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Decoder NC+ No Signal - Signal Loss Every 12h, Only TVP Polonia Works; Diodes & Capacitors Intact

Bart.x 26820 12
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  • #1 18098015
    Bart.x
    Level 4  
    Posts: 109
    Help: 2
    Rate: 50
    Hello
    For a long time, the decoder loses the signal every 12h, the message about the lack of signal is displayed and only tvp polonia works
    Nothing is visible inside that is damaged
    All the diodes checked are not broken through the capacitors. Soft original
    Decoder NC+ No Signal - Signal Loss Every 12h, Only TVP Polonia Works; Diodes & Capacitors Intact Decoder NC+ No Signal - Signal Loss Every 12h, Only TVP Polonia Works; Diodes & Capacitors Intact
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  • #2 18098030
    sosarek

    Level 43  
    Posts: 83875
    Help: 9318
    Rate: 15430
    Start with checking INSTALLATION, i.e. cables, converter, plugs ...
    Company Account:
    Z
    Pka, Poznań, 60-850
    Helpful post? Buy me a coffee.
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  • #3 18098049
    Bart.x
    Level 4  
    Posts: 109
    Help: 2
    Rate: 50
    Everything was checked, the converter is a new cable as well, because a few months ago a new cable was installed and a new converter was installed, because that one had been in the ass for several years. So I exclude the disadvantages of satellite installations
  • #5 18098059
    Bart.x
    Level 4  
    Posts: 109
    Help: 2
    Rate: 50
    It all started with a week and every morning you have to reset your mouth set-top box. Then the factory signal returns and the game is reset until the next day in the morning
  • #7 18098066
    Bart.x
    Level 4  
    Posts: 109
    Help: 2
    Rate: 50
    Decoder NC+ No Signal - Signal Loss Every 12h, Only TVP Polonia Works; Diodes & Capacitors Intact
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  • #9 18098100
    Bart.x
    Level 4  
    Posts: 109
    Help: 2
    Rate: 50
    Decoder NC+ No Signal - Signal Loss Every 12h, Only TVP Polonia Works; Diodes & Capacitors Intact
  • #10 18098109
    sosarek

    Level 43  
    Posts: 83875
    Help: 9318
    Rate: 15430
    You have a link above to similar topics where it is clearly stated what to mention.
    Company Account:
    Z
    Pka, Poznań, 60-850
    Helpful post? Buy me a coffee.
  • #11 18098118
    Bart.x
    Level 4  
    Posts: 109
    Help: 2
    Rate: 50
    All capacitors, as I said, are not swollen, and no diode is pierced, checked with a multimeter. It seems that nothing is burnt, today I also put a second power supply with the same parameters, and I will see what happens
  • #12 18098120
    sosarek

    Level 43  
    Posts: 83875
    Help: 9318
    Rate: 15430
    Bart.x wrote:
    All condensers, as I said, are not swollen

    Because they don't have to be !!! You have electronics in your profile and you don't know that they could just lose their capacity, dry ... ???
    You should measure the capacity or change them blindly - the cost is a few zlotys and not be tested "by eye".
    Anyway, if you would go to the trouble and review the linked topics, you would know that this is the most common cause of faults in these decoders.
    Company Account:
    Z
    Pka, Poznań, 60-850
    Helpful post? Buy me a coffee.
  • #13 18099426
    Bart.x
    Level 4  
    Posts: 109
    Help: 2
    Rate: 50
    yes I looked through all the threads you posted, thank you.
    It is true that a damaged capacitor not only swells, but also may have lost its capacity due to old age, tomorrow I will replace individual elements and we will see.
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Topic summary

✨ The discussion revolves around a decoder experiencing signal loss every 12 hours, with only TVP Polonia functioning properly. The user has checked the installation, including cables and converters, which are new. Despite the absence of visible damage to diodes and capacitors, the issue persists, requiring daily resets of the set-top box. Participants suggest that capacitors may have lost their capacity over time, even if they appear intact. The user plans to replace individual components to resolve the issue.
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FAQ

TL;DR: NC+ decoder losing signal every 12 hours? "The 12h is interesting ..." Start with installation checks, then share your ADB model from the sticker to guide targeted fixes. [Elektroda, sosarek, post #18098053]

Why it matters: This FAQ helps NC+ ADB owners diagnose and fix recurring "No signal" and "only TVP Polonia" issues quickly.

Quick Facts

How do I fix NC+ “No signal” that repeats every 12 hours?

Check cabling, LNB, and plugs. If installation passes, focus on the decoder power supply. Electrolytic capacitors can dry out without bulging. Measure capacitance/ESR or replace suspect caps. As one expert noted, “most common cause of faults” in these decoders is bad capacitors. This simple parts swap often restores stability. [Elektroda, sosarek, post #18098120]

What should I check in the satellite installation first?

Verify F‑connectors for tightness and no shorts. Inspect the LNB and its weather boots for moisture. Follow the coax for bends, damage, or water ingress, and confirm the dish hasn’t shifted. These basics save time before opening the decoder. [Elektroda, sosarek, post #18098030]

Only TVP Polonia works—what does that indicate about my setup?

Your decoder may power the LNB but fail to switch polarization or band. DVB‑S uses 13 V/18 V to select polarization and a 22 kHz tone to select band. If switching is missing, only channels on one combination remain. [“Low-noise block downconverter”]

Do capacitors need to look swollen to be bad?

No. “They don’t have to be” swollen to fail. Electrolytic capacitors can dry out and lose capacity quietly. Measure capacitance/ESR or replace them to rule this out. Visual inspection alone misses many failures. [Elektroda, sosarek, post #18098120]

Where do I find the ADB model and why does it matter?

Read the exact model from the rear/bottom sticker and share it. Helpers ask for it because model‑specific parts and known fixes differ, speeding diagnosis. [Elektroda, sosarek, post #18098091]

I reset the decoder and it works until morning—what next?

A time‑dependent return of the fault suggests borderline power components. Replace the electrolytic capacitors in the power section even if they look fine. This addresses thermal and aging drift. [Elektroda, sosarek, post #18098120]

Can swapping the external power supply diagnose the issue?

Yes. Try a second power supply with the same parameters and observe if the behavior changes. It’s a quick isolation step before internal repairs. [Elektroda, Bart.x, post #18098118]

Which capacitors should I replace first?

Start with electrolytic capacitors in the decoder’s power supply section. If you lack an ESR meter, “measure the capacity or change them blindly” using quality low‑ESR replacements of equal capacitance and adequate voltage. [Elektroda, sosarek, post #18098120]

How do I replace capacitors safely? (3‑step How‑To)

  1. Unplug the decoder and wait; discharge the PSU capacitors safely.
  2. Note polarity and values; replace with low‑ESR parts of same µF and equal/higher voltage.
  3. Inspect solder joints, reassemble, and test signal on multiple channels. [Elektroda, sosarek, post #18098120]

Do I need special tools to diagnose this?

A multimeter is enough to start; check diodes and basics, and compare behavior with another compatible power supply. If measurements are inconclusive, replacing suspect capacitors is inexpensive. [Elektroda, Bart.x, post #18098118]

What if my LNB and cable are new and I still get ‘No signal’?

If you’ve refreshed LNB and coax and the fault persists, prioritize the decoder internals. Replace or measure electrolytic capacitors, since they’re a frequent failure point in these units. [Elektroda, sosarek, post #18098120]

Where can I read similar repair threads for this ADB/NC+ box?

Follow the linked topics suggested in the discussion; they outline proven parts to replace and recurring faults for these models. “It is clearly stated what to mention.” [Elektroda, sosarek, post #18098109]
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