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After connecting the antenna, the LED of the power supply turns off.

Krzychu_183 7218 12
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16937681
    Krzychu_183
    Level 7  
    Hello, the problem is as follows. I have 4 TVs at home. Recently, I replaced one and after connecting it to the antenna, the power supply goes out and there is no signal on any TV. But when I disconnect it, everything returns to normal. Can someone explain it to me?
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  • #2 16937691
    Artee
    User under supervision  
    Badly connected splitter, no separator and a short circuit is made. How are you connected?
  • #3 16937698
    Krzychu_183
    Level 7  
    Signal splitter for 4 days Everything was going so far, because there was a TV connected in this room, I just replaced it and put a new one.
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  • #4 16937735
    Artee
    User under supervision  
    It is very possible that the old TV had a separate antenna socket and the new one does not. Unless you gave a new cable and it has a short circuit. I don't see any other reasons. Well, unless there are some power leakages with this new TV, but it's unlikely. Make a test and briefly shorten the pin and screen in the TV plug on the cable. When the diode turns off, it means that you do not have a separator in the system and this TV set will cause such an effect. I note that there is a minimal risk of burning the power supply during this attempt, but if the TV also goes out, it means that it can withstand.
  • #5 16937751
    Krzychu_183
    Level 7  
    Okay thanks ... One more question. What separator to install there, if this is it?
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  • #7 16937766
    Krzychu_183
    Level 7  
    Well, when I come back, I'll do it. Thank you very much.
  • #8 16937893
    andpol 33
    Level 39  
    From poverty, you can use the plug from the antenna power supply.
  • #10 16941975
    Krzychu_183
    Level 7  
    It was enough to isolate the cable screen from the usual anethene terminal with a heat-shrinkable sheath and blast
  • #11 16942010
    LeDy
    Level 43  
    And you think that if it were good then humanity would invent some sort of separators?
    Why not do the entire installation with one wire?
  • #12 16942191
    andpol 33
    Level 39  
    In a moment there will be a topic: "I have distortions - help me". You've done tinkering, so don't boast about it because someone else will think it should be like that.
  • #13 16954801
    Krzychu_183
    Level 7  
    Since it works, it's not a stupid solution. I've been to several supermarkets but they didn't have such separators, so I solved the problem like this.
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Topic summary

✨ The discussion revolves around a problem where connecting a new TV to an antenna causes the power supply LED to turn off, affecting all TVs in the home. Users suggest that the issue may stem from a poorly connected splitter or a lack of a separator, leading to a short circuit. It is noted that the new TV might not have a separate antenna socket, unlike the old one. Recommendations include testing the connection and using a DC voltage antenna separator to resolve the issue. Users share links to affordable separator options and discuss alternative solutions, such as isolating the cable screen. The conversation highlights the importance of proper installation and the potential risks involved in troubleshooting.
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FAQ

TL;DR: New TV connected → antenna PSU LED dies? Run a 3‑step short-to-test, then add a DC separator; there’s “minimal risk of burning the power supply.” [Elektroda, Artee, post #16937735]

Why it matters: This FAQ helps multi‑TV homes fix splitter/separator faults that kill signal when one set is plugged in.

Quick Facts

Why does the antenna power LED turn off when I connect a TV?

A coax short is forming when that TV is connected. With a splitter and mast preamp, you need a DC separator so power reaches the amp without shorting at the TV input. Without it, the PSU trips and the LED goes dark. [Elektroda, Artee, post #16937735]

How do I test if a separator is missing?

Unplug the TV, access its antenna plug, and briefly short the center pin to the screen. If the antenna PSU LED switches off, your installation lacks a separator on that branch. Quote: “minimal risk of burning the power supply.” Do it briefly and only for diagnosis. [Elektroda, Artee, post #16937735]

What separator should I buy?

Use an inline DC antenna voltage separator. Any inexpensive model is fine because they perform the same basic function: pass RF, block DC to the TV. As one expert put it, “any cheap DC voltage antenna separator.” [Elektroda, Artee, post #16937758]

Can I reuse the plug from an antenna power supply as a separator?

Yes, in a pinch you can repurpose the plug from an antenna power supply as a makeshift separator. Treat this as a temporary workaround until you install a proper inline separator for reliability and safety. [Elektroda, andpol 33, post #16937893]

Is insulating the cable screen a safe fix?

No. Isolating the braid from the connector may appear to restore signal, but it violates proper coax practice and can cause distortions and instability later. Avoid hacks; install a separator instead for a durable repair. [Elektroda, andpol 33, post #16942191]

How should I connect a 4‑way splitter to avoid shorts?

Ensure the power‑injection path to the mast amplifier includes a separator so DC does not reach TV tuners. A poorly connected splitter or missing separator creates a short at a TV input and drops the PSU. Correct the wiring and add the separator. [Elektroda, Artee, post #16937691]

Could the new TV itself be faulty?

A defective TV with power leakage is possible but unlikely. The consistent trigger is a missing separator or short at the TV’s antenna input. Rule that out with the short-to-test before blaming the set. [Elektroda, Artee, post #16937735]

Why did everything work with the old TV but not the new one?

The old TV may have had a separate antenna socket or construction that didn’t expose the short. The new TV’s connector arrangement can reveal the missing separator, tripping the PSU when connected. Add the separator to fix it. [Elektroda, Artee, post #16937735]

Will the short-to-test damage my power supply?

The advisor notes a “minimal risk of burning the power supply,” but the brief test typically just turns the PSU LED off. Keep it momentary, and don’t repeat unnecessarily. Proceed only if you accept the risk. [Elektroda, Artee, post #16937735]

What does “screen” mean in this context?

“Screen” refers to the coaxial cable’s outer shield or braid. Shorting the center pin to the screen means touching the inner conductor to the shield to simulate a DC short for diagnosis. Do this briefly during the test only. [Elektroda, Artee, post #16937735]

How do I install a DC antenna separator?

  1. Disconnect power to the antenna PSU and unplug the TV’s coax.
  2. Insert the inline DC separator at the problem TV’s coax lead per arrow/label.
  3. Reconnect the coax, power the PSU, and verify the LED stays on and channels return.
    “Any cheap” unit works. [Elektroda, Artee, post #16937758]

Stores don’t have separators—what then?

Some brick‑and‑mortar shops may lack stock. The OP couldn’t find one locally and resorted to a workaround. Order online or from a specialist electronics store to get the right part instead of improvising. [Elektroda, Krzychu_183, post #16954801]

Is insulating the braid a long‑term solution?

No. Community feedback warns that this tinkering leads to degraded performance. Expect distortions later, and it can mislead others into unsafe practices. Replace hacks with a proper DC separator. [Elektroda, andpol 33, post #16942191]

My setup has 4 TVs and only one causes the outage—is that normal?

Yes. In the case discussed, 1 of 4 TVs (25%) triggered the PSU shutdown. A single branch missing a separator can drop signal to the entire installation until fixed. [Elektroda, Krzychu_183, post #16937681]
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