Re: Panasonic 15th Gen 2012/13, intermittent not powering on or standy LED - power ou
Looking at this more closely... Vsus, Vda, +15Vc/+15Vs aren't powering up. These all get their signal to start from U207, the PSU micom. This in turn is given the signal to start from the A board CPU via Panel_Main_ON, which is not going high when the set is switched on. STB5V and F15V are both good, so I'm starting to think this isn't a PSU issue.
Next checks will be on the A Board for IC8704 - SUB5V, IC8705 - SUB3.3V, IC8101 - SUB1.5V and IC8100 - SUB1.2V. I don't think the main CPU will give the Panel_Main_ON signal unless all 4 of these are present and correct.
Fuses on the A Board, PA8704 and PA2000 are candidates for investigation too.
Looking at this more closely... Vsus, Vda, +15Vc/+15Vs aren't powering up. These all get their signal to start from U207, the PSU micom. This in turn is given the signal to start from the A board CPU via Panel_Main_ON, which is not going high when the set is switched on. STB5V and F15V are both good, so I'm starting to think this isn't a PSU issue.
Next checks will be on the A Board for IC8704 - SUB5V, IC8705 - SUB3.3V, IC8101 - SUB1.5V and IC8100 - SUB1.2V. I don't think the main CPU will give the Panel_Main_ON signal unless all 4 of these are present and correct.
Fuses on the A Board, PA8704 and PA2000 are candidates for investigation too.
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