I have searched the archives but I can't find one quite like this.
As the set comes out of standby the backlight flashes briefly and then the set goes back into standby. I'm 99% certain it's the power supply because the set works fine if I power the backlight with an external 24V supply.
Looking at the supplies as the backlight flashes, the 24V dips to about 19V then recovers for a while before shutting down. The 3.3V & 5V run supplies seem to collapse as the backlight flashes - I asume this is what turns the backlight off and puts the set back into standby. Standby supplies are fine.
When I started trying to repair this set the usual FETs (Q813 & 814) were blown, so I replaced these and IC 830. I've also looked at which components are in several 'repair kits' for the board and checked these as best I can but found nothing wrong.
I'm trying to repair this TV (Sanyo CE37FD47) for a friend and as a challenge for me, but I've run out of talent.
BTW I had convinced myself it was the inverter board so I bought another one - no different.
Thanks
As the set comes out of standby the backlight flashes briefly and then the set goes back into standby. I'm 99% certain it's the power supply because the set works fine if I power the backlight with an external 24V supply.
Looking at the supplies as the backlight flashes, the 24V dips to about 19V then recovers for a while before shutting down. The 3.3V & 5V run supplies seem to collapse as the backlight flashes - I asume this is what turns the backlight off and puts the set back into standby. Standby supplies are fine.
When I started trying to repair this set the usual FETs (Q813 & 814) were blown, so I replaced these and IC 830. I've also looked at which components are in several 'repair kits' for the board and checked these as best I can but found nothing wrong.
I'm trying to repair this TV (Sanyo CE37FD47) for a friend and as a challenge for me, but I've run out of talent.
BTW I had convinced myself it was the inverter board so I bought another one - no different.
Thanks
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