Samsung PSU BN44-00504A PD23A0T_CPN broken

[nomoresonys]

Maybe, you can do other fairly simple tests if you want, can test all the diodes and resistors on top of board, youtube is your friend for how to videos, being about 12 years old you may have a bad capacitor or two, there's a rough test you can do with the electrolytic caps, I do it with just a plain non-autoranging multimeter to get some idea of what they are doing, can put the meter on 20k ohm setting, test a known good cap to get an idea of what they should do, basically you want to see a gradual rise or fall on the meter, reverse probes and watch it go the other direction. This test isn't definitive and the cap can still be bad but if it doesn't even pass this test then you know to check the cap out more closely or just replace it if you have some on hand.

[shoe548]

Maybe, you can do other fairly simple tests if you want, can test all the diodes and resistors on top of board, youtube is your friend for how to videos, being about 12 years old you may have a bad capacitor or two, there's a rough test you can do with the electrolytic caps, I do it with just a plain non-autoranging multimeter to get some idea of what they are doing, can put the meter on 20k ohm setting, test a known good cap to get an idea of what they should do, basically you want to see a gradual rise or fall on the meter, reverse probes and watch it go the other direction. This test isn't definitive and the cap can still be bad but if it doesn't even pass this test then you know to check the cap out more closely or just replace it if you have some on hand.

Thanks, yeah my first thought was capacitors. I don't have a non autoranging multimeter annoyingly but have looked using the resistance setting and the electrolytics all seem consistent at least. I could look at just buying replacements for all of them and hoping for the best but a bit of a stab in the dark

[nomoresonys]

When someone has less than expected voltage at standby, it could be due to a weak/bad capacitor.

[nomoresonys]

Another simple test that can determine a bad/marginal capacitor, heat the electrolytic caps for a couple minutes with a hairdryer then try the tv, don't wait til it cools, try it while it's still hot, can recheck that 4 volts you have too, see if it changes.

[vinceroger69]

i have had a good look online and cant even find a schematic for this board plus i cant seem to find a replacement psu to buy at a resonable price in the uk. i would hope someone like rj etc can help talk you through fault finding your psu, budm helped me in the past but sadly hes not been on any of the forums lately.

[shoe548]

i have had a good look online and cant even find a schematic for this board plus i cant seem to find a replacement psu to buy at a resonable price in the uk. i would hope someone like rj etc can help talk you through fault finding your psu, budm helped me in the past but sadly hes not been on any of the forums lately.

Yeah I'm a bit gutted really, at this point I think I'll have to buy a new TV. Cant find a replacement board anywhere. I did try replacing all the electrolytic capacitors in the hope that it would be one of them but no avail, suspect it's likely the IC or something. Thank you everyone on here for your help though