Samsung is an old brand in the electronics industry. Many people are very interested in it. But it is not that Samsung's LCD TV will not fail, and its LCD screen will also appear to be a little problem from time to time. All Samsung engineers believe that there are no bad machines in the world. Today, Xiao Bian, I will take stock of several common faults and solutions for Samsung LCD screens.
1, no power
Non-failure check items: Check if the power cord is connected properly.
2, the power is on, does not work
Non-failure check items: Is the remote control battery a bit? Is the remote control working?
Note: How to determine whether the backlight is lit?
Method 1: Turn on the back cover to see the backlight.
Method 2: Please check the LCD screen and check if there is white light.
3, there is backlight, no image non-failure check items: check whether the signal is bad or signal line? Use a DVD test to replace the signal line test.
4, show horizontal / vertical line
Non-failure check items: Check for bad signal? Use a DVD test.
5, intermittent no image
Non-failure check items: Check the power cord for poor contact.
6, automatic shutdown non-failure check items: Check the power cord is bad.
7, the screen is dim non-failure check items: check whether the signal is bad or signal line? Use a DVD test to replace the signal line test.
8, poor picture quality
Non-failure check items: Check for bad signals or signal lines? Use DVD test, replace set-top box, signal line test.
9, no sound
Non-failure check items: Check for bad signals or signal lines? Use DVD test, replace set-top box, signal line test.
10, failure: not lighting, insurance intact.
According to the fault phenomenon, the basic judgment of the fault scope in the OZ964 and its peripheral circuits, the first measurement OZ964, 5 feet power supply, found that the voltage is very low is almost zero, check the circuit along the 5 feet, the discovery is provided by the U478M05. Q1 emitter 20V Normal collector No voltage output Q8 Collector 0.2V Description Q8 has been turned on, the backlight board control level has been sent to the Q8 base fault component Q1R39R38R16 check Q1 open circuit, replace a PNP type current is greater than 100MA transistor after boot, found U4 burst, indicating that the load current is too large or its own damage, measured U4 output pin to ground resistance of about 500 ohms, no short circuit, the new U4 rear lamp finally lit.