Introduction: In recent years, with the development of science and technology and the improvement of people's living standards, plasma TVs have become one of the necessary household equipment for every household and are favored by many friends. But do you know how to check and repair a plasma TV if it malfunctions? This article mainly introduces how to repair a plasma TV.
Plasma TV faults and repair methods
Power-on problems
If the power does not turn on, first check the status of the power indicator light. If the indicator light is red, then there is nothing wrong. Question, just press the standby button to turn it on. If it does not light up at all, there is a problem with the power supply of the power board. If the display is blue, check the power supply, crystal and bus of U8. If there is a problem, replace the crystal and inspect the bus. If there is no problem, check the LVDS connection cable. If there is a problem, reconnect it. If there is a problem, check the FLASH. If there is a problem, upgrade or replace it. If there is no problem, check the LVDS driver board. If there is a problem, replace it with a new one. In this way, you can check out the problem step by step and solve it.
Image problem
If it can boot normally but there is no image or abnormal image, first check whether other channels are normal. If there is a problem, replace the LVDS circuit or PDP module. If there is no problem, the image will be displayed. Which input channel is faulty? Check the components in the input channel. If there is a problem, replace it. If there is no problem, it may be a TV signal problem. You can check the high-frequency circuit and U8, or wait until the signal is good and there will be no problem.
Sound problems
Sound problems are one of the most common problems with TVs. If there is no sound or low sound, there may be a problem with the speakers or headphones. If there is a problem with the headphones, check the LM833 If there is a problem with the speaker, replace it. If there is no problem, check the 30V power supply of R314. If there is a problem, check the 30V power supply circuit of the power board. If there is no problem, it is probably a mute circuit problem. Then check the mute circuit or check the audio excitation signal output.
The approximate board-level repair judgment for plasma faults
Refer to the fault flash table in the maintenance manual to see which board the fault is roughly located after the light flashes a few times.
1st time: It is usually a problem with the A board, voltage or data exchange error. The way to judge is to disconnect all the cables of the A board and see if it can be turned on. If it can be turned on, there is a problem with the A board.
Part 2: P board-D board 15V problem. The first situation is that the P board has no 15V output. The second situation is that the D board has a 15V short circuit or a 15V open circuit and does not receive power. The judgment method is to P board is individually repaired and tested (I have learned all the test methods) to see if the P board is normal, whether there is an abnormal P board problem or a normal D board problem.
6 times and 7 times: Generally, there is a problem between the SC board and the power supply. The quick way to judge is to disconnect the SC20 cable and see if it is turned on. If it is turned on, if there is a problem with the SC board, it will not turn on. Test the P board separately. Next, the P board is normal, but there is a problem with the SC?SU?SD?. Check whether the SU?SD?IC screen driver output is short-circuited to ground. If it is not short-circuited, there is a problem with the SC board. The SC board can also be repaired separately.
Step 8: Disconnect SS33 directly to see if it is turned on. If it is turned on, it is a SS problem. If it is not turned on, the P board must be repaired separately. If it is a normal SS problem, if the P board is abnormal, it is a P board problem.
10 times: Turn on the power and listen to the relay's closing and closing time. It will disconnect immediately when it closes. The P board detects the circuit or short circuit. If there is a problem with the P board, check it separately for confirmation. It is usually 15V or STB5V. Short circuit or no output.
Introduction to plasma TV
Plasma TV is an electrical appliance that can realize the function of a TV. But what is the difference between it and an ordinary TV? It turns out that a plasma TV has some special gases added between its two glass screens. Once the TV is connected to the power supply and some voltage is added, the voltage will The phosphor between the two glass screens emits light, enabling the TV function. However, compared with the modern development of LCD TVs, the two major types of TVs that once occupied the color TV market have become the standouts of LCD TVs. Plasma TVs have gradually withdrawn from the color TV market, but they are still There are some saving graces. Let's take Hisense plasma TV as an example. As a big brand, its quality and performance are guaranteed to a certain extent. However, any brand of TV will have some minor faults after being used for a long time. Below, let me tell you some common faults and repair methods.
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