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Electronics => Repair => Topic started by: bookaboo on March 08, 2017, 09:44:12 am

Title: LCD Backlight Inverter Board - Inline capacitors?
Post by: bookaboo on March 08, 2017, 09:44:12 am

I've been asked to repair a backlight inverter from an old Sharp LQ104V1LG81 LCD monitor. The units not worth much time but I figured it would be worth a shot replacing the blown cap. Unfortunatley the remaining "good" one is also blown open circuit so I cant get the value for this.

I'm no expert on backlight inverters and a general schematic search doesn't show anything for typical values. I've made a crude sketch of the blown part of the circuit. Anyone got any ideas what values I could try?

Title: Re: LCD Backlight Inverter Board - Inline capacitors?
Post by: bktemp on March 08, 2017, 10:21:08 am

Typical values are in 2 digit pF range. 15-50pF. 22pF and 33pF working voltage 2-3kV seems to be most common, but their value depends und CCFL tube voltage, current and actual inverter design.