colleague: the diagram of the (LG-21FX4RB - MC-059A chassis) ... the ka431 is not listed as a source regulator ... it comes with the (error detector) lc805-SE-110N ... the voltage of + b must be in 110v ... there is no q, modify any resistance value ... in any case try changing the C814 of (220mfx160v) and the C826 of (1000mfx25v) ... and see if it regulates in 110v when giving power ... the voltage for the amplif, video is 180v at C540 q, it comes out of pin 2 of the fli-bak ... try changing it x one of 10mfx250v ... you must make sure if the change of the fli-bak is the replacement direct from the original ... if it is another scheme comment it ... greetings!