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Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
I have the same two problems! "Zone 2" works, but the main amp will make a noise and then stop working. Sometimes when I change the listening modes around it will start working. Lately, though, "zone 1" has gone out altogether.
On this type of problem, the first thing I check is the AC line fuse on the power supply.
Follow the Ac plug wire to the power supply board and where it plugs in, you will find the fuse.
It checks bad. Replace it.
It goes out again. Call a Servicer.
It is good. Check for the five volts that goes to the Main PCB.
No five volts, change the power suppy (SMPS)
Five volts is there, more than likely the Main needs replaced and SMPS.
For a Samsung Servicer in your area: