lit and non-lit led diode in small holes of pcb detail from dismantled cellphone

assembly backlight backlighting black board button cell cellphone cellular circle circuit closeup communication component connect copper design detail device diode dismantled dot electric electrical electronic electrotechnics electrotechnology emitting engineering equipment ewaste handphone handy hole illuminating industry inside internal keyboard keypad layer layout led light lighted lightening line macro maintenance mobile network nobody node pattern pcb phone pushbutton quality recycle repair scheme science semiconductor service shine small source spot switch technical technology telecommunications telephone white yellow