hello buddy: if you have the vertical lc at lc301-KA2131- change the C309 of 100mfx35v ... it is connected between pin4 and 8 of the vertical lc ... taking care of the original position ... also change the C306 of 1000mfx35v ... measure if 24v reach pin9 and 4 ... if it still does not fill the screen change the R304 1.5ohm x one of 1.2ohm x 2w ... the colored bands are (brown-red.-gold-gold) ... comment if it is the vertical lc KA2131 ... and comment results ,,, greetings !!