Hi Community.
I have a SAMSUNG PS50B450 with a lot of problems, some have been solved, one haven´t.
History of the PLASMA TV
as I got it there where sound but no picture. All I know at that stage was, it has been in a workshop and one of the power boards where gone. By looking at the Mainpower-Board I saw that some work has been done at it and one of the FETs has been desoldered. Resoldered that and still no Picture and also no sound. Decided to buy a used spare. After fitting and powering on Sound but no picture. Decided to swap the Y-Sus Board. After replacing that, sound and picture came on. By checking picture quality I saw a stripe of darker and brighter pixels from the center of the Display to the right end of the display vertically. Affected was only one third of the display started from the center. If you devide that Bar into three parts the middle one was the funniest. The left and right one appeared more like a shadow with a chessmate pattern.
After 2-3 Minutes of running the TV the picture was gone and the heatsink of the Y-Sus started beeing hot. I checked the other heatsinks, they appeared as normal. Got a new one and also replaced the Y-Buffer. Turned on and picture and sound came on, but still the bars from top to down of the screen. Went further and replaced the X-Sus Board (only the upper Board) and now after adjusting Va, Vs, Ve and VSC Voltages picture stays on and the stripe of funny pixels is nearly gone, used a DMM set to 250V AC used the Connectors from the Mainpower-Board to adjust Va and Vs, other is taken from the testpoints on Y-Sus and X-Sus.
Only a brighter bar of pixels stays and I can´t get rid of them. The picture as such is visible through the Bar. It seems only the brightness in this area is not adjustable.
I also went into the service menu with the button-combination and reset everything to their defaults.
I left it running for, at least, 2 Hours and after playing around with contrast, brightness, sharpness and cellbrightness the bar is nearly adjusted out. I matched the rest of the screen to the brightness of the bar.
Question is now what can now still defective? I tryed to put some pressure on the ribbon connectors down on the "Z-Board" (it is the board on the bottom of the TV), thought could be a loose fitting cable, but no change. Cleaned also the connectors for the cables comming from the T-Con Board.
T-Con Board it self damaged? Anybody here with same sort of problem and a solution?
I will be appreciated for your help.
Tommes
I have a SAMSUNG PS50B450 with a lot of problems, some have been solved, one haven´t.
History of the PLASMA TV
as I got it there where sound but no picture. All I know at that stage was, it has been in a workshop and one of the power boards where gone. By looking at the Mainpower-Board I saw that some work has been done at it and one of the FETs has been desoldered. Resoldered that and still no Picture and also no sound. Decided to buy a used spare. After fitting and powering on Sound but no picture. Decided to swap the Y-Sus Board. After replacing that, sound and picture came on. By checking picture quality I saw a stripe of darker and brighter pixels from the center of the Display to the right end of the display vertically. Affected was only one third of the display started from the center. If you devide that Bar into three parts the middle one was the funniest. The left and right one appeared more like a shadow with a chessmate pattern.
After 2-3 Minutes of running the TV the picture was gone and the heatsink of the Y-Sus started beeing hot. I checked the other heatsinks, they appeared as normal. Got a new one and also replaced the Y-Buffer. Turned on and picture and sound came on, but still the bars from top to down of the screen. Went further and replaced the X-Sus Board (only the upper Board) and now after adjusting Va, Vs, Ve and VSC Voltages picture stays on and the stripe of funny pixels is nearly gone, used a DMM set to 250V AC used the Connectors from the Mainpower-Board to adjust Va and Vs, other is taken from the testpoints on Y-Sus and X-Sus.
Only a brighter bar of pixels stays and I can´t get rid of them. The picture as such is visible through the Bar. It seems only the brightness in this area is not adjustable.
I also went into the service menu with the button-combination and reset everything to their defaults.
I left it running for, at least, 2 Hours and after playing around with contrast, brightness, sharpness and cellbrightness the bar is nearly adjusted out. I matched the rest of the screen to the brightness of the bar.
Question is now what can now still defective? I tryed to put some pressure on the ribbon connectors down on the "Z-Board" (it is the board on the bottom of the TV), thought could be a loose fitting cable, but no change. Cleaned also the connectors for the cables comming from the T-Con Board.
T-Con Board it self damaged? Anybody here with same sort of problem and a solution?
I will be appreciated for your help.
Tommes
Comment