Could A 15″ LCD Monitor Drive A 19″ Backlight?
There was a 19″ HP LCD Monitor came in for repair and the complaint was display shutdown after “On” for few seconds. From my experience, there are many cases of display shutdown due to defective a backlight. In order for me to confirm whether the backlights are good or not or if it the soucrce of the shutdown problem, i used a 15″ LCD Monitor to test it out since both of the LCD Monitor have the same type of backlight connector.
I removed the good working 15″ LCD Monitor backlight connector and use the 19″ LCD Monitor backlight connector to plug it in into the 15″ LCD inverter board. Guess what happen? The display works good and there is no flicker in the 19″ LCD display. I tested on both the top (2 backlights) and the bottom (2 backlights) and the 15″ LCD Monitor didn’t shutdown. This proof the 19″ LCD Monitor backlights have no problem and the display shutdown could be in the inverter board itself. It could be a defective inverter IC or surrounding components.
Although the 19″ LCD Monitor have display after plugged into the 15″ LCD Monitor inverter, the display was not that bright. This mainly due to the output ac voltage from the 15″ LCD inverter was not high enough to drive the 19″ backlight. Hope this repair tips can helps you in your LCD Monitor repair.