EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: xoom on July 17, 2023, 06:00:08 pm
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Hi Everyone,
Got one control panel to check where LCD is not working right.
When give power to it LCD like glitches and shows all columns and rows. But when fully initializes it just shows few columns.
Thought maybe its zebra strip or flex ribbon problem (it have both ribbon for columns and zebra for rows) Cleaned zebra strip but no difference.
When turning knob on board can see LCD changes. Checked Data lines and other control lines with scope and looks like good signals.
Here are photos when turning knob:
(https://i.imgur.com/741EBB0.jpg) (https://i.imgur.com/741EBB0.jpg)
(https://i.imgur.com/RaYIzZQ.jpg) (https://i.imgur.com/RaYIzZQ.jpg)
(https://i.imgur.com/QnBJAOA.jpg) (https://i.imgur.com/QnBJAOA.jpg)
Here are board photo:
(https://i.imgur.com/PUQ17w1.jpg) (https://i.imgur.com/PUQ17w1.jpg)
Can SRAM (LY62256SL-70LL) be the problem?
Any suggestions appreciated.
Thank you.