Hello,

A three year old Humax HDPVR-1000C has lately developed a problem of picture artefacts typical for bad/weak signal and it looks like there is something wrong with the tuners.

Signal strenght as shown by the pvr's internal diagnostic deteriorates in negative correlation with temperature rise: 10C equals roughly 10% drop in signal strenght.

Using a fan to cool down the tuner board (which houses the the twin tuner module) I noticed that the signal strenght recovered almost to the level it was just after turning on the pvr. There are five electrolytic...

Re: Advice needed regarding switching psu recap

Thanks for replies. The problem is that I'm located in Finland and there seems to be limited availability for low esr capacitors locally (could not find a source for Nichicon VZ series here).

I guess it's not feasible to use a ceramic capacitor for replacement?

I am going to recap a dvr PSU in order to extend its lifetime.

Among others there are three Samxon KM series 0.22uf 50V caps on the psu board and I have hard time finding suitable replacement for these. If I understand correctly these small capacitance caps are not stressed as much as the higer rated ones in a switching power supply and I wonder if replacing these is even necessary? Any advice will be greatly appreciated!