Re: Slightly Different Vestel 17PW26-4 Problem

Turned out to the PCF controller IC806. Pin 8 had a resistance of about 25 ohms to ground.
Spent a lot of time chasing red herrings as my board has many changes to the circuit diagram I found on the web.

Re: Slightly Different Vestel 17PW26-4 Problem

I think this is C878 (22nF 630V), which is in many of the repair kits. I was a bit suspicious of this one so I have already replaced it. My skill level isn't up to working out what this cap does but I'll check other components around this area.

Thanks

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...