Patent ID: 8717191

Claim:
An indication circuit used on a motherboard, first and second pins on the motherboard output different signals corresponding to different errors when the motherboard is performing power-on self-test, the indication circuit comprising: first to third electronic switches, wherein a control terminal of the first electronic switch is connected to the first pin on the motherboard, the control terminal of the first electronic switch is further connected to a first power supply through a first resistor, a first terminal of the first electronic switch is grounded, a second terminal of the first electronic switch is connected to the first power supply through a second resistor, a control terminal of the second electronic switch is connected to the second terminal of the first electronic switch, a first terminal of the second electronic switch is grounded, a second terminal of the second electronic switch is connected to a second power supply through a third resistor, a control terminal of the third electronic switch is connected to the second pin on the motherboard, the control terminal of the third electronic switch is further connected to the first power supply through a fourth resistor, a first terminal of the third electronic switch is grounded, a second terminal of the third electronic switch is connected to the second power supply through a fifth resistor; and first and second light-emitting diodes (LEDs), wherein a cathode of the first LED and an anode of the second LED are connected to the second terminal of the second electronic switch, an anode of the first LED and a cathode of the second LED are connected to the second terminal of the third electronic switch; wherein when the control terminal of the first electronic switch receives a high level signal from the first pin on the motherboard, the first electronic switch is turned on, and the second electronic switch is turned off; when the control terminal of the first electronic switch receives a low level from the first pin on the motherboard, the first electronic switch is turned off, and the second electronic switch is turned on; when the control terminal of the third electronic switch receives a high level signal from the second pin on the motherboard, the third electronic switch is turned on; when the control terminal of the third electronic switch receives a low level signal from the second pin on the motherboard, the third electronic switch is turned off.