An old man who lives nearby my shop brought this satellite receiver for repair. Topfield is a good satellite receivers and usually the main cause of them going bad usually capacitors.




The main problem would be, are they bulged and very easy to see find or we have to check them one by one? Let us find out.

satellite receiver repair

The first thing I noticed after I powered up the device is the ticking noise that was coming out of it which confirmed my experienced guess.

fix satellite repair

As I took the top off and exposed what inside, I headed directly to the power supply and started doing measurements.

how to repair satellite receiver

It was very clear to me that it will take longer than expected to repair this device since I do not see any bulged capacitors. Let the fun begin.

how to fix satellite receiver

There is a way to check the capacitors other than using the ESR meter and that to follow the bad line. For example, you can see measurement printed on board.




That is my clue to bad capacitors. The first reading was 38 volts. When measuring that with my multimeter, I got 45 volts which is way too high for that line. I traced all the capacitors in there and replaced them. I powered the device and guess what? The device came on for about two minutes then it started shutting on and off. I was getting close. So I tested the next line which was 22 volts and the reading there was 35. Again, that was too high so I traced that line and replaced all the capacitors there.

how to fix and repair satellite receiver

This view is from the other side of the board and you can see the traced that I followed in this repair.

bad capacitors

Here are the bad capacitors that I found in the device.

1000uf/16 volts

220uf/35 volts x 2

47uf/50 volts

100uf/35

servicing satellite receiver

As you can see, this method worked out fine. This is the first time that I used this method of repair. It really worked. In other words, fix the line that need fixing and do not mess with the things that are ok. A repair technician and my friend suggested this method of repair. You as technician might not follow this way of repair, that is understandable but you can use any way that fits the need.

fluke 112 meter

This was the final reading on the output of the LNB connection.

Mission accomplished.

waleed

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.

P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.

Note: You can check his previous repair articles in the link below:

https://www.electronicsrepairfaq.com/dynamic-stereo-headphone-repaired-sony-mdr-7506

About

Jestine Yong works as an Electronics Repair Lecturer in Kuala Lumpur Malaysia and his training website is http://www.NoahtechElectronicsTraining.com. You can check out his repair blog at http://www.JestineYong.com

12 comments on “No Power In Satellite Receiver Repaired- Model: Top field TF3000FI

  1. Albert van Bemmelen says:

    Another way can always be to use an oscilloscope and look for a big ripple on top of the DC voltage. Measuring a power supply’s ripple with my Tektronik oscilloscope also gives me at the same time the voltage level and or frequency. Information which my digital meter isn’t capable in showing.

    1. Waleed Rishmawi says:

      True but if you do not have a oscilloscope there is another way of doing it. Thanks for sharing

  2. dalganjan says:

    what is the voltage on that line after replaced capacitor .

    1. Waleed Rishmawi says:

      Both were back to normal

  3. biruk aweke says:

    Hi Mr waleed very nice explanation thanks for sharing.

  4. BASHEER KHAN says:

    THANKS VERY NICELY EXPLAINED AND VERY INFORMATIVE FOR TECHNITIONS.

  5. charles karonga says:

    Thanks its my first time to hear of this method I will try it on my repairs thank you Jestine for bringing a recap of previous repairs I almost missed this one.

  6. jai says:

    Good job Waleed

  7. MontyAbdo says:

    Thanks a lot.

  8. Williams D. says:

    Thanks Mr. Waleed.I have a strong receiver srt 4922 that if i power it, what it shows is Lnbf how can i solve this problem please help!

  9. Infinitywealth says:

    Thanks I will try this method on my stg 4922

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Open