TX-42AS500B Single Flashing Red Light - Replaced Inverter Board But Still Not Working

My TV is displaying a single intermittent flashing red light. The picture can be seen very, very faintly for a few seconds when first switched on before it disappears. I read that this meant there was an issue with the inverter board. I bought a replacement part (TNPA5935) from eBay but it hasn't fixed the issue. So I'm guessing there is more to this than just the inverter board?

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