Does no backlight really mean logic board problem?
Recently damaged glass screen and LCD. Phone worked fine before attempting repair, just black spots where screen got damaged. After replacing both LCD and front glass all works but screen very dim and no backlight. Old damaged one now dim also. Have I done something to damage the backlight? If so what and can I fix it? Have read it's part of the logic board and impossible to fix. Is this true. Backlight was fine before disassembly.