On 01/09/2016 17:30, newshound wrote:
Panasonic plasma, just under five years old, sounds to me like power
supply tripping out when switched on. Blown capacitors?

Amazon (quick response) say speak to Panasonic first.

Panasonic (slow response) say sounds like motherboard, needs to be
inspected and they give me the number of a service guy (but not been
able to get hold of them yet).

A fair amount of stuff on the web about how to diagnose boards, but
arguably obsolete technology so not worth spending much money.

Have a look on the youtube channel norcal715, he has done diagnostics on
lots of similar sets.

On balance better to whip the back off and poke around, rather than
getting a man in? I have some electronics experience, plus DVMs (and an
oscilloscope, for that matter).

Yup, checking on the outputs from voltage regulators and buck converters
is a good starting place. An ESR meter can also be handy for testing caps.


--
Cheers,

John.

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