Is Heater Voltage (CRT PWB) about 6V? Yes Trouble in power supply circuit
No
Trouble in CRT
Yes Turn the Brightness & Contrast control to set Maximum Yes
Refer to trouble in power supply unit.
Is whole screen bright?
No
Trouble in power supply circuit
Yes Check G1 voltage about -65V? Yes Is CRT G2 (screen) voltage about 510V? Yes Is 75Vdc line normal? No Trouble in 75Vdc Refer to trouble line of power in P.S.U supply unit No
Trouble in G1 line of Main PWB
No
Trouble in FBT
Yes Does turning the Brightness control counterclockwise make screen bright? Yes Trouble in FBT
