Troubleshooting Flowchart Step Descriptions - Sony KDS-R50XBR1 Training Manual

Troubleshooting Flowchart Step Descriptions

Reference Flowchart B, Figure 3-3
When troubleshooting a "Unit will not turn ON" problem in previous
models the Red Power/Standby LED on the front panel, when illuminated,
would indicate that at least the Standby 5V power was functioning.
Unfortunately, there is no red standby LED on either of the two 2005
SXRD models (KDS-R50XBR1 and KDS-R60XBR1). Therefore, the only
way to visually check if the Standby 5V circuit is functioning is to press
the ON/OFF power button and watching for the Green Power/Standby
LED on the front panel to begin flashing.
Does GREEN
The first decision diamond in Flowchart B asks the question – does the
Green (Power/Standby) LED begin flashing? If the answer is yes then
you know that the Standby 5V and the TV Microprocessor are functioning
(the TV Microprocessor controls the Green LED).
The next step is to check if the Green (Power/Standby) LED Glows
Steady Green, Continuously Flashes, or if the Red Protection LED
begins flashing.
If the Green (Power/Standby) LED glows steady then the Power-On
sequence was successfully completed, and the power supply system and
microprocessor communications are working fine. If there is still no video
displayed or audio heard then your troubleshooting efforts should be turn
TVP-21
Yes
LED Begin
Flashing?
What is the
State of the
Green LED ?
to solving a video, audio, or lamp section defect.
If the Green (Power/Standby) LED flashes continuously then there is a
communications problem between the microprocessors. In most cases, it
will be a communications problem between the TV microprocessor on the
DSU-Board and the ATI microprocessor in the Q-Box module. Confirm
that all cables and connectors between the DSU-Board and the Q-Box
module are securely seated and undamaged. If all connections are good
then the most likely defect suspect is the Q-Box module. The fact that
the unit successfully completes the power-on sequence indicates that the
TV microprocessor is functioning properly.
If the Red (Power/Standby) LED begins flashing then the DE
microprocessor has detected a system failure and has placed the unit in
protection mode. The Red (Power/Standby) LED flash sequence (number
of flashes between pauses) should be noted an proceed the indicated
Protection Mode troubleshooting flowchart(s).
Let us go back one-step in the flowchart and follow the path for the
situation when the Green (Power/Standby) LED does not begin flashing
after the unit receives an ON command.
The first step in troubleshooting a no Green (Power/Standby) LED
symptom is to confirm that the TV is securely plugged into a active AC
outlet.
3. Power Supply System
Does GREEN
LED Begin
Flashing?
No
Is AC 110 V
No
Present
at CN 6014 ?
63