Recently, Hisense is what happened. On the same day, he took over three Hisense LED LCD TVs, all of which were machines within two years. The performance of the faults was different. For a long time, they did not share the results with the friends, and they had time to sort out and release them one after another. This machine starts directly with blue light and no, the button remote control does not respond. Open the cover and check the voltage of the power board (HLE-4046WE) port, STB3.6VSW0V5VS5.2v12v (6~15v) 16v (8~24v) two sets of main voltage In this cycle, the board jumps, and the board has a "Tara" micro-sound. The initial judgment is that the power output abnormality causes the host to be inoperable. This model is similar to the fault phenomenon. It has been repaired by the friends. Carry out repairs according to your own ideas. Independently take off the board, according to the output instability factor, start with the sampling circuit, the machine samples from 12v, short-circuit optocoupler N840 3-4 feet (generally can roughly distinguish the fault between hot and cold hot end), no voltage output, it may At the cold end, the control pin of the sampling control N842 is short-circuited to the ground, and the fault remains unchanged; the sampling does not play a role, and the optical switch N833 N840 on the original board is directly removed and exchanged according to the principle of fast and reliable (note Do not install the wrong foot), found no output, so N840 failure is undoubted, change the original N833, take a good optocoupler to N840, power 12v 16v stable output, remove the forced boot point, reset the board, boot The music is ringing, the picture is presented, the input signal is normal, and the installation is completed. Kenwood Repeater,Kenwood Vhf Repeater,Kenwood Uhf Repeater,Kenwood Radio Repeater Guangzhou Etmy Technology Co., Ltd. , https://www.digitaltalkie.com