Troubleshooting Flowchart Step Descriptions - Sony KDS-50A2000 Training Manual

Troubleshooting Flowchart Step Descriptions

Reference Figures 7-1 & 7-2
Missing or Distorted
(Speaker Outputs)
The first step when a "Missing or Distorted Audio" defect occurs is to
determine if audio is missing on all audio input sources, or if there is
missing audio only on one or two video input sources.
Missing or Distorted
on All Inputs ?
1,2, ---,i-Link.
If the answer to this question is "No", meaning that only one or two input
sources are experiencing a problem, then the individual inputs must be
check separately. The external devices and their associated cables
connected to the faulty input should be check first.
External Devices
Swap Devices and
Substitute (or Swap) known good devices and cables on the faulty
input. Connect the device and cable at separate times to determine if the
TVP-23
Audio
Is Audio
No
Yes
Check
Bad
and
Connections
connections
Good
device or cables are causing the problem. Obviously, you must replace
the device or cabling if found to be defective (or Bad). However, if the
external device and cables are OK, then the next step is to replace the
unique board or module associated with that particular input source.
For example, consider the symptom of all or only one or two the Video 1,
2, 3, 4, 5, 8, and NTSC inputs are faulty. Logically the only device that
could cause this symptom is the switcher IC9602 on the A1-Board. The
most likely problem is one or more the switcher inputs are defective. In
this case, replace the A1-Board.
Another example would be missing or distorted audio on the HDMI (video
8) input only. The only board that would affect only the HDMI audio input
is the B1-Board (HDMI Receiver Circuit). Therefore, replacing the B1-
Board should fix this problem.
Missing or Distorted
Let's go back to the first question diamond in the flowchart and consider
how to solve an audio problem if the answer is "Yes", meaning, that all
the audio input sources are missing or distorted.
Check for audio at the Audio Output Var/Fix to isolate the problem to either
the DSP or Power Amplifier Circuit on the A1-Board & the Speakers. The
audio system is divided in half when accessing this checkpoint (Audio
Output Var/Fix).
7. Audio Processing System
Check
Individual
Audio Inputs
Is Audio
No
on All Inputs ?
1,2, ---,i-Link.
Yes
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