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Constant Current or Constant Voltage (LED TV)
Constant Current or Constant Voltage (LED TV)
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Old 11th June 2020, 10:46 PM   #1
Formas is offline Formas  Jamaica
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Join Date: May 2008
Location: Montego Bay
Default Constant Current or Constant Voltage (LED TV)

Guys, does anyone thinks running a tv backlight less that the supply ratings on current or voltage?
How does one limit the current on the Chinese design (universal TV boards) or slight mod (fixed or trimpot) to adjust the volts under the rating thatís designed for the led boost circuit?
Reason is I keep blowing led when I replace them, the keep failing even the original ones thatís on the strip. I guess I want to lower the current or the voltage or both.
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Old 11th June 2020, 10:50 PM   #2
rayma is offline rayma  United States
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Perhaps your AC line voltage is too high, monitor it for about a week and see.
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Old 12th June 2020, 02:38 AM   #3
Formas is offline Formas  Jamaica
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No, that’s not high, the normal operating voltage ranges from 85vac to 225vac that means the active power supply is regulated. I just want to know hardware wise how to limit the current or limit the voltage or reducing to prolong the life of the led array.
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Old 12th June 2020, 02:56 AM   #4
rayma is offline rayma  United States
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Can the brightness be lowered with the TV's set-up controls?
I've never had a problem like this with any TV.
The LEDs would be driven with variable DC current, not voltage.

Last edited by rayma; 12th June 2020 at 02:59 AM.
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Old 12th June 2020, 03:29 AM   #5
Formas is offline Formas  Jamaica
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Practically it could, but if I’m not using the service mode to reduce brightness, then the user can just brighten it again thru the normal menus.
Just want to know how to step down the voltage or decrease the current so the led aren’t near their max operating specs.
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Old 12th June 2020, 05:20 AM   #6
thimios is offline thimios  Greece
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Join Date: Aug 2009
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I think that the led quality is the worse!
I see a year old t.v led to fail when other set live for 10 or 15 years!
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