Low ampere adaptor for a higher rated TV

Forums › Off topic › Low ampere adaptor for a higher rated TV - Bad Idea?

CrashAndBurn

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#255844 3-Sep-2019 09:16

My parents have an LCD TV which uses a 19V 2.53A adaptor that died. I found a spare one from a broken LCD monitor however it shows 19V 1.7A. I checked the back of the TV and it says 19V 2.4A. Will the .7A difference result in the adaptor blowing up?

SaltyNZ

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#2309797 3-Sep-2019 09:36

Eventually, yes, it will fail. But it will probably fail immediately: that's about a 40% overload.

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TheMaskedOnion

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#2309799 3-Sep-2019 09:36

I personally wouldn't do it but it may work for a short term solution.

Have you checked that polarity matches the previous AC adapter?

CrashAndBurn

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#2309800 3-Sep-2019 09:40

TheMaskedOnion:

I personally wouldn't do it but it may work for a short term solution.

Have you checked that polarity matches the previous AC adapter?

Yes polarity is the same. It is only the ampere rating thats different.

CrashAndBurn

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#2309801 3-Sep-2019 09:41

SaltyNZ:

Eventually, yes, it will fail. But it will probably fail immediately: that's about a 40% overload.

I read somewhere that the rated ampere is the max it cango. However I am not sure if that only applies to the adaptor side or the TV itself. I have a feeling that the TV will always draw 2.4A

DonH

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#2309813 3-Sep-2019 09:45

That sort of power adapter usually shuts down when overloaded, rather than blowing up.
Most laptop power supplies are 19 volt and most are rated at more than 2.35 amps. Rummage in charity shops and "tip shops", or ask in shops that repair laptops. If you can't find a used one, many tech shops sell replacement supplies that come with an assortment of replaceable plugs.

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CrashAndBurn

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#2309818 3-Sep-2019 09:49

DonH:

That sort of power adapter usually shuts down when overloaded, rather than blowing up.
Most laptop power supplies are 19 volt and most are rated at more than 2.35 amps. Rummage in charity shops and "tip shops", or ask in shops that repair laptops. If you can't find a used one, many tech shops sell replacement supplies that come with an assortment of replaceable plugs.

I do have a few of the laptop ones but they are rated 19.5V and the plugs are different. My next option is to get a universal one. Just dont understand why LG still create monitors/tv that uses an adaptor instead of just the standard power plug like most manufacturers.

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Technofreak

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#2309820 3-Sep-2019 09:54

CrashAndBurn:

I do have a few of the laptop ones but they are rated 19.5V and the plugs are different. My next option is to get a universal one. Just dont understand why LG still create monitors/tv that uses an adaptor instead of just the standard power plug like most manufacturers.

I agree re the standard power plug. I guess it is easier/cheaper for them to make only one model of the TV and supply an adaptor that is compatible with the local reticulated power supply.

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SaltyNZ

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#2309821 3-Sep-2019 09:56

CrashAndBurn:

I do have a few of the laptop ones but they are rated 19.5V and the plugs are different. My next option is to get a universal one. Just dont understand why LG still create monitors/tv that uses an adaptor instead of just the standard power plug like most manufacturers.

Because everyone wants their TV to be super thin and super light, and because power supplies are the most common part to fail. If the power supply is external it's trivial to replace. If it's internal then the TV is RTB.

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CrashAndBurn

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#2309823 3-Sep-2019 09:58

Technofreak:

CrashAndBurn:

I do have a few of the laptop ones but they are rated 19.5V and the plugs are different. My next option is to get a universal one. Just dont understand why LG still create monitors/tv that uses an adaptor instead of just the standard power plug like most manufacturers.

I agree re the standard power plug. I guess it is easier/cheaper for them to make only one model of the TV and supply an adaptor that is compatible with the local reticulated power supply.

But all of the adaptors that they supply are auto-volts 100-240 50/60Hz.

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#2309861 3-Sep-2019 11:04

I do not recommend the following, and no doubt I will be jumped on for it, but I mention it for what it may or may not be worth: If you have multiple 19.5 volt laptop adapters as you say, and if you have two with identical outputs (voltage and current), you could always connect them in parallel and feed the TV from that. An extra half-volt shouldn't hurt anything.

Edit: The above doesn't actually apply here. For some reason I thought the problem was inadequate capacity of the laptop supplies. I misunderstood the issue but will let this stand for those who have already read it.

That aside, an extra half volt won't hurt anything. I would think you could just swap the connector onto one of the laptop supplies. It ought to work.

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