AL1751 Service Guide
Page 6
...dangerous voltages and other hazards. Precautions Do not use the monitor near or over a radiator or heat register. To ensure reliable operation of power source indicated on the monitor. Do not place the monitor on a wall or shelf, use the monitor only with a third (grounding... the three-wire plug, have an electrician install the correct outlet, or use an adapter to qualified service personnel To ensure satisfactory operation, use a mounting kit approved by the manufacturer or sold with the attached power adapter (output 12V DC) which have UL, CSA listed license 6
...dangerous voltages and other hazards. Precautions Do not use the monitor near or over a radiator or heat register. To ensure reliable operation of power source indicated on the monitor. Do not place the monitor on a wall or shelf, use the monitor only with a third (grounding... the three-wire plug, have an electrician install the correct outlet, or use an adapter to qualified service personnel To ensure satisfactory operation, use a mounting kit approved by the manufacturer or sold with the attached power adapter (output 12V DC) which have UL, CSA listed license 6
AL1751 Service Guide
Page 8
... picture LOGO Chapter 2 Machine Disassembly Chapter 3 Troubleshooting Chapter 4 Connector Information Chapter 5 FRU (Field Replacement Unit) List Exploded Diagram Chapter 6 Schematic Diagram Top Power Input Scaler Panel interface Mpu Adapter Board Inverter Board 9 10 12 11 12 14 15 16 17 19 21 22 26 27 32 38 39 40 44 44 45...
... picture LOGO Chapter 2 Machine Disassembly Chapter 3 Troubleshooting Chapter 4 Connector Information Chapter 5 FRU (Field Replacement Unit) List Exploded Diagram Chapter 6 Schematic Diagram Top Power Input Scaler Panel interface Mpu Adapter Board Inverter Board 9 10 12 11 12 14 15 16 17 19 21 22 26 27 32 38 39 40 44 44 45...
AL1751 Service Guide
Page 14
CCFL Drive. The Inverter board will contain a main board (include: keypad board and audio board), an inverter board, adapter which house the flat panel control logic, brightness control logic and DDC. Flat Panel and CCFL backlight Inverter board Adapter AC-IN 100V-240V Main Board (Include: Audio board, keyboard) RS232 Connector For white balance adjustment in factory mode HOST Computer Video signal, DDC 14 Monitor Block Diagram The LCD MONITOR will drive the backlight of panel. The adapter will provide the 12V DC-power to inverter/power board and main board.
CCFL Drive. The Inverter board will contain a main board (include: keypad board and audio board), an inverter board, adapter which house the flat panel control logic, brightness control logic and DDC. Flat Panel and CCFL backlight Inverter board Adapter AC-IN 100V-240V Main Board (Include: Audio board, keyboard) RS232 Connector For white balance adjustment in factory mode HOST Computer Video signal, DDC 14 Monitor Block Diagram The LCD MONITOR will drive the backlight of panel. The adapter will provide the 12V DC-power to inverter/power board and main board.
AL1751 Service Guide
Page 32
Chapter 3 Troubleshooting This chapter provides troubleshooting information for the AL1751: 1. No power No power Press power key and look if the picture is normal NG Replace X402 OK Replace U402 NG Replace U401 32 NG OK Replace U702 NG X402 oscillate waveform is normal NG Measure 12V input voltage OK NG Check the adapter section Measure U702 PIN2=5V?
Chapter 3 Troubleshooting This chapter provides troubleshooting information for the AL1751: 1. No power No power Press power key and look if the picture is normal NG Replace X402 OK Replace U402 NG Replace U401 32 NG OK Replace U702 NG X402 oscillate waveform is normal NG Measure 12V input voltage OK NG Check the adapter section Measure U702 PIN2=5V?