Samsung Plasma pn50c550g1fxza clicking on power up

[dman535]

This is a 50" plasma that is not powering up. Upon plugging in all I get is clicking from a relay on the power supply board. If I unplug the X main board the unit gives the Samsung tones and appear to come on (minus the screen)

It is a common fault on these units or is it likely that other components have been taken out? Any diagnostic procedures?

[Damtom]

Re: Samsung Plasma pn50c550g1fxza clicking on power up

I have the same problem with PS50B430P2WXXU, clicking sound, power supply is bn44-00274b. research on net indicates bad capacitors on this power supply, I have changed around 11 capacitors which are very close to heat radiators but still no luck. I would be grateful for any other indication regarding issue

[rccrasher65]

Re: Samsung Plasma pn50c550g1fxza clicking on power up

Got an x-main if you need it!

[ReeceyBurger123]

Re: Samsung Plasma pn50c550g1fxza clicking on power up

Why make a thread, you diagnosed the bloody issue have confidence ! Also wouldn't hurt you to do some research on testing the Xmain but I wont start on that. But yes change Xmain no other questions.

[dman535]

Re: Samsung Plasma pn50c550g1fxza clicking on power up

Got an x-main if you need it!

PM sent.

[dman535]

Re: Samsung Plasma pn50c550g1fxza clicking on power up

Replaced X and Y boards. Unit seems to power up. Green led flashes on control board but I have no screen glow at all. The red LED on the front even seems to be having properly with remote inputs. I found a fast track on it - will go through an check voltages but was curious if anyone had a suggestion on where to start.

[ReeceyBurger123]

Re: Samsung Plasma pn50c550g1fxza clicking on power up

Start with Vsc on the Ysus, buffer can actually be damaged by bad Xmain if the Erc is chained like in this set. Test vsc then remove buffer and retest.

[dman535]

Re: Samsung Plasma pn50c550g1fxza clicking on power up

VS is 212 and VA is 55 according to the label. Those appear briefly when the set is powered up, then drop off. Which according to the fast track is correct for power supply testing.

VSC called for -187 and is currently showing -82. Same reading when the buffer is disconnected. The voltage seems to drop slowly as its measured,