Hello.
First i would like to think everyone here for the information on this forum. I came here looking for help on a Samsung plasma. I have spent the past hour reading some of the different post and i am thankful for the information here.
I have what i think is an unusual problem. I have been working with this TV for quite a while. I probably should have given up on it by now but i am committed to using this as a learning experience. I have a diverse electrical background but am new to working on TVs.
I have a Samsung plasma PN43D440A5D. I purchased this TV broken to fix. The TV would not come up. It clicked on and off repeatedly. Thru doing some basic troubleshooting i determined the X-sus was bad. When i disconnected it the TV would come up and give me the start-up sound. I ordered a used board off ebay. Changed it and it worked.... For about 3 days of heavy use.
I tried again to troubleshoot the problem and once again it was the x-sus. This time i tried to dig a little deeper into the TV to look for a possible cause of the failure. After a few attempts the y-sus seemed to be contributing to my problem. I had disconnected it too look at the back side for signs of a problem and when i put it back in the TV wouldn't boot without it disconnected. I then ordered both boards from ebay that were supposedly out of new sets with broken screens.
I have changed both boards and now the TV will come on and function normally for about 10 minutes until the display shuts off but i still have sound.
With the TV on but once the display goes down Vs Va and Vscan all drop out. The Led on the logic board goes from a steady flash to on for 5sec and off for 1sec then back on and so forth.
I want to believe that i just got a bad part from ebay but don't know how to tell for sure which is bad. It is also possible that there is still another problem that could have been cause for the failures.
One other thing i think is worth noting. Every time the TV is power cycled the picture is reset to defaults. The default is dynamic. each time i power up the TV i change it to movie as dynamic showed way to much red. but it continues to revert to dynamic.
Any ideas? I have learned a lot working on this TV but its starting to get frustrating. I do not have a service manual for this TV but a similar Samsung service manual suggest that Va and Vs should stay high with everything disconnected. I do not see that and was told by someone helping me that they would only come up when the boards were connected. Only when the TV is on and working do i see Va and Vs maintained. Should they be high with nothing connected?
First i would like to think everyone here for the information on this forum. I came here looking for help on a Samsung plasma. I have spent the past hour reading some of the different post and i am thankful for the information here.
I have what i think is an unusual problem. I have been working with this TV for quite a while. I probably should have given up on it by now but i am committed to using this as a learning experience. I have a diverse electrical background but am new to working on TVs.
I have a Samsung plasma PN43D440A5D. I purchased this TV broken to fix. The TV would not come up. It clicked on and off repeatedly. Thru doing some basic troubleshooting i determined the X-sus was bad. When i disconnected it the TV would come up and give me the start-up sound. I ordered a used board off ebay. Changed it and it worked.... For about 3 days of heavy use.
I tried again to troubleshoot the problem and once again it was the x-sus. This time i tried to dig a little deeper into the TV to look for a possible cause of the failure. After a few attempts the y-sus seemed to be contributing to my problem. I had disconnected it too look at the back side for signs of a problem and when i put it back in the TV wouldn't boot without it disconnected. I then ordered both boards from ebay that were supposedly out of new sets with broken screens.
I have changed both boards and now the TV will come on and function normally for about 10 minutes until the display shuts off but i still have sound.
With the TV on but once the display goes down Vs Va and Vscan all drop out. The Led on the logic board goes from a steady flash to on for 5sec and off for 1sec then back on and so forth.
I want to believe that i just got a bad part from ebay but don't know how to tell for sure which is bad. It is also possible that there is still another problem that could have been cause for the failures.
One other thing i think is worth noting. Every time the TV is power cycled the picture is reset to defaults. The default is dynamic. each time i power up the TV i change it to movie as dynamic showed way to much red. but it continues to revert to dynamic.
Any ideas? I have learned a lot working on this TV but its starting to get frustrating. I do not have a service manual for this TV but a similar Samsung service manual suggest that Va and Vs should stay high with everything disconnected. I do not see that and was told by someone helping me that they would only come up when the boards were connected. Only when the TV is on and working do i see Va and Vs maintained. Should they be high with nothing connected?
what did we say about hoarding too much stuff and depriving others of them?! *cough* socialism *cough* lol! 
Comment