My LCD screen shows only 2 lines of blocks!

I am using Geeetech Prusa I3B, with LCD 2004 smart controller, and the printer has been working perfectly for a couple of months. Yesterday, when I was printing, the LCD suddenly showed only 2 lines of blocks!

At first, I thought it was just constrast issue, but after I adjusted it, the screen still not worked, I checked the connection of LCD for many times, and I can confirm the connection is fine. I can not find any other solution. Can somebody help me? Thank you in advance.

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mcb1 over 10 years ago

You could try depowering and repowering it.
Like most of these displays, there is no physical reset of the onboard chips, and if they get confused, they loose the plot.

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mcb1 over 10 years ago

You could try depowering and repowering it.
Like most of these displays, there is no physical reset of the onboard chips, and if they get confused, they loose the plot.

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Former Member over 10 years ago in reply to mcb1

After re-uploading the firmware for some times, it works again now!. I think maybe its is communication issue that cause the firmware was not completely upload to mainboard.
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