Do you have a question about the Sony KDL-55W790B and is the answer not in the manual?
Servicing instructions for qualified personnel only; avoid electric shock and use isolation transformer.
Critical safety components must be replaced with specified Sony part numbers.
Component level repair of Power Supply and Inverter Boards is prohibited for safety.
Replace lithium batteries with identical/equivalent type to prevent explosion risk.
Perform checks for soldering, wiring, insulation, and components before customer release.
Check AC leakage from exposed metal parts to ground, limit 0.5 mA.
Verify earth ground using outlet box retaining screw and a test lamp.
Details TV system, channel coverage, panel system, speaker output, and wireless technology.
Lists and describes various input/output ports like HDMI, USB, LAN, and AUDIO.
Provides technical specs for models including power, dimensions, resolution.
Lists standard accessories included with the TV, such as remote, batteries, and cables.
Lists optional accessories like remote controls, 3D glasses, and wireless subwoofers.
Diagram showing placement of key boards: LD, TUS, Main, Smart Core, Switch Unit.
Exploded view of Smart Core Block: BT Module, HSC2 Board, Wireless LAN Card.
Illustrates internal wiring and cable management within the TV.
Further illustration or detail of the Smart Core Block assembly.
Steps to diagnose TV issues: verify symptom, check software, determine part.
Accessing the Self Check screen to view error history and count.
Chart to identify likely defective parts based on symptoms and blinking LED sequences.
High-level block diagram showing interconnections between Main Board, Tuner Board, Smart Core, and LCD Panel.
Detailed block diagram showing power and control signal flow between LD Board and Main Board.
Flowchart to diagnose and resolve 'No Power' issues, checking AC Adaptor and STBY voltage.
Flowchart to diagnose issues based on standby LED blinking patterns (2X, 3X, etc.).
Flowchart to troubleshoot video distortion, checking for lines, colors, and screen issues.
Flowchart to diagnose and resolve 3D viewing problems, checking remote and glasses.
Steps for repairing the TV: verify symptom, replace part, update software, perform adjustments.
Procedure for safely removing the TV's rear cover, including screw and hook release.
Step-by-step guide for replacing the Main Board or Tuner Board, including software update.
Procedure to update Model Name and Destination Data via Service Mode.
Procedure to update the TV's Serial Number via Service Mode.
Procedure to update the Variable Type setting in Service Mode.
Verifying Main Board and Tuner Board replacement results in Service Mode.
Steps to clear error history and exit Service Mode/Self Check Mode.
Procedure for disconnecting and removing the TV speakers.
Procedure for replacing the TV's Switch Unit.
Step-by-step guide to remove the Smart Core Block assembly from the TV.
Exploded view and part numbers for the table top stand assembly.
Exploded view and part numbers for chassis components like rear cover, power cord, AC adaptor, switch unit.
Exploded view and part numbers for Smart Core Block components: front/back covers, BT module, HSC2 board.
Exploded view and part numbers for internal connectors and harness assemblies.
List of screw types, their P/N, and usage for different TV components.
Lists screws, manuals, and 3D glasses kits included with the TV.
Lists optional accessories like support belt kit and remote commander.
Lists miscellaneous items such as stoppers, tapes, and safety flyers.
Instructions for handling, replacing, and destroying circuit boards with encryption key components.












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