Ii. Genevieve tv maintenance presentation of the most detailed maintenance options!
1. Fragmentation: the automatic shutdown of a television set after more than 10 minutes of operation, at which point the power of the television light was activated and the failure of the switch again continued。
C. C. And 22 feet. If, after re-opening the tv, it's normal, then it's no longer malfunctioning the switch on the switch on the power source and scanning circuit, which may be related to the start-up circuit of the tv. In the course of the maintenance of the genevieve television, if q609 b is measured as unstable, c620 and zd601 are checked after the shutdown, and its voltage resistance is gradual at 1k-8. 2k, then it should be the result of the q609 malfunction, which eventually led to the failure of the ic201 42 foot-starting voltage and automatic shutdown, which could be eliminated after the replacement of r623。
2. Fragmentation: tv circuit boards are burned and users observe images of televisions that are distorted and deformed, while smoke comes out after the smell of the charade and the televisions have no images or sound。
Fault repair: in the course of the maintenance of the creative television, if the circuit boards at one of the r312 foot welding points were found to have been burned out of a black hole, while the printed copper had been burned out, the partial short circuits of the b+ load at the time of the initial check did not show any anomalies, such as the circuit safety tube and the current limit. In order to better identify the cause of the failure, the l604 in the b+ power supply section was removed, while the incandescent light of the welding 100w at both ends of c619 was detected after the electricity went off and the power of the b+ was slightly too high and the output of the other components was very stable, so that we could identify the part where the cause of the failure was the load。
3. Fragmentation: the television displays an abnormal image during viewing, with a horizontal black belt on the colour screen。
(a) fault repair: the possibility of external interference can be ruled out if the black belt of the high frequency is still present after the removal of the high frequency (hf) head in the course of creative television maintenance. The reasons for the failure of the black belt on television are the poor filtering of the field output circuit, the poor filtering of the switch power, which leads to poor foot contact with the large power elements that interfere with the entrance to the field output circuit. The filtering of the power from the switch to the output source is normal, so that the home-made maintenance switch can be used to replace the power supply from the original power source to the entire machine during the inspection, and the disruption hours, so that it can be established that the failure occurred in the switch's power source and that the failure can be eliminated after the replacement of the cold and thermal isolation。
With regard to the maintenance costs required in the event of damage to the circuit boards of the original lcd television, it is generally not an economical option to use the original circuit board and to bear the associated operational costs of manual maintenance and processing, as well as the freight costs incurred during the journey back and forth, so that consumers can refer to the circuit board products of other businesses on the market that match those of lcd television, and can consult local maintenance and treatment services to determine the most economical options after a comprehensive factual analysis。
