Vertical lines: Bad tab bonds, TCON ribbons, or TCON. TCON is being included as a bonus! Lights up but no display: main board, TCON, and/or panel. "Ghosting", fluctuating picture: TCON or panel. Turns on and screen blinks: Power board and/or sustain boards (Plasma TV), inverter (LCD TV), LEDs (LED TV), CCFL bulbs.
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