Samsung TV Model# CW-5012ZQ Repair Tips
Opened the TV back cover and started looking for bad or burnt component. I was checking the parts in the power supply and to my surprise the main capacitor was still holding a charge of 300 volts and that tells me that something in the power supply that is not allowing it to discharge.
So I started checking with the volt meter and found out that the voltages are reaching the power IC (STR 50103A) but nothing is coming out. IC was getting hot and first thing I thought about was to change the IC and I did but there was no change except the main capacitor started to discharge faster.
I completed the eye scan on the PC board and found two bad capacitors (top bulged) 100uf/100v and 1uf/100. The 1uf/100v has no polarity on it and I had to come up with a replacement for it. So I got two capacitors 2.2uf/100v, and put them together in series (the negative leg to the negative leg and twisted the wires and soldered them together).
So the total capacitance came up to 1uf/100 volts. I soldered these parts on the board and the TV came to life.
I connected the TV set to my Satellite dish receiver and started watching a show on TV. After turning the TV for a few minutes, I started hearing squealing noise coming from the fly back transformer. I never heard this kind of noise before but it was surely loud and annoying.
I turned the TV off and started checking the area around the fly back transformer hoping that I will find the fault in some of the component and not in the actual fly back transformer. I saw a diode in the high voltage area that did not look good. The color of that diode was turned brown giving me the indication that it was overheated. I touched the diode (TV off of course) and found that it was a little bit warm. I removed the diode and replaced it with a new diode and turn the TV on again, and wow, the squealing sound disappeared.