samsung plasma ps51e550d1r no display

[Red_Springbok_Admin]

I have samsung plasma ps51e550d1r that powers on but doesn't display and the power light blinks 5 times, where to start looking ?

[dick_barton]

Re: samsung plasma ps51e550d1r no display

Photo's of the circuit boards and connections and also voltage readings giving the pin names and voltages on those pins

[Red_Springbok_Admin]

Re: samsung plasma ps51e550d1r no display

so we were checking the boards for visible signs of damaged components and shorts and we found a few components in the y board and eventually got all the ones replaced we could see and detect as faulty after 2 or 3 attempts . now the situation is when power is connected the logic board led blinks 5 times in 5 second intervals for 30 seconds and stops and power led starts to do a double blink after 30 sec continuously . we get the 5v standby in the logic board. no vs and va in the y board. when we disconnect the bottom middle cable leading to the logic board the logic board led stays off and the power led 5 times again like original error. what can we check or try next?

[Hamie]

Re: samsung plasma ps51e550d1r no display

The vs and va voltages will only show initially then will drop back to 0. Unhook the ysus and test vs and va right as you power on the tv

[Red_Springbok_Admin]

Re: samsung plasma ps51e550d1r no display

we disconnected the y board and tested the vs and va and we got the correct readings . next we check the components on the x buffer board and found three shorted components 2 transistors and a diode we replaced them and connected everything except the y buffer board and it lead to the three components on the x buffer board blowing again.
what could be the fault now?

[tvtimmy]

Re: samsung plasma ps51e550d1r no display

Always test the new parts before installing. There are so many fake transistors coming from China.

[Red_Springbok_Admin]

Re: samsung plasma ps51e550d1r no display

we used compatible components from spare boards we have.
whats the symptoms of a faulty screen?

[tvtimmy]

Re: samsung plasma ps51e550d1r no display

Hairline cracks on the edge of the screen. Very hard to see.

[Red_Springbok_Admin]

Re: samsung plasma ps51e550d1r no display

what else other then bad replacement components could cause the three components to blow again on the x buffer board?