Hello, I am new to this forum so hello to everyone. I have been given the task to try and diagnose a Samsung PN59D6500 3D Plasma for no display. I am an automotive mechanic and specialized in the electronics end of the vehicles. Been in the business for 34 years now. I love to fix things.
This tv problem started off by losing the display but had volume. Unplugging it for a while and trying again would have the set work for about 5 minutes then the same problem. The tv has been brought to me with no display or volume.
I found some tests online and on this forum. This is what I have so far.
On plug in, I hear a click, I have voltage from main board for ps_on, 3.2v on the VS_on from the logic board, I lose everything after 2 seconds. During that time, I do not have any voltage on the VA and VS on SMPS. I disconnect the X main, still the same. The Y main feeds the X main so I cannot try disconnecting Y main without losing X. Same condition and light on logic board flashes every 6 seconds. I tried to disconnect the feedback ribbon from the Y main to the logic board and now have the logic board trying multiple times to power up the SMPS instead of once. Oh, I also tried to eliminate the mainboard by jumpering the PS-On and the pins 3-4 on the logic. No screen activity and still no VA or VS voltage at test points. I was wondering if anyone could steer me in a direction to isolate and pinpoint the problem. Thanks
This tv problem started off by losing the display but had volume. Unplugging it for a while and trying again would have the set work for about 5 minutes then the same problem. The tv has been brought to me with no display or volume.
I found some tests online and on this forum. This is what I have so far.
On plug in, I hear a click, I have voltage from main board for ps_on, 3.2v on the VS_on from the logic board, I lose everything after 2 seconds. During that time, I do not have any voltage on the VA and VS on SMPS. I disconnect the X main, still the same. The Y main feeds the X main so I cannot try disconnecting Y main without losing X. Same condition and light on logic board flashes every 6 seconds. I tried to disconnect the feedback ribbon from the Y main to the logic board and now have the logic board trying multiple times to power up the SMPS instead of once. Oh, I also tried to eliminate the mainboard by jumpering the PS-On and the pins 3-4 on the logic. No screen activity and still no VA or VS voltage at test points. I was wondering if anyone could steer me in a direction to isolate and pinpoint the problem. Thanks
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