Samsung HPT5044X/XAA plasma keeps blowing buffer ICs

[mattpd]

This one started with no picture but had sound, protection light lit on YSUS. Found the blown buffer IC and replaced it. I also used a eBay repair kit on the YSUS which replaced all the blown FETs and more.

Plugged it in and the screen lights up, but with garbage on screen. About 15 seconds later one of the IC on the top buffer board blows and YSUS protection comes on again.

Replaced blown buffer IC then check YSUS. Nothing is shorted this time. Installed both and turn on TV. Garbage on screen, 15 seconds later a different buffer IC blows.

Repeated this a few more times and now I have gone through 5 ICs already. Three of them on top board and two on bottom board. I am guessing that YSUS is malfunctioning in some way, but it's not the same failure that it had originally.

Any idea?

[RCA2000]

Re: Samsung HPT5044X/XAA plasma keeps blowing buffer ICs

Hate to say this...but repeated blowing of Y buffers..particularly the SAME One..often means a bad PANEL.

[mattpd]

Re: Samsung HPT5044X/XAA plasma keeps blowing buffer ICs

Hate to say this...but repeated blowing of Y buffers..particularly the SAME One..often means a bad PANEL.

Different IC every time. Still think bad panel?

[libyantiger]

Re: Samsung HPT5044X/XAA plasma keeps blowing buffer ICs

got samsung plasma tv from recylce bin ...the panel have miniature crack!!

i was hoping i can fix it

trouble shooting reveals that the problem is in the y-buffer ...the y board tests ok


...looks like the fate is with me ...with an incredible luck i find yet another plasma in recycle bin and of an identical model


i find all boards has been stolen by another tech (maybe) but the y-buffer is there

i quickly got the y buffer ...the problem that it was full of dust dirt and tiny rust


i started cleaning it with thinner solution and brushing it with tooth brush to cleanse all the rust and dust away


after the job is done i installed the buffer in tv and i fired up the tv ....and guess what??


the tv worked!! the picture is there ...but it is not perfect...it sort of "double image " problem

with the word "no signal" appears twice ...


i tried to reset the ribbons ...while the tv is off and when i refire the tv ....it is nothing


i tested and find the buffer got shorted again




from your experience


could the buffer be shorted because of the fact that it has poor connection to the ribbons due to rust


or the bad panel (because of the small crack)is loading down the buffer "but the picture appeared ...smeared yes

...but it was there "