820-00928 no image on lcd

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THIS PAGE IS INCOMPLETE. THERE ARE MANY TROUBLESHOOTING STEPS TO ELIMINATE OTHER POSSIBLE ISSUES. THIS IS ONLY ONE POSSIBLE CAUSE OF NO IMAGE ON LCD.

Board boot with chime sound but nothing on internal lcd.

Disconnect lcd to force external display, image ok on external display.

Change MUX chip U9850 ( nxp 6142e ), all good.

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