Saturday, November 19, 2011


Hello Mr Kimathi.

Amos: I hope you are fine with your daily activities, am fine too. I am receiving now days dead satellite receivers, with many problems, I can only solve small problem like burnt fuse, diode, transistors but it is difficult to repair them because I don’t have enough knowledge about it. All receivers use switch mode power supply, many of these power supplies die, and all these trouble model come from China. How can you help me how to deal with satellite receives, many peoples in my area have
satellite dishes and use them.
Have a good day.

Humphrey: Glad to hear from you, here in Kenya these receivers are not very common and therefore I would not know most common problems associated with them.
But from what you have said if most problems is power related then this is quite simple…in fact power problems are the easiest to solve and all switch mode power supply are almost the same irrespective of the equipment.
Use the troubleshooting procedure outlined in your book...Also if you can get a circuit of one model from the internet can help you to understand the circuit better. By the way how much are they costing there in Tanzania in us dollars?

Amos: I write to you to ask some information about smps for digital satellite receiver model no Strong srt 4650,The cost of this receiver is Tsh 200,000/=usd 111.when I open power supply section I found main capacitor damaged,33uf,400V.after checking all components around it everything was ok. when I switched on no voltage at main capacitor I discover one fuse open after replace it the voltage reach the main capacitor but no display, when I check the main capacitor is still holding the charge even if I switched off I realize there is problem why the main capacitor don’t discharge and still holding the charge for long time even if I switched off I ended here. I need your help sir; I have not read the smps book am in process to buy it.

Have a good day

Humphrey: Read chap 5 of your book for more info on this. Again send me the picture of this power supply board. But if the fuse was open I suspect there is a shorted component also on the supply (primary)...Like the control ic or transistor whichever is used in this supply.
If the capacitor is still holding charge check if the start- up resistors are open (they are used to discharge the main capacitor also) Power problems are the easiest to solve Amos…do you have testing electronics components by jestine yong…I suggest you start with this book because it has all the basics before you go to advanced level.
 Kind regards

Amos: How are you? The enclosed attachment is the picture of digital satellite receiver, which I trying to repair, the voltage is reaching the main
capacitor and no secondary output voltage and the main capacitor don’t discharge.
Have a good day

Humphrey: There are very few components here. You can check them out quite easily but from what you have said already, the highlighted are the most suspect.

I strongly suggest you change the I.C highlighted directly…before you even start testing on the other component…is it viper50? I can’t see the number. Whatever it is please change first and test the supply again…it could be the only component now which can cause havoc.

Regards Humphrey

Amos: I hope you are fine with your daily works. Am fine too. The power supply and Digital Satellite Receiver Strong model no SRT 4650 is back to normal, I checked all secondary diode and the fuse as you direct me to test them, I test them all were ok, The problem in my area is how to get spare part, it takes a lot of time to get the IC NO A6351 As you direct me to replace, after replace it, everything is ok and the receiver is back to normal, thank again for your help.

Have a good day.

Humphrey: Congratulations for the job well done Amos.

Have a nice day

This is a direct email support between a customer from Tanzania Mr. Amos Mponda and myself back here in Kenya.

Humphrey Kimathi
Author CRT Television repair course


    welcomback to daily job . and thanks so much for a good repair report

  2. Thank you Mr Beh, hope you are doing fine that end.

    Regards Humphrey

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  7. it is a good help website for electronics workers, thanks in advance

    1. Thanks and welcome sekki for your feedback
      Regards Humphrey

  8. Hello, good day Sir
    i am an electronics technician and i also do satellite installations in Ghana.
    a customer gave me a faulty strong srt 4922a decoder which is power off, i checked and voltages on the power board is working but the decoder is not switching.. pls any help?

    There is another one too like that but that one is on stand by... any help on that too?


    1. Read my article on troubleshooting smps for more info on this.

      Regards Humphrey