How long does it take for Konka TV to boot automatically after booting? Re-plugging the power still does not work and the fault reoccurs. Below, please follow the author to understand how to deal with Konka LCD TV in the case of automatic standby failure and maintenance of detailed ideas.
1, set the problem
It is recommended to turn off the TV for a period of time and try again. Check if there is no standby function, automatic switch and other related functions in the TV. You can refer to the manual and turn off this function.
2, restore the factory settings
Generally there are several methods to restore the factory settings. It depends on what remote controller you are. The first kind is: Press and hold the setting selection key and the channel + key to release it. Second: Press and hold the selection key and show. The key can be released; Third: If the remote control has a factory reset, press and hold the setup key and restore the factory settings. If not, try the following methods.
Konka TV's automatic standby fault repair method
1, see the protection circuit
This machine power test machine. After hearing the sound of high pressure, more than 20 seconds after the automatic standby, is the protection off? Looking at the protection circuit, the legs (36) and (49) are passive, and the voltage on both legs is normal. There seems to be another reason. The measured main voltage is about 130V, normal, about 70V in standby. Using the boot time of more than 20 seconds, the quick shot voltage is about 190V, obviously in the cut-off state, but the filament is always off, so the focus is on the filament voltage.
2, filament voltage
Use a multimeter to measure the non-filament voltage with the AC blocker, and disconnect the filament pin with an AC voltage of about 7V. There is no voltage when the lamp pin is connected. It is believed that the leakage of the socket caused the above-mentioned phenomenon, but after the replacement of the socket, the fault persists, and there is no problem if the multimeter is used to detect the fault. Replace the filament circuit elements one by one. When the resistance is changed to R406 (1Ω/3W), the filament is bright, and the resistance under test is actually open.
3, resistance voltage
Replacing the Filament Resistance Although the filament is bright, the screen remains blank. Increase the accelerating voltage. There is a horizontal bright line at the bottom of the screen. Measure the voltage of 12V on the N401 (LA78041) power supply pin. If the replacement of the LA78041 fails, the fault persists. Test N103 (OM8373) (21), (22) feet positive and negative voltages are about 0.8V, normal. Is it a problem with memory? The fault remains unchanged after replaceable. Put on the original memory, check the device related to the field block, found no problems. Only try for N103.
4, movement as the plate
After the replacement, a long-lasting grating appears, but the grating is unstable and there are several alternate colors. Considering that the movement of the movement board is prone to problems, it was observed that R5l9 (470Ω/1/6W) was slightly discolored. The measured resistance was close to 1kΩ; R518 was also discolored, and the resistance was removed. About 1.8MΩ. Replace the two resistance after the test machine, raster appears, snow is normal, remote control test machine is actually all English display.
Because there is no Chinese-British switch in the model menu, it enters the bus and changes the CHI item to “ONâ€. After exiting, the Chinese display is normal. Plug in the cable signal test machine, automatic search does not save the station; after the memory is replaced, everything is normal.
According to the author's investigation, Konka LCD TV automatically standby after boot, and then restart, has been a dead cycle, generally the power of the filter capacitor is broken, Konka's common problem is that the power part of the capacitor is too much garbage, look up first, the key to capacitance detection includes bulging , leakage, performance degradation and so on.
Operational error causes automatic standby processing
It is recommended to turn off the TV for a period of time and try again. Check if there is no standby function, automatic switch and other related functions in the TV. You can refer to the manual and turn off this function.
2, restore the factory settings
Generally there are several methods to restore the factory settings. It depends on what remote controller you are. The first kind is: Press and hold the setting selection key and the channel + key to release it. Second: Press and hold the selection key and show. The key can be released; Third: If the remote control has a factory reset, press and hold the setup key and restore the factory settings. If not, try the following methods.
Konka TV's automatic standby fault repair method
1, see the protection circuit
This machine power test machine. After hearing the sound of high pressure, more than 20 seconds after the automatic standby, is the protection off? Looking at the protection circuit, the legs (36) and (49) are passive, and the voltage on both legs is normal. There seems to be another reason. The measured main voltage is about 130V, normal, about 70V in standby. Using the boot time of more than 20 seconds, the quick shot voltage is about 190V, obviously in the cut-off state, but the filament is always off, so the focus is on the filament voltage.
2, filament voltage
Use a multimeter to measure the non-filament voltage with the AC blocker, and disconnect the filament pin with an AC voltage of about 7V. There is no voltage when the lamp pin is connected. It is believed that the leakage of the socket caused the above-mentioned phenomenon, but after the replacement of the socket, the fault persists, and there is no problem if the multimeter is used to detect the fault. Replace the filament circuit elements one by one. When the resistance is changed to R406 (1Ω/3W), the filament is bright, and the resistance under test is actually open.
3, resistance voltage
Replacing the Filament Resistance Although the filament is bright, the screen remains blank. Increase the accelerating voltage. There is a horizontal bright line at the bottom of the screen. Measure the voltage of 12V on the N401 (LA78041) power supply pin. If the replacement of the LA78041 fails, the fault persists. Test N103 (OM8373) (21), (22) feet positive and negative voltages are about 0.8V, normal. Is it a problem with memory? The fault remains unchanged after replaceable. Put on the original memory, check the device related to the field block, found no problems. Only try for N103.
4, movement as the plate
After the replacement, a long-lasting grating appears, but the grating is unstable and there are several alternate colors. Considering that the movement of the movement board is prone to problems, it was observed that R5l9 (470Ω/1/6W) was slightly discolored. The measured resistance was close to 1kΩ; R518 was also discolored, and the resistance was removed. About 1.8MΩ. Replace the two resistance after the test machine, raster appears, snow is normal, remote control test machine is actually all English display.
Because there is no Chinese-British switch in the model menu, it enters the bus and changes the CHI item to “ONâ€. After exiting, the Chinese display is normal. Plug in the cable signal test machine, automatic search does not save the station; after the memory is replaced, everything is normal.
According to the author's investigation, Konka LCD TV automatically standby after boot, and then restart, has been a dead cycle, generally the power of the filter capacitor is broken, Konka's common problem is that the power part of the capacitor is too much garbage, look up first, the key to capacitance detection includes bulging , leakage, performance degradation and so on.
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