A dead satellite receiver repaired. Model: Humax F1-ACE
A doctor came to my workshop and he brought a dead satellite receiver with him. He said that it was working the night before but in the morning, he could not turn it on. This was a power related case and was easy fix. Let the repair begin.
I took some screws off and this is what I found inside. A dirty board and power supply. This is an after cleaning photo. Usually when dealing with no power case, common sense to start with the main power fuse to see if it was open or not. In this case the fuse was intact. My thoughts shifted to something else. I needed to do power testing before any further action. I usually test the main power supply disconnected from the main board then I test it again with the power board connected to the board.
Fortunately, the output voltages were written on the board and that was great because I could know exactly what I am looking for in the voltage reading. There were 12, 33, 5, and 24 volts outputs. This is the exact voltage reading that I got when I did the voltage reading test. This test was done without the main board connected. The moment I connected the power supply to the main board, all the voltages reading jumped up instead of going down.
For example: 12 became 24, 33 became 55, 24 became45 and 5 became10 volts. That did not sound right. There was something wrong with the power supply. I was thinking of capacitor problem. One or man of the capacitors had gone bad that was causing this problem. The question was which one? I got my ESR meter out and started checking for bad capacitors. It was a fast checking and I got the bad capacitors.
As you can in the photos, all the bad capacitors are marked with ink markings. They were two 1000uf/10 volts, two 220uf/30 volts and two 470uf/30 volts. After all these capacitors replaced, thereceiver came back to life.
The doctor came to my workshop to pick up his working satellite receiver and made a nice funny comment. He said that we are both doctors; I heal human beings, and you heal electronic and electrical equipment. I never thought of it like that but it does make sense. Mission accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Principe
January 31, 2018 at 6:04 pm
Thank you Waleed,
My Combo s2+t2 decoder is having a power problem: when I switch it on it turns of itself after about 10 seconds. I tried to turn it off and even unplugging it,return it on but there is no change.What is the problem?
sunFD
September 5, 2018 at 8:09 pm
That was cool fix.
I have a similar fault on a strong decoder not powering. I tested the power board was ok with other decoder. the fault frm the mainboard. all capacitor look good. diodes ok. how can i test capacitor with multimeter have no ESR tester or what other posible cause of faults.
Zak
December 31, 2018 at 12:07 am
My receiver has no inflated cap on power board and I even measured its power board outputs, all at correct voltage. But does not turn on. Sometimes i turns on and as long as it is on, works perfectly fine but if I turn it off, the it has difficulties turn on (out of 10 times 9 times doesn't turn on once turns on).
alex
April 26, 2020 at 3:00 am
my eurostare receiver- when i give a power supply to my receiver it makes on after long time(around 10hrs) what is wrong with this?
1,power ic
2,capacitores
Bidemi
June 7, 2021 at 3:10 am
Good day, please my str 4940 has picture board problem. Please where can I get it.