JVC I'Art AV-27MF36 Installation guide

JVC Television
Power Supply Training

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INTRODUCTION
After this course, you will learn:
• The operation of Switching supplies
• Details about the regulator IC
• Operation of the Power Supply Modes
• The operation of the Power Factor Circuit
• Troubleshooting procedures useful in
diagnosing defective components
• Some failures and their symptoms
TELEVISION

AGENDA
• Model Identification
• Service Manual Supplements
• Switching Power Supply
• Power Supply Components
• Basic Switching
• Switching Device
• Switching Operation
• Switching Review
• Power Factor circuit
• Troubleshooting techniques
TELEVISION

TELEVISION MODEL IDENTIFICATION

• Prior to service, it is always wise to verify the Model and Version to
ensure that the correct Service manuals and Schematics are being used.
• In some cases, the Version may indicate PWB or CRT differences
• This information is listed in the Main Difference List of the Service
Manual, or the Service Manual Supplements. For example YA319 is
the service manual, but YA319B would be a revision.
• The Example shows that the AV-32MF36 has (4) versions. The
example shows the “Z” Version of this model.
• The Model Number listed at the top of the model label will always be
the same for all versions.
• The TV Model Version is usually shown to the right of the Serial
Number on the Model Label

SERVICE MANUAL SUPPLEMENTS
TELEVISION
Picture tube of AV-48P776/H was changed.
Therefore, this service manual describes only the items which differ from those of the AV-48P776/H service manual.
For details other than those described in this manual, please refer to the AV-48P776/H service manual
(No.YA318, 2005/11).
No. YA318B
2006/6
Supplements show Corrections, Additions and Differences
that may have occurred during the production of a TV Model.
Service Manual Supplement
Original Service Manual

• Some Service Manual have Supplements
• Supplements show Corrections, Additions and Differences
that may have occurred during the production of a TV
Model.
• It is necessary to ensure you have all Service Documents
for a model prior to servicing.
• The Original Manual will only show the original Service
Information for a model, but Service Manual Supplements
may list information that is important to the service of a
model.
• Ensure that you use the Model and Model Version when
looking for documents on ISee to ensure you are getting
the correct information.

SWITCHING POWER SUPPLY
TELEVISION
LIVE ISOLATED
When troubleshooting it is
necessary to use the
respective ground of the
device you are measuring.
Taken from Schematic 52004 Main PWB

• This is the Power Section from the AV-32F703 taken from the 52004
Schematic of the Main PWB.
• On the schematic, there a BLACK line that separates the LIVE and
ISOLATED sides of the PWB. Components on the left side are live.
Those on the right side are isolated
• When troubleshooting it is NECESSARY to use the respective ground,
Live or Isolated, of the device you are measuring.
• Additional components, located along the dotted line, ensure circuit
isolation while passing all Power or Control signals. These
components are the Relay, Switching Transformer, Photocoupler and
the Capacitors that are used to connect the Live and Isolated grounds.