Troubleshooting Flowchart Step Descriptions; No Video - Sony KDS-R50XBR1 Training Manual

Troubleshooting Flowchart Step Descriptions

When a video problem occurs you will experience one of the two following
symptoms.
•

No Video

• Distorted Video
The main objective when troubleshooting one of the previously listed
symptoms is to determine if the defective exists in the Optical Block,
ASU/DSU Assembly, or Power Supply System.
troubleshooting flowcharts have been designed to effectively and
efficiently locate the defective component using mostly visual indicators
and symptoms. The three flowcharts are as follows.
• No Video Troubleshooting Flowchart D
• Video Distortion Troubleshooting Flowchart E
• Optical Block Troubleshooting Flowchart F
No Video
The first step when a "No Video" defect occurs is to determine if video is
missing on all video input sources, or if there is missing video only on one
or two video input sources.
TVP-21
The three following
No Video
Is Video Missing
on All Inputs ?
If the video is missing only on one or two inputs then you will go to the
"Video Distortion" troubleshooting flowchart E, which will be discussed in
the next flowchart description. However, if there is no video on all video
input sources the next question to ask is, is the Red LED flashing. In
other words, is the unit shutting down and going into protection mode.
If the Red LED is flashing, this means that a protection circuit has detected
an error and the DE microprocessor is shutting the unit OFF and placing
it into a particular protection mode. In this case, you should go to one of
the Protection Mode troubleshooting flowcharts (C1, C2, or C3) found in
the Chapter 4. Observe the Red LED flash pattern (e.g. 2X) and proceed
to that particular flowchart.
If the Red LED is not flashing the next step is to check if any OSD's can
be displayed
5. Video Processing System
No
1,2,3 etc.
Yes
Yes
Is RED LED
Flashing?
No
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