Panasonic TH-42PV500B - Aspect Ratio Controls; Detailed Aspect Ratio Modes (Zoom Options); Using the Still Picture Function

8.4. Local screen failure
Plasma display may have local area failure on the screen. Fig-1 is the possible defect P.C.B. for each local area.
Fig-1
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TH-42PV500E / TH-42PV500B / TH-37PV500E / TH-37PV500B