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原帖由: Border Technical Services ,

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I would also suspect the backlight circuit (just shine a torch on the display and check if you can see the lcd image) .  As already stated,  when applying heat to a board where the components are so close together, the chance of disturbing an unwanted component is extremely high and there is an equally high chance of effecting the backlight circuit.   When soldering Smd parts, I always use captan tape surrounding the component in question to reduce the chance of heat spreading to unwanted areas.

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