The machine fault, no images of frames on public channel, audio channel, scanning circuit, power circuit are working properly. Failure on the luminance channel. The main reason is: the isolation resistance R301, brightness delay line L301, coupling capacitance C301 open, repair switch S301 poor contact, etc. 5DJservice manual download site
(1) from IC301 (1) the foot into the human body induction signal, screen mesh, explain IG30l working properly. 5DJservice manual download site
(2) the brightness after the delay line into the human body induction signal, there is still a mesh screen interference, explain C301, S301 is normal. 5DJservice manual download site
Brightness (2) delay line before the injection of the human body induction signal, the screen no response, prove L301 is open, in after L301 returned to normal.5DJservice manual download site