Sony KDS-R50XBR1 Training Manual page 67

Diagnostics and troubleshooting
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The next step is to confirm application of the AC voltage to the G-Board
through the F-Board (Main Fuse). Check for 110V AC at CN6014 on the
G-Board to confirm AC supply voltage. If the answer to the question
diamond is No (AC is not present at CN6014) then check all connections
between AC power cord and the F-board for loose connections or
damage. Check the main fuse (F6001) on the F-Board. If all connectors
and components are OK replace the F-Board.
If the answer to the question diamond is Yes (AC is present at CN6014),
then the next step is to check if the Standby 5V power supply is functioning
properly. Check for Standby 5V at CN6502 on G-Board (remove ASU-
Board shields to access CN6502). An alternative Standby 5V checkpoint
is at the Thermostat connector (or directly at the Thermostat) on the left
rear side of the TV (no need to remove any shields).
If the Standby 5V is present at the previously mentioned checkpoints
then the Standby 5V power supply is functioning, and there is a possible
microprocessor defect. In this case, replace the DSU-Board.
TVP-21
Is AC 110 V
Present
at CN 6014 ?
Yes
Is voltage
Yes
5V
Present?
Is voltage
5V
Present?
No
If the Standby 5V is not present at the checkpoints then the Standby 5V
power supply is not functioning. In this case, replace the G-board.
3. Power Supply System
64

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