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How to dim salvaged LED backlight (45v) with FET.
How to dim salvaged LED backlight (45v) with FET.
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Old 9th July 2018, 11:48 AM   #1
Formas is offline Formas  Jamaica
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Default How to dim salvaged LED backlight (45v) with FET?

Im trying to understand about dimming of the backlight in a lcd tv panel.... is there a simple dimming circuit utilizing a mosfet (pots, resistors, etc) that i can use to control dimming on a salvaged tv panel (45v B+ drive GND controls by LED IC) its 6 segments parallel with 14 leds in series per segment. can a dimming circuit be implement on the 45v B+ line? as i said ive just taken the inverter board and power it straight but i want to control the brightness (down) of the leds, i think its originally dimmed by the ground drive which is driven from the MP3388 IC to all 6 segments?

Last edited by Formas; 9th July 2018 at 01:21 PM. Reason: Title was in form of a statement, rather i need it as a question.
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Old 9th July 2018, 06:58 PM   #2
PRR is offline PRR  United States
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All is explained in the datasheet.
https://people.xiph.org/~xiphmont/thinkpad/MP3388.pdf

Simple manual control: Use a pot to put 0.2V (100%) to 1.2V (0%) on pin PWMO.
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