I have been working on this TV for a while now. I found the 5v line on the YSUS board was only 4 ohms resistance. I thought that was the problem, so I replaced the board. It STILL isn't working. When everything in the TV is connected, there is standby LED flashing and no sound from the TV, its dead. No clicking or anything.
I decided to start removing one board at a time to see if anything changes. I found that when the bottom left buffer board is connected to the top, the voltages drop out. I also found that if the ZSUS board is connected to the bottom buffer boards the voltages drop out.
I found that if I just have the power supplies connected to in the tv, the relays will click and I get all voltages for a few seconds then relay click again and voltages go to 0v.
I have a DC power supply. I started inputting 5v to see the reaction (high current spike). I get high current and only 3.5V on the YSUS board when the top bottom and top buffer boards are connected. When I disconnect the bottom buffer from the top, the current is good and I get 5V.
I also found that the voltages drops and current spikes when I have the bottom 5v connector on the YSUS board connected to the control board. When it is removed, voltages is 5v and normal current.
I tried connecting 5v into the control board, but no current spike and 5v is good.
I am getting frustrated with this tv. Can anyone give me some direction as where to go from here. Is the problem the control board or one of the buffer boards, or even the bottom boards.
I decided to start removing one board at a time to see if anything changes. I found that when the bottom left buffer board is connected to the top, the voltages drop out. I also found that if the ZSUS board is connected to the bottom buffer boards the voltages drop out.
I found that if I just have the power supplies connected to in the tv, the relays will click and I get all voltages for a few seconds then relay click again and voltages go to 0v.
I have a DC power supply. I started inputting 5v to see the reaction (high current spike). I get high current and only 3.5V on the YSUS board when the top bottom and top buffer boards are connected. When I disconnect the bottom buffer from the top, the current is good and I get 5V.
I also found that the voltages drops and current spikes when I have the bottom 5v connector on the YSUS board connected to the control board. When it is removed, voltages is 5v and normal current.
I tried connecting 5v into the control board, but no current spike and 5v is good.
I am getting frustrated with this tv. Can anyone give me some direction as where to go from here. Is the problem the control board or one of the buffer boards, or even the bottom boards.
