The hysin group is a large electronic information industry group, known by basically older people in the country, especially haisin tv, which was founded in 1969, has now been in existence for more than 40 years, and after decades of historical stagnation, the hysin group is technically and capitalically the best in industry, and its products are basically sold overseas, but with the proliferation of products, the number of failures has increased。
The reason i can't turn it on
Case i:
(b) faults: televisions are difficult to start and sometimes cannot start work for half an hour or hours。
Fault repair: when the machine malfunctions, the power light comes on, and the remote control is used to operate the television to hear the sound of suction in the power panels and relays in the machine, but the television doesn't work. The maintenance of the power panel pfc circuits found c810 large electrolytic uplift filters, electricity capacity, voltage only around 360 v。
At this time, the entire machine was at zero vdc except for normal 5vs on-board voltage, at which point the machine was in a non-working state, and measured the working voltage of the feet of the pfc controlled primary chip n811 ncp 33262, of which the working voltage of the feet 5, 7 and 8 was abnormal. The five-foot voltage around foot 10v, respectively, was only about 0. 9 v and seven feet zero, with maintenance failure continuing。
Finally, most of the elements of this circuit have been replaced, with the above-mentioned three feet normally at approximately 5, foot 2. 6 v, 7 foot 0. 4 v, 8 foot 15-17 v, and, if not normal, only about 360 v on the c810 sides of the circuit, and the complete machine is unable to work (the output voltage of 24 v, 5 vm, + 12 v, + 16 v is all 0 vdc) at around 390 v on both sides of the c810 cap, and most of the power panels of this type are currently corresponding to the above-mentioned malfunctioning period。
Fragmentation: the failure of the whole machine was caused by the failure of the pfc output as a result of the failure of the r823, r824, r825, which was detected by maintenance, as a result of the detection of voltage anomalies at n811#. Dismantling all three of these resistances, cleaning up the pcb plate, loading it up, debugging it. Applicable type: tlm40v68pk, tlm42v67pk。
Case ii:
Turn it off sometimes it doesn't turn on. Blue lights are on. In the end, it's getting worse! 5v is 4. 8v. Pfc is 408v proving that the circuit is working properly. The complete replacement of the 12v, 24v, 5v filtering caps remains faulty. It is normal to have 408 v for foot control, which is based on control of relays, which control 300 v for pfc circuits。
Whether or not the 24v oscillation circuits were brought down to 0 at 24v by accident, and the drawings were considered to be silent in this line of thinking, 12v, 18v, 24v oscillation circuits were run by n831 ncp1396adr2g and 12 feet were powered by the foot, which was supplied by n811pcc d813 c811 c812 and measured at 11v, which was clearly low and decisively replaced by c81110uf/50v, c812 10uf/50v. Operators measure d813 voltage 16v, 5v 4. 8v to 4. 9v. "hisense!♪ i'm sorry ♪♪ i'm sorry ♪
While enjoying the fact that the technological maturity of digital products gives us pleasure, we also suffer from the troubles caused by the failure of digital products, the complexity of the inside of the television, the difficulty of repairing them, the possibility of high pressure on the television, the possibility of discharge even after the power cuts. If you really don't know anything about electricians, it would be better to have a professional maintenance and television master to help you with the maintenance of the television, if you know about the electrician, and if you have the experience of dismantling television, perhaps the article will provide you with some information。
