Detail Description Of The Steps In The Initial Contact Flowchart - Sony KDS-50A2000 Training Manual

Detail description of the steps in the Initial
Contact Flowchart
The Initial Contact Analysis flowchart is a high-level diagnostic tool
designed to quickly locate the general area of the failure, and the specific
procedures (flowcharts) to troubleshooting and resolve the problem. The
flowchart asks the following five general questions, in the sequence
shown, to take you from an overall power supply fault to a specific
power supply, video, or audio fault.
1) Does the Green Power LED Turn On?
2) Is the Red Power LED Flashing?
3) Is Video Present?
4) Is the Video Distorted?
5) Is Audio Present?
Let us briefly discuss the logic behind each of these questions.
Does
Green LED
Turn ON?
Does the Green Power LED Turn-On? This question will determine if
there is a power supply problem. The basic idea is does the unit turn on
and stay on. The 2006 SXRD models do not have a Red Standby/Timer
TVP-23
Start
Initial Analysis
No
Yes
LED, as was the case on previous models. The Red Power/Standby LED
was a good indicator of a properly functioning Standby 5V power supply.
The Standby 5V is active as long as the unit is plugged into the AC outlet,
and the Red Power/Standby LED glow. However, in the absents of the
Red Power/Standby LED the Green Power/Standby LED is the next best
indicator of a proper functioning Standby 5V power supply.
If the Green Power LED does not begin to flash after the "ON" button
is pressed then you are directed to the "Power-On Troubleshooting
Flowchart B" to troubleshoot a power supply failure.
Does
"Power" LED
Continously Flash
Green?
Does Power LED Continously Flash Green? The TV microprocessor
receives the ON command and begins the power up sequence. The
first step in the sequence is a attempt to communicate with the ATI
microprocessor on the QM-Board. If the communications between these
two microprocessors then the Power LED will continously flash green,
which indicates the continous attempts by the TV mocroprocessor to
communicate with the ATI microprocessor.
The factor that the Power LED begins flashing indicates that the TV
microprocessor is mostly likely OK and the failed component is the ATI-
Microprocessor or the supply voltage to the QM-Board. However, there
is a remote possibility that the TV microprocessor has partially failed,
therefore, the A1-Board is included as a secondary failure component.
3. Initial Contact Analysis
Replace
QM-Board
A-1205-237-A
Replace
A1-Board
A-1205-146-A (50")
A-1205-145-A (55")
A-1205-144-A (60")
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