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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the number of blinks.
Still, the described symptom of a Sony KD-34XBR960 would almost always point to an internal hardware issue.
Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?
Appreciate the additional in formation; very significant.
I have to ask:
The model KD-34XBR960 uses the DA-4 chassis where there is no commonly known 20 blink code. As such, further diagnosis then would be by process of elimination.
Are the output voltages of the power supply board present and consistent?
I am inclined to suggest a component level check including voltage checks as an approach to diagnosis.
Still, perhaps another member can provide a shortcut to address the 10% failure with non-corrective IC replacements.
The question would be re-opened as I would be opting out.
Good luck with the Sony.