HCL4715W - Shut off unexpectedly and won't power on..

It is most likely the convergence amps causing the problem.. With the power off and the unit unplugged remove the back. In the upper right corner - looking in the back - you'll see a board with two relatively large Ic's on it marked STK392-040. On the left corner of the board there is a connector, the board is marked +/-20v... Unplug that connector and plug the Tv back into power and try turning it on... If it powers up with audio you've just diagnosed your first Samsung.

You have three options here (1) buy the whole board and replace it, (2) send the board out for repair, or (3) buy the amps and 3.9 low ohm resistors to repair it yourself... It will all depend on the skill level you think you have..

If it's limited, sending the board in would be my suggestion and I'd recommend sending it to a shop that can modify the board with a cooling fan, like the picture above, to eliminate as much heat as possible. We modify them automatically for the ones we get in here. It's a $60.00 modification but it will save you from replacing the Ic's every couple of years.

If I can help any further just let me know.

Bill



William Rayburn, CET

Premium Technologies

PO Box 442

Long Beach, WA. 98631

360-642-4993

[email protected]
It is most likely the convergence amps causing the problem.. With the power off and the unit unplugged remove the back. In the upper right corner - looking in the back - you'll see a board with two relatively large Ic's on it marked STK392-040. On the left corner of the board there is a connector, the board is marked +/-20v... Unplug that connector and plug the Tv back into power and try turning it on... If it powers up with audio you've just diagnosed your first Samsung.
You have three options here (1) buy the whole board and replace it, (2) send the board out for repair, or (3) buy the amps and 3.9 low ohm resistors to repair it yourself... It will all depend on the skill level you think you have..
If it's limited, sending the board in would be my suggestion and I'd recommend sending it to a shop that can modify the board with a cooling fan, like the picture above, to eliminate as much heat as possible. We modify them automatically for the ones we get in here. It's a $60.00 modification but it will save you from replacing the Ic's every couple of years.
If I can help any further just let me know.
Bill

William Rayburn, CET
Premium Technologies
PO Box 442
Long Beach, WA. 98631
360-642-4993
[email protected]

PS. The amps aren't cheap either - about $30.00 a piece... PS. The amps aren't cheap either - about $30.00 a piece...