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This is most likely a component failure in the power supply. The unit is 10 years old and a lot of components are prone to age failure from poor design back when it was built.
If it was running when the power outage happened, that may have "fried" the control panel.
She needs to have it checked by an appliance repair person to see if that is so.
God bless your efforts.
It sounds like it may have had a power surge. Was it plugged into a power strip, or straight into the outlet? If it was in the outlet, or if the power strip is old, it may not have been protected and you could have fried some of the internal components. Also, did you have an ethernet cable plugged into it? My Xbox got fried a few years ago because of a power surge through my router. If the internal components are broken, the only reliable place to send it, in my opinion at least, is Microsoft's own repair site.
When was the last time the backup battery was checked? The trouble indicator could mean a weak or non-working battery. If the system is 12 years old, the battery should be changed.
This TV might have been affected by the power outage even if it was not ON at that moment. There is a standby voltage still present even when OFF and connected to the AC line.
There might be different failures on this TV:
1. The power supply might be defective after the power outage.
2. The main board could also be defective since the power supplies for today's TVs are not well regulated and once the voltage getting to the power supply increases, the standby voltage voltage will also increase damaging voltage sensitive components like the microprocessor or memory circuitry.
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