Display device and method for checking display device

A method for checking a display device that includes:

• a display panel;
• a main wiring board;
• a first wiring board that includes a first feedback line;
• and
• a first cable that removably connects the main wiring board and the first wiring board,
• the main wiring board including:
• a first output line;
• a first input line;
• a first circuit that outputs a first voltage to the first output line;
• and
• a control circuit that is connected with the first input line,
• the first cable including:
• a first forward conductor that directly or indirectly connects the first output line and the first feedback line;
• and
• a first return conductor that directly or indirectly connects the first input line and the first feedback line,
• the method comprising:
• outputting the first voltage by the first circuit;
• determining whether the first voltage is input to the control circuit;
• and
• starting a display on the display panel, when an input of the first voltage to the control circuit is determined.