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tx-42A400b

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downunder:

Well no, Shaun. Once an error has been detected and the CPU generates an error code, Panasonic TVs are locked down thereafter. 1 second to black after switch on is usually a backlight fault in most LED TVs.

So, you have standby-5V present at all times. What about Power-On and BL-On voltages ? You may in fact have a faulty A-board (Main).

t1412:
change the mainboard still the same i'll test the led thanks

Turnip:
Hi Shaun,

Leds don't always show as faulty. Had one with the 'one flash' where all four strings on the long side strip checked OK, even out of the set with 300 m/a up them (Strip got rather hot though, off the heatsink)

Answer was a new strip £40+ locally or £18 freepost from China if you don't mind the fortnight wait - Chris.

sinclairtv:
So has this set got sidelight or back lights.

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