You better do not open the TV unles you know something about electronic.
I was trying ti fix mine and did more damage. It is very hard to replace these chips if you do not have proper tools and soldering expirience.
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The convergence IC's in this TV set are bad. Both IC's should be replaced at the same time. They are labeled STK 392-040. Use only the ones that are not replacements but from a reliable source. The complete convergence board is no longer available from Samsung, so this is why these IC's need to be replaced. You will also need the service manual for this TV set as after vthe IC's are replaced you will need to go into the service menu and do a convergence alighnment. Good Luck
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This is weird. I also have a plasma 50" model PS5Q91HDX and on the 5/02/11 the screen went blank when my friends daughter was watching a Wiggles DVD. The image kept coming back, flashing a scene or two before going black again. But the sound is perfect.
I wonder what is going on? Is anyone else having trouble with their 3-4 year old Samsung 50" TVs???
1 they are either rebuilt or a defective returned to stock accidentaly
2 yes securly attaching it helps the heatsinks keep even cooler. no you don't need heatsink grease.
3 if the tolernace is very far out of wack then it woun't take long befor they blow. once you have instaled the new board turn on the set enter mute,1,8,3 then perfect focus on the remote let it do it's thing then shut off the tv and resart the tv and press perfect focus again.
Did you try the manual lense focus in the back? There is a wing nut on it and it's pretty easy to change. You just need someone to look at the TV and tell you when it looks good. Additionally for the Blue tube, it's on the far left. You take off the bottom panel in the back to get to this area. Good Luck.
perfect focus functions are based on service mode setup...or factory settings. if the alignment of these setting are loss then the unit wont perfect focus. does the unit have a complete loss of convergence. a complete loss of convergence indicate possible failure of convergence amps.
Perfect "FOCUS" is a misnomer.Convergence is the
real issue.Enter servicer mode--perform accurate
convergence alignment procedure--activate perfect
focus as last step to 100% alignment.If you have a
High-Definition source,check procedure for that.
Just had the exact same problem. A Technician from an authorized Samsung service center checked mine and said the convergence unit was gone and it does not allow the TV to turn on. He demo-ed by turning the convergence off and the TV turned on but the picture is very poor and out of focus. He also told me a need a blue tube and other parts for a total cost of ~ $800. No impressed as this TV is only 4 yrs old and is now worthless.