17PW26-4 voltages for future reference

[tom66]

I had this Hitachi Vestel junk on my bench for too long, found my frankenpsu (17PW26-4 modified to work as 17PW25-4) and installed that... amazingly it worked! The Toshiba 32BV701B would work now and then, but it would intermittently fail to start from standby... this works every time and I can't find any switch-on transient on the 5V or 3.3V, like I had a problem with before... I'm guessing this main board is malleable to this modification but not all are.

Anyway for future reference:

ref - standby - run
C814 - 0.01V - 15.2V
C801 - 18.3V - 17.5V
C892 - 11.1V - 10.5V
C840 - 0.01V - 0.4V (filter capacitor for part of control loop)

Output on 24V: 24.4V

[vinceroger69]

Re: 17PW26-4 voltages for future reference

was it a easy mod to do? many parts required.

[tom66]

Re: 17PW26-4 voltages for future reference

Fairly complicated, few parts but quite involved; I did it months ago and didn't keep a reference. Main thing is the 17PW25-4 has a 5V,3A output continuously available, whereas the 17PW26-4 has a 5V standby @ 100mA and 5V run @ 3A. It also has 3.3V but this is not needed. So the fix is to connect the 5V run and standby supplies together, and to give the 3.3V a little load, to help the 5V stay stable when starting.

[vinceroger69]

Re: 17PW26-4 voltages for future reference

well it works and its another set completed and kept out the land fill thats all what matters.