Mitsubishi Electronics WS-55513, WS-65513 Chapter Troubleshooting Tips, Using The Front Panel LED

Page 73

Chapter 9

Troubleshooting Tips

LED Indications

Conditions

Probable Cause

Off

After AC is applied

No Standby Power or TV µPC not running

Fast Blink for 70 sec.

After AC is applied

Normal - DM µPC is booting up.

Fast Blink for 70 sec.

Each time TV is switched On

Power Save Mode is activated

Fast Blink (Doesn't stop)

After AC is applied

TV µPC is running, but DM failed to boot up

Slow Blink

Set is Off

Normal - Timer is set for Auto Turn On

 

Table 9-1: Power LED

Indications

Use the following tips when troubleshooting the source of a problem in the V23 chassis.

Using The Front Panel LED

The Front Panel LED helps isolate the cause of the following problems.

The TV will not turn On.

The TV turns On, and then Shuts Off.

If the TV will not turn On, the LED response indi- cates the possible cause of the problem. Table 9-1lists the possible LED response when this problem occurs.

When the TV turns On and then shuts Off, the LED Diagnostic Error codes help isolate the problem. This is the same LED Diagnostic featured on some previ- ous model TVs.

Figure 9-1shows the LED Error Code Activation Pro- cedure, an is describe in the following:

1)With the TV Off

2)Press and hold the front panel "MENU" and "DEVICE" buttons for 5 seconds.

3)The LED will flash the Error Code indicating what caused the TV to shut Off.

4)The Error Code will be repeated 5 times.

5)When the LED stops flashing the mode is automatically terminated.

Reading the Error Codes

The Error Codes are two digit numbers. The LED:

Flashes the value of the most significant digit (MSD).

Then there is a pause.

Flashes the value of the least significant digit (LSD).

The Error Code is repeated 5 times.

As an example, Figure 9-2illustrates the LED drive for Error Code "23". Table 9-2lists the Error Codes and their possible cause.

9-1

Image 73 Contents
V23 Page 2003 Page Disassembly and Service Table of Contents Introduction ... New TechnologiesAlignment Procedures Power SupplyVideo/Color Circuitry Troubleshooting TipsSync, Deflection and High Voltage Convergence CircuitryIntroduction FeaturesFeatures NetCommand Icons NetCommandButton Function Format Memory Card ReaderCompatibility PerfectColorDigital Visual Interface DVI MonitorLinkAcronyms Transition Minimized Differential Signaling TmdsDisplay Data Channel DDC Single-Link TmdsHot Plug Detect HPD High-bandwidth Digital Content Protection HdcpDVI Input Block Diagram MonitorLink DVI ConnectorV23 Chassis DVI Input Block Diagram Service Menu Access Codes Lightbox Chapter Disassembly and ServiceMain Chassis Removal DM ReplacementMain Chassis Removal PCB Locations PCB & Major Component Locations Convergence IC ReplacementV23+++ Composite Cabinet Back V23+++ Cabinet Front DisassemblyInitial Setup Chapter Alignment ProceduresOption Menu Initial Setup Main Menu Default Settings Activating the Circuit Adjustment Mode Circuit Adjustment ModeTerminating the Circuit Adjustment Mode Selection of adjustment Functions Adjustment ItemsNEW FEATURE… Service Mode Reset Saving Adjustment DataActivating the HD mode when no HD signal is available Convergence Adjustment ModeConvergence Mode Functions Alignment Data Storage Locations Fine Convergence ModeLow Energy Mode Chapter Power SupplyLow Energy Mode Activation Low Energy Standby RegulatorRegulation User Setup MenuLow Energy Power Distribution Start-up Standard Standby SupplyStandby Power Distribution Time Shift Recording Power SuppliesStandard Standby Supplies Time Shift Supply Power Distribution Switched Supplies Regulator Power Distributions TroubleshootingFlashes-Stops-Flashes-Stops-etc If the LED does not flash Page Basic µPC Requirements Chapter Control CircuitryReset Circuitry Input Command Circuitry Page ΜPC Parallel Inputs Serial Data LinesAC-OFF Input RAY Protect Short DetectBWC Band Width Control Parallel OutputsFlash Circuit Chapter Video/Color Circuitry PCB-TERMINAL Video Path PCB-SIGNAL Video Path CRT Drive & Protect Circuitry Digital Signal Path Monitor Out Circuit Chapter Sync, Deflection & High Voltage VGA Sync Signal PathPage Page Horizontal Deflection Vertical DeflectionHorizontal Deflection DC Supply Circuitry Deflection Loss Detection HV & HV Regulation Ray Protect Page Chapter Convergence Circuitry Convergence Circuitry Overall Block DiagramConvergence Waveform Generator & D/A Converter Waveform Generator & D/A ConverterLow Pass Filter and Summing Amplifiers LPF & Summing AmpsConvergence Output Circuitry Convergence Output Circuitry DTV DVI VGA Chapter Sound CircuitryOverall Sound Circuitry Block Diagram Digital Audio Output Overall Sound Signal PathPage Using The Front Panel LED Chapter Troubleshooting TipsReading the Error Codes DM Module Check NetCommandTM Control ProblemsCRT Phosphor Protection