This machine was transferred by a friend. Before the image was darkened, only one corner was seen in the later stage. When it was over, nothing was reflected.
Open cover repair, three-in-one board. Measure the LED supply voltage to normal 68V (with a lamp voltage of 49V after operation), to eliminate the AP3041 problem. IW7018 was measured, and it was found to be very hot. Although the working temperature is very high, the experience tells me that this temperature is a bit high. Continue to measure the voltage of 24V of LED1~LED8 of IW7018. The normal voltage should be around 1 volt (repair) The voltage of each foot is different from 1.2 to 2.3V. The voltage of IW7018EN is measured to be 2.1V lower. The 5V and 3.3V voltages sent out from pins 10 and 11 are not normal. They are all beating at 2.1V. The 12-pin VIN supply voltage is normal at 12V. The SPI signal is pulsed with an oscilloscope. Because IW7018 is very easy to break, bought 2, the test is normal. The temperature is significantly lower than before.
Here to emphasize, this machine 24V supply voltage, but the actual measurement is 38V. At first I thought the power problem, because it is impossible to be so high, so high protection. But the 12V voltage is very stable. Later, according to the circuit diagram, I ran a line and found that the 24V overvoltage protection regulator ZD952 did not, so I understand why it works.
Ok, let's install it... oh... oh... I have to smash, this problem has been met by a lot of masters, and there is no way to solve the dirty workbench. The capacitor's power is not completely released, and the solder strip is taken up. I am speechless. Patience repair, measuring 5V no, found RB959 power supply 2.7 ohm current limiting resistor is broken, measuring power chip power supply without short circuit, put on the resistor, 5V came out
Measuring PFC output 300V, PFC is not working, measuring FAN7930 power supply, 1V flashing, estimated short circuit, replaced with new, fault remains, halo, hell, then measure VCC-PFC output voltage is normal, measure RF910 When the problem arises, the 10 ohm resistor is broken, and the appearance is perfect and it is not good to see it. Put on a new one, this time the voltage is out! OK! I have been lighting the test so far. TV looks pretty good
An electronic clock device with a wireless network monitoring camera is characterized in that it comprises an electronic clock device body with a wireless network monitoring camera; the electronic clock device body with a wireless network monitoring camera is composed of a foot, a wireless transmission module, a It consists of a rechargeable battery, a speaker, a touch display screen, a camera, a casing, an infrared device, and a microprocessor; the feet are fixedly installed at the bottom of the rechargeable battery; a casing is fixedly installed on the top of the rechargeable battery, and the The interior is provided with a touch screen, a camera, an infrared device and a microprocessor; the microprocessor is electrically connected to the rechargeable battery through wires; the wireless transmission module, speaker, display, camera and infrared device are connected to the micro processor through wires The display screen is arranged at the bottom of the camera, and the camera is surrounded by an infrared device; the wireless transmission module is fixedly installed on both sides of the rechargeable battery, and the speakers are opened on both sides of the casing
Camera Watch,HD,HD1080
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