Mitsubishi Electronics WS-55513 manual PCB & Major Component Locations, Convergence IC Replacement

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PCB-DTV Tuner	DM	PCB-MLINK	PCB-Terminal	PCB-Signal
IR Learning	NetCommand	DVI Decoder	A/V Inputs	Control uPC
DM Interface	IEEE1394	RS-232C Interface	A/V Selection	Tuning
DTV Tuner	Card Viewer		3D-Y/C	VCJ
& Demodulator	OSD-Menus		NTSC Video	Convergence
Interface	Digital uPC Control		Decoders	Generator

PCB-Doubler	PCB-SVM		PCB-Power	PCB-Main	PCB-DBF
PIP-POP	Scan Velocity		Power Supplies	Horizontal Defl.	Dynamic
Picture Format	Modulation		Audio Amp.	Vertical Defl.	Beam
3:2 Pull Down	(Picture Edge		Convergence Amps.	High Voltage	Forming
Line Double	Enhancement)				(Corner Focus)
480i to 480p
		Table	1-1: PCB Functions

PCB & Major Component Locations

PCB and major component locations are shown in Figures 1-4 and 1-5.The major circuit functions performed on each PCB is listed in Table 1-1.

Convergence IC Replacement

To maximize cooling efficiency, the Convergence Amplifier ICs, IC8C01 & IC8C02, are mounted as close to the back cover vents as possible. With the heat sink fins over the top of the IC, access for re- placement is restricted. To simplify replacement use the following procedure to remove the heat sink.

1)Release the 2 spring clips from the rear (towards the front of the set) of the heat sink.

2)Remove the 3 mounting screws shown in Figure 1-6.

3)Remove the heat sink by gently prying the IC’s loose.

When reinstalling, please note:

•Overtightening the screws can strip the plastic threads in the chassis.

•Mounting clips should be firmly seated for proper heat transfer.

Figure 1-6: Convergence IC Removal

1-5

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Contents

V23 Page 2003 Page Power Supply Table of Contents Introduction ... New TechnologiesDisassembly and Service Alignment ProceduresConvergence Circuitry Troubleshooting TipsVideo/Color Circuitry Sync, Deflection and High VoltageIntroduction 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 DisassemblyOption Menu Initial Setup Chapter Alignment ProceduresInitial Setup Main Menu Default Settings Activating the Circuit Adjustment Mode Circuit Adjustment ModeSaving Adjustment Data Selection of adjustment Functions Adjustment ItemsTerminating the Circuit Adjustment Mode NEW FEATURE… Service Mode ResetConvergence Mode Functions Convergence Adjustment ModeActivating the HD mode when no HD signal is available Alignment Data Storage Locations Fine Convergence ModeLow Energy Standby Regulator Chapter Power SupplyLow Energy Mode Low Energy Mode ActivationRegulation User Setup MenuLow Energy Power Distribution Start-up Standard Standby SupplyStandard Standby Supplies Time Shift Recording Power SuppliesStandby Power Distribution Time Shift Supply Power Distribution Switched Supplies Regulator Flashes-Stops-Flashes-Stops-etc TroubleshootingPower Distributions If the LED does not flash Page Basic µPC Requirements Chapter Control CircuitryReset Circuitry Input Command Circuitry Page AC-OFF Input Serial Data LinesΜPC Parallel Inputs 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 CircuitryDTV DVI VGA Chapter Sound CircuitryOverall Sound Circuitry Block Diagram Digital Audio Output Overall Sound Signal PathPage Reading the Error Codes Chapter Troubleshooting TipsUsing The Front Panel LED CRT Phosphor Protection NetCommandTM Control ProblemsDM Module Check