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CRT versus LCD and OLED
A CRT forms an image by directing electron beams toward a phosphor screen. An LCD controls light passing through liquid-crystal pixels and commonly uses a backlight. OLED pixels emit light themselves.
These technologies have different functional blocks and failure modes. A dark screen does not identify a single failed part. Model-specific documentation is necessary even for external diagnostics.
Worked example
An LCD can have an image-processing issue or a backlight issue; these are different systems even when both produce a dark-looking display.
Try it yourself
Draw separate functional block diagrams for CRT and LCD displays using descriptions, not wiring instructions.
Check your understanding
Which display commonly requires a separate backlight?
LCD pixels modulate light; common LCD televisions use a separate backlight.
References and further reading
Lessons and examples are original introductory material. These references offer further study; their material is not included as a copied course.
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