LOW B+ ERROR [6X] FLASH PATTERN [6 blinks of standby light prior to shut-down}
In most cases, a defect in the Power Supply Output (G-Board) causes this error, particularly, a missing Sub 11V output. However, theoretically a defective TV microprocessor output can also cause this error, and therefore, consider this component when troubleshooting.
Firstly, eliminate the TV microprocessor as suspected for failure. Check for the presence of the AC Relay voltage at CN6502/pin-31 on the G-Board. This is the switched voltage from the TV microprocessor to turn On the Main AC relay and in turn main Power Supply. The AC relay voltage should switch to (4.8V) immediately after the Power On button is pressed.
If the AC relay voltage is missing, this indicates a failure in the TV microprocessor circuit on the ASU-Board, therefore, replace the ASU | DSU assembly.
If AC relay is present the next step is to verify the Sub-11V, and regulated 5V main Power Supply Outputs.
Check the Sub-11V at CN6502/pins 9 through pin 15.
Check for regulated 5V at CN6502/pin-6.
At this point in the process the AC power is applied and AC relay voltage has been received, and therefore, all Main Power Supply Secondary Voltages should be present. If the Sub-11V and / or regulated 5V is missing, the Main Power Supply Board is defective, and the G-Board must be replaced.
If the Sub-11V and regulated 5V are present and the unit still shut down, and show 6 blinks of standby/power LED, then the defect is on the ASU-Board. The most likely suspect for failure is the D5V regulator on the ASU-board. In this case, replace the ASU/DSU assembly.
