the oscillator drive to the FET. The PWM is automati- cally changed to maintain a constant 110V source.
Five supplies are directly generated by signal from T9A50, 210V, 110V, 17V, +24V and
Power Distributions
Figure 3-10 shows the Switched Supplies Power Dis- tribution. The 110V supplies power to DBF, Horizon- tal Drive, HV and SVM circuitry.
The +24 source supplies power to the Vertical Output, X-Protect and Convergence circuitry. It also generates the 12V-MAIN supply that is dedicated to HV Drive and Deflection Loss circuitry.
The -24V supply is used in the Convergence circuitry, and is the source for the -20V supply used in the CRT Drive circuitry. The 210V supply is also used in the CRT Drive circuits.
Troubleshooting
The most common symptom due to Power Supply prob- lems is "The TV Will Not Turn On". The Flow Chart in Figure
If the LED flashes:
•For 1 minute before the TV turns On: This is normal, it takes about 1 minute for the circuitry to Boot Up. Boot Up occurs the first time the TV is plugged, and if in the Low Energy mode when the Power button is pressed.
•Flashes Continuously
It indicates the TV µPC is not functioning.
• Flashes-Stops-Flashes-Stops-etc.
It indicates a loss of communication between the TV µPC and the DM µPC.