After many years of service this unit now refuses to turn on and gives a once per second continuous blinking power indicator. Service manual indicates this is a "lamp failure".
If I force the power on with Channel down and volume up buttons I measure correct power supply voltages at the main board. The Power supply to the inverters (connector LA) measure 10V and 47.3V which I don't have a value for from the manual but appears should be 24V. LB connector which I guess are control voltages to inverter measure 3.3V, 3.1V, 0V, and 0V at contacts 1, 2, 3, and 4 respectivly.
I looked for open circuits at the inverter output transformers but all seem normal.
At this point I am stumped as to where to look next and any help from members of this forum would be greatly appreciated.
Thanks in advance
Ron
If I force the power on with Channel down and volume up buttons I measure correct power supply voltages at the main board. The Power supply to the inverters (connector LA) measure 10V and 47.3V which I don't have a value for from the manual but appears should be 24V. LB connector which I guess are control voltages to inverter measure 3.3V, 3.1V, 0V, and 0V at contacts 1, 2, 3, and 4 respectivly.
I looked for open circuits at the inverter output transformers but all seem normal.
At this point I am stumped as to where to look next and any help from members of this forum would be greatly appreciated.
Thanks in advance
Ron
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