According to the symptoms , if display is not normal, "day " shaped missing strokes or other symbols are not displayed . The reason may be the CPU ( 22 ) - ( 25 ) feet, ( 20 ) - ( 17 ) feet, ( 5 ) - ( 10 ) feet and ( 12 ) foot open welding , that display the corresponding pin open welding , Weld . Or R33 ~ R38 a larger resistance value ; Q8-Q12, Q15, Q16 breakdown of a tube open . However, the screen does not display the fault , the fault may be on the display at 6.4V power supply :KXvservice manual download site

( 1 ) 5.5v low voltage transformer secondary winding open welding , resulting in the output of non- 6.4V voltage. Display not working voltage . Spot welding with a soldering iron to the open welding J.KXvservice manual download site

(2) Dl, D2 resistance becomes larger ; C1 failure or leakage ; resistor R45 open or resistance becomes larger . Diode Dl, D2 resistance becomes larger ( normal is about 40n), pressure drop increases. + Bl output at the output voltage decreases, the screen can not be displayed. Capacitor C1 failure or leakage, so that the output of + Bl no output voltage or low voltage 6.4V lot. When measuring the capacitance Cl, multimeter pointer should be able to swing around , showing charge and discharge phenomena . Otherwise Cl damage. Resistors R45 open, measure the resistance with the table is infinite, so that the display can not be operating voltage. If its resistance increases, the low voltage input to the display , the display is also no display. Replace the damaged components that can be restored to normal.KXvservice manual download site