This unit came in with no sound or picture
do you have any ideas?
No picture or sound. When I plug into wall power light comes on momentarily and sounds inside like when TV normally powers up. But nothing after
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Power ON signal voltage should come from the main board to power regulator board. It does not come now. Check for the reason. Probably, the main board will have the fault. Contact any service technician. http://electronicshelponline.blogspot.com/
Sounds like main board fault. Contact any service technician.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Do you see any light on the screen? Is the power LED ON? If the TV comes ON and no back light on the screen, it could be the inverter(s). If there is no power, or DEAD it could be the power board. Disconnect the TV from the AC outlet on the wall, for about 15 minutes and plug it back, see if it will come ON.
I do recommend checking the power coming out of the power supply to make sure it is not to high. It is common for these units to have faulty internal capacitors in the power supply. It may be shorting out other components. You can buy a capacitor tester or use an ohmmeter.