Television is a more intelligent product, and it's more common in our actual lives and believes that you're familiar with it. Of course, there are a variety of problems in the use of televisions, which we are often prone to in relation to failure to operate, so let's go on to tell you exactly what the reason is for the failure to operate televisions, as well as a few common branded solutions。
I. Why can't the tv go on
1. Power lines are not ready or the power adaptor has no voltage output。
2. Inner television switches, transformers, no voltage output, peripheral electrical components, etc。
3. Anomalous or an anomaly in the power source module (ic)。
4. Remote controls are free of electricity or damage。
5. The television control panel key is damaged or leaked。
The main board, cpu circuit, is unusual。
7. Short circuits such as high pressure plates, y plates, buffer plates, etc。
Ii. Solutions for several common brands of television
1. Genevieve tv:
(1) check whether the power panel 300v power supply is normal and if not, check the front-end circuits of the power source, such as transformers, steady pressure on ic, whole-stream diodes, filters, capacitors, etc。
(2) if there is 300v power supply, check whether the power plate 5v, 24v, 12v has any power supply; no small resistance, capacitation, etc. Around the switch. If so, please further check the main board, the cpu circuit, etc。
2. Sharp television:
(1) the failure to operate normally begins with the suspicion that the switch on the power circuit and the remote control system control the switch on ... The corresponding circuit. Thus, at the time of the malfunction, the microprocessor n701 (m50436-560sp) had a normal +5. 0v for power supply and, using the stand-by key on the remote control, the n701 remote-control signal input had a voltage on foot 5, indicating that a remote-controlled signal had been entered into the microprocessor, but that there had been no signal output on the power switch/switch for foot 9, and only +4. 1v for re-entry, with only +4. 1v for deviation from normal values, waiting power circuits and start-up circuits, only +5. 6v (normally around +1ov) was measured for c834 with low voltage。
(2) an examination of the convulsive c834 revealed that it was leaking and having a reduced capacity, which caused the power supply to be too low and that the microprocessor's start-up circuit v810 did not provide normal repositioning voltage to n701's thrust 27, so that the microprocessor could not function properly, causing the above-mentioned failure, replacing a new congenial element, electrocution tests, and the television failure was eliminated。
Three, three-star television:
(1) the 4-foot voltage of the detector n801 (lc8645j6v-5c18) is 0. 6v. Disconnecting from the 41st foot of n801 to crossline w071 is about to break the protective circuit and turn on the raster, but the image appears on the running platform, thus indicating that the aft circuit is malfunctioning。
(2) the aft voltage from the 7 foot of n201 (la7687), which was added to the 13 foot of the microprocessor n801 by electric resistance to r177. R176 and r175, measured for n201 the 7 foot voltage was 4. 2v, normal, measured for n801 the 13 foot voltage was 4. 3v, high, and determined that the aft circuit was malfunctioning. The aft quarantine resistance r176 was severed and the 13 feet of n801 were still measured at 4. 3v, indicating that n801 was damaged. When n801 was replaced, the search was normal and the images were normal, but there was no acoustic. The 8-10 foot voltage of the audio discharge circuit n001 (tda7623m) and the 9 foot power source voltage of 0v indicate the failure of the power circuit of the cell block。
(3) checking the power circuits of the power block and finding that r645 has been opened and that the 8-10 foot interior of the acoustic block n001 has been punctured and that the failure has been eliminated after replacing r645 and n001。
4. Tv:
(1) the measured +b output voltage of 30v and the +5v output voltage around 4. 2v are apparently caused by the failure of the microprocessor to work, which renders the key inoperable and the television is on standby。
(2) the operation is normal after the break of v683. Checking the 5v's steady voltage circuit, disconnecting the 5v's connected circuit in turn, returning to normal at the time of the break-up of the compound circuit v824, detecting no problems in the repositioning of the circuit, rewelding the repositioning of the circuit elements, again, the start of the engine is running normal immediately after the switch to v824, indicating that the v824 performance has deteriorated。
The technical requirements for televisions produced by different brands are different, thus leading to a certain difference in approach when taking concrete measures to solve the problem. If you do not really have maintenance operations, then do not take them down at will, which would cause a more serious risk to televisions, either by hiring professional maintenance staff or by going to the maintenance office to perform the related maintenance to ensure that the television sets are functional and do not affect their useful life。
