I am not going to write this article, you can see (TV cooling maintenance technology) after the hegemony, think about it or write it out (I don't want to write because the maintenance of two cases of this model did not take pictures, did not think so much) .
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It’s not a rush to win a prize. It’s just a technical exchange. If there are similarities, please forgive me! I saw that the forum friends mentioned that the LG plastic screen has interference lines, and the black screen is turned on for a few seconds (similar to the backlight protection, the black screen is not black, but it is especially dark). Sometimes the image flickers and flies, sometimes the upper image of the screen is normal, and the lower black screen is faulty. When the above fault occurs, the backlight is normal and the sound is normal. The friend's solution for the forum is to scrub the screen line with gold fingers, use the foil paper to cover the screen line, pack the logic board, and pack the back plastic case. Some interference can be solved. If the interference is serious, the tin foil paper package may not be solved. To be honest, they did not find the real cause of the interference source. The two repaired Haixin machines are used to illustrate the solution.
Model: Hisense LCD TV TLM32H78 (0000)
Screen model: LC320WXE (SB) (V2) (LG plastic screen)
Power board: RSAG7.820.1731/ROH (two in one board)
Digital version: RSAG7.820.4143/ROH
Case 1: Booting has Hisense boot screen, black screen after about 3 seconds (screen is dark, backlight is bright, there is sound)
Maintenance time: March 2016, hotel room machine, purchase four years, the hotel called the 32-inch Hisense TV is broken, there is sound, black screen, after the boot to observe 3 seconds after the black screen, sound is normal, fine is not black screen, It is a dark screen, back and forth maintenance (circuit maintenance will not be described in detail), after three days of testing the circuit is fruitless, I think that the backlight tube may cause interference, resulting in black screen protection, inform the customer of the details and inform the demolition After the risk of the screen, the customer's consent was obtained and the screen was started.
This model LG plastic screen has a total of 10 tubes (EEFL), that is, parallel tubes. Two tubes are used on both sides of the tube to connect 10 tubes in parallel (10 clips on the iron bars). There is a line on the left and right sides of the screen. Connect the high-voltage board, open the screen to pay attention to two points: 1. Before the screen is opened, remove the small screws around the screen, remove the two side strips, you can take the LCD screen body, the LCD screen uses the high-pressure cap as the suction cup, and then move it up to move the position. After it is misplaced, remove the suction cup, lift the left and right sides of the screen with your palm, and place it in a relatively flat place. After the screen is removed, there are self-buttoning plastic strips on both sides. After taking out, you can take the homogenizing board. A total of 3 sheets, two thin ones, one thick one, 10 small parallel tubes can be seen after taking out.
Note 2: The two ends of the lamp are fixed with five small flat head screws. Take four screws on each side, leaving only one screw in the middle. Then take the plastic clip in the middle of the lamp. There is a clip in the middle of each lamp. A set of lamps, two groups, in the back position of the screen, holding the clip by hand, force upwards, be careful not to use too much force, too large the tube will break, put the clips off, then the tube The two remaining screws on both sides are removed. At this time, the two metal strips of the lamp are held in both hands, and the metal lamp is slowly lifted up. The whole lamp group is down. After the lamp is removed, there is a light-shielding plastic piece under the lamp tube. See a 6 mm wide tin foil strip under each tube, and use a multimeter to measure whether the two ends of the foil strip are connected.
In this case, 6 faults were measured, and only 4 of them were normal. The 6 tin foil strips that were not accessible showed local bulging (the convex part is the breakpoint), which may be due to thermal expansion and contraction after long-term use. Has been opened, think about it, change it, not worth a few dollars, in case of trouble, I bought a tin foil paper width of about 48 mm, cut the length, divide each strip into six, each treaty 8 mm wide It can be flattened as it is (each has a positioning groove, do not worry about the shop is not straight), and finally installed in the opposite direction of the disassembly and assembly, the test machine can be.
The first time the EEFL lamp was removed, because one of the plastic clips in the middle was not unloaded, one of them was accidentally taken off when the lamp was taken. Fortunately, there was stocking in the store.
Case 2: The models are the same, the fault performance is different, and the machine is turned on in the cold state. After 5 minutes, the image appears flickering and dimming, and the interference horizontal line appears from time to time. Finally, the black screen, the backlight is bright, and there is sound.
Maintenance date: May 2016, after the purchase of the machine for five years, the voltage of each board is normal. Because of the last experience, the details of the screen splitting are the same as in the first example. After the screen is removed, the tin foil strip is directly measured, and there are 3 breaks. The solution is the same as the first example. The 10 tin foil strips are all replaced, which takes 2 hours, and the test machine is normal for 2 hours. Unfortunately, no maintenance pictures are left.
If you have any inadequacies, please forgive me!