An old man brought this satellite receiver to be fixed. It was a dead receiver. Took the cover off and scanned the power board with my naked eye but could not see anything there.
I powered up the receiver and started to test the voltages in the secondary power supply. All the diodes in the secondary section were not getting any kind of voltages whatsoever. That is an indication of a bad primary power supply. I tested the voltages at the main capacitor and I could read the 300 volts there.
There was a power IC (5L0365R) located near the main capacitor. And the 300 volts were reaching the input on that IC and the out; I could not get any reading which gave me the indication that it is a bad IC. I replaced that with the same exact number part but to my shock, the machine did not work.
It was time for me to start checking the entire component in the primary section of the power supply. Well, my checking lasted only two minutes when I found a bad diode on the same line of that power IC. I took off board and checked it out and found out it was a bad diode. Somehow that bad diode was putting the voltages down on that power IC. The moment I replaced that diode, the receiver came to life and I got a good picture.
I called the guy and he came and got his receiver. He said he did not know how to install it to the TV set at home. I had to go with him to his house and install everything for him. He was using the RF connection to connect the receiver to his TV. That is not the best way to connect it to the TV. I suggested the RCA plugs which provide better picture and an easy way to connect it to the TV inputs without programming the TV.
He gladly agreed and was really happy that the receiver was working and the picture on his TV set was much better than before.