PSR E453 Boot issue

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Hello All.
I'm new to this forum and I'm not sure this is the right forum to discuss about technical matters

I have E453 keyboard and it had some physical corrosion issue with main board and power board. so i did my full effort to re-solder and add jumper connection for corroded path. but still it is not booting. when i switch on it i only see LCD back light and display got all 6 Black squares. how i fix this issue
 

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