17PW26-1 PFC output

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  • Clydeuk
    Senior Member
    • Jan 2012
    • 193
    #1

    17PW26-1 PFC output

    Hi.

    Quick question. Does anyone have a working one of these and could confirm for me the voltage on C819 when the set is running? I have a hunch that there is a problem in the PFC circuit as I am getting 375v here, where I would expect it should be closer to 400v. It's obviously working to some degree, the set does work, but the PSU makes a loud hissing noise when cold and the remote is not responsive until a few minutes after the set has warmed up. I have replaced all electrolytics on the PSU including C819 itself, also the PFC controller (FAN7529). Scoping the outputs shows a fair amount of noise present, which seems worst on the 12v output.

    I think I have more than one fault here, but would like initially to know if the PFC is working correctly or not.
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