Acer AT2245 Service Manual

The Acer AT2245 LCD TV Panel supports a resolution of 1680 x 1050 WSXGA+ (16:10 wide screen) mode.

The Acer AT2245 LCD TV Panel uses a 30-pin 2ch-LVDS (Low Voltage Differential Signaling) interface.

If your Acer AT2245 monitor displays no picture and the LED is orange, first check the keyboard/IR board. If that is okay, check the IC971 power supply circuit. If the 24V power supply is okay, check the main board standby power supply. If U902 is okay, check U401. If U401 is okay, check the I2C communication and I2C bus.

If the main board standby power supply is not okay, you should check U902 and U401. If U902 is okay, check U401. If U401 is okay, check the I2C communication and I2C bus.

First, check the voltage at CN902 pin10 and pin11 to ensure it is 12V. Then, verify the AC line voltage to ensure it is either 110V or 220V. If the voltage is correct, proceed to check the AC input and the voltage of C905 (+). If the voltage is not correct, check the bridge rectified circuit and F901 circuit. If the start voltage for the pin8 of IC901 is not correct, check R904, R905 and consider changing IC901. Additionally, ensure the auxiliary voltage is between 10V and 20V. If the issue persists, check IC901, D902, C908, and the IC902 OVP circuit. Finally, verify the PWM wave at IC901 pin5 and check components T901, Q903, D906, D904, D912, ZD920, ZD902, and IC903.

If the auxiliary voltage is not within the specified range, you should check IC901, D902, and C908. Additionally, verify the IC902 OVP circuit. If the issue persists, check the PWM wave at IC901 pin5 and ensure that components T901, Q903, D906, D904, D912, ZD920, ZD902, and IC903 are functioning correctly.

The 'TUNER_CVBS' and 'AS_IF' components are part of the tuner section of the Acer AT2245. They are likely involved in processing the composite video and audio signals from the tuner. The 'TUNER_CVBS' is connected to various resistors and capacitors, suggesting it handles the composite video signal, while 'AS_IF' might be related to the intermediate frequency (IF) signal processing.

The 'SDA' (Serial Data) and 'SCL' (Serial Clock) lines are part of the I2C (Inter-Integrated Circuit) bus, which is used for communication between the tuner and other components. These lines are essential for data transfer and control signals within the device, enabling various components to communicate and synchronize their operations.

The component labeled 'R918' is a resistor with a value of 100R and a power rating of 1/4W. Its specific function would depend on its placement in the circuit, but generally, resistors are used to control current flow and voltage levels in electronic circuits.

The component labeled 'C905' is a capacitor with a value of 120uF and a voltage rating of 450VAC. Capacitors are typically used for filtering, decoupling, and energy storage in electronic circuits. In this context, it likely serves to smooth out voltage fluctuations and provide stable power to the circuit.