JVC I'Art AV-27MF36 Guide d'installation

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.

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