2009 FALL LCD DV 42LH50
7
Safety and Handling Regulations
1. Approximately 20 minute pre-run time is required before any adjustments are performed.
2. Voltage levels on SMPS are factory adjusted and sealed. VR301 and VR302.
3. Be cautious of electric shock from the Backlight section, it uses high voltage AC. Check
that the Power Supply and Drive Circuits are completely discharged because of residual
current stored before Circuit Board removal.
4. C-MOS circuits are sensitive to static electricity, use caution when dealing with Circuit
boards. Always handle the circuit boards on the outside edges, while wearing a static wrist
strap.
5. Exercise care when making voltage and waveform checks to prevent damaging the unit
and service equipment.
6. Be cautious of lost screws and other metal objects to prevent a possible short in the
circuitry.
1. Check the appearance of the Replacement Panel and Circuit Boards for both physical
damage and part number accuracy.
2. Check the model label. Verify model names and board model matches.
3. Check details of defective condition and history. Example: Oscillator failure dead set, etc…
Checking Points to be Considered
LCD DIRECT VIEW OVERVIEW
LCD DIRECT VIEW OVERVIEW
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