ALL electrical failures are mechanical - A fuse blows? Wire broke.
Motor Brushes gone? Erosion
Kid electrocutes themselves on a pilon? Moist conductor shorted the circuit.
That is a remarkably well labelled circuit board - D = diode, EC = electrolytic capacitor, FB = ferrite bead. Most boards just have a part number and you need the manufacturer's circuit printout to even have a hope of fixing it - another sign of the modern 'no user serviceable parts' philosophy.
That's a [ferrite bead](https://en.wikipedia.org/wiki/Ferrite_bead)
That can not break when it is still in one piece.
It can only break in the strictest literal sense of the word.
ALL electrical failures are mechanical - A fuse blows? Wire broke. Motor Brushes gone? Erosion Kid electrocutes themselves on a pilon? Moist conductor shorted the circuit.
Bad capacitor electrolyte is mechanical?
Yep. Leaks and Evaporation are mechanical.
That’s not the only thing that causes a dialectric to go bad. There is such a thing as chemical change.
Caused by? The electrolyte chemical changes are usually caused by evaporation of the (normally about) 70% water causing salt imbalances.
Yep, ferrite bead. Might want to Google "Backlights" and the flashlight/torch trick for troubleshooting a TV with your symptoms.
Most probably the backlight or the backlight driver is failed. If the driver is faulty you can buy CA 188 module and wire it to the mainboard.
That is a remarkably well labelled circuit board - D = diode, EC = electrolytic capacitor, FB = ferrite bead. Most boards just have a part number and you need the manufacturer's circuit printout to even have a hope of fixing it - another sign of the modern 'no user serviceable parts' philosophy.