Service Manual
Page 3
...Feature...2-1 2-2 Specifications ...2-1 2-3 Option Specification ...2-2 3. Troubleshooting ...4-1 4-1 Common Acknowledge ...4-1 4-2 No Power & Power LED Off ...4-2 4-3 DC output voltage is unstable ...4-3 4-4 Output power is unstable ...4-4 4-5 Backlight can't be turned on ...4-5 4-6 Black Screen and backlight turn on ...4-6 4-7 White Screen ...4-7 4-8 Bad Screen ...4-8 5. Precautions ...1-1 1-1 Safety Precautions ...1-1 1-2 Servicing Precautions ...1-2 1-3 Electrostatically Sensitive Devices (ESD) Precautions 1-2 1-4 Installation Precautions ...1-3 2. Block Diagram ...7-1 7-1 Power...
...Feature...2-1 2-2 Specifications ...2-1 2-3 Option Specification ...2-2 3. Troubleshooting ...4-1 4-1 Common Acknowledge ...4-1 4-2 No Power & Power LED Off ...4-2 4-3 DC output voltage is unstable ...4-3 4-4 Output power is unstable ...4-4 4-5 Backlight can't be turned on ...4-5 4-6 Black Screen and backlight turn on ...4-6 4-7 White Screen ...4-7 4-8 Bad Screen ...4-8 5. Precautions ...1-1 1-1 Safety Precautions ...1-1 1-2 Servicing Precautions ...1-2 1-3 Electrostatically Sensitive Devices (ESD) Precautions 1-2 1-4 Installation Precautions ...1-3 2. Block Diagram ...7-1 7-1 Power...
Service Manual
Page 21
...'t be turned on No backlight Yes LED lamp is OK Yes Is there 14V voltage on pin 3,4 of T501, T502 Yes Is there PWM signal on pin 4 of IC501 Yes ...
...'t be turned on No backlight Yes LED lamp is OK Yes Is there 14V voltage on pin 3,4 of T501, T502 Yes Is there PWM signal on pin 4 of IC501 Yes ...
Service Manual
Page 22
4-5 Black Screen and backlight turn on Black Screen 4 Troubleshooting Check power supply: Pin1, 2 of CN102 Yes Check pin34, 51, 66, and 82 Of U105 Yes Check pin12, 68, 97 and 117 Of U103 Yes Check Reset (pin19) Of U103 Yes Check Crystal: Pin32, Pin33 Of U103 Yes Check CCFLEnable (pin20) of U103 No MCU Fail No Power Fail No Check FB103 And U102 No Check FB105 And U106 No Check C149, R157 No Check: X1, C147, C148 Yes Check pin5 of Yes CN102 Inverter Fail No Check R127, Q101, R125, R126 4-5
4-5 Black Screen and backlight turn on Black Screen 4 Troubleshooting Check power supply: Pin1, 2 of CN102 Yes Check pin34, 51, 66, and 82 Of U105 Yes Check pin12, 68, 97 and 117 Of U103 Yes Check Reset (pin19) Of U103 Yes Check Crystal: Pin32, Pin33 Of U103 Yes Check CCFLEnable (pin20) of U103 No MCU Fail No Power Fail No Check FB103 And U102 No Check FB105 And U106 No Check C149, R157 No Check: X1, C147, C148 Yes Check pin5 of Yes CN102 Inverter Fail No Check R127, Q101, R125, R126 4-5