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== Preliminary Checks and Power Supply Basics == Before detailed troubleshooting, verify: * Power cord is securely connected * Wall outlet is functional (test with another device) * Voltage selector (if present) is set correctly for your region * No visible damage to power cord or connectors The Macintosh TV uses a universal power supply (90V-264V AC, 47-63 Hz) and does not require manual voltage selection in most configurations. '''Internal voltage specifications:''' * +5V rail: 4.85V - 5.15V * +12V rail: 11.9V - 12.7V
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