSO 068 LCD screen garbled

Posted: Wed Jan 23, 2019 8:54 am
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 :(