Component level repairs are definitely possible in many cases - particularly when the issue is a bad electrolytic capacitor or a cracked solder joint - but requ

Component level repairs are definitely possible in many cases - particularly when the issue is a bad electrolytic capacitor or a cracked solder joint - but requires specific electronics experience, which many appliance technicians might not have. Replacing the board becomes a trade-off between more expensive labor vs more expensive parts. For smaller devices like cell phones it becomes much more difficult due to a combination of miniaturization, specialized parts not available on the general market, and secret schematics that can't easily be derived from the complex multilayer PCBs in use.