TCL color TV AT21S135 failure phenomenon is sometimes normal boot, sometimes boot black screen or standby state, the whole machine does not respond to the button remote control does not work, when the fault occurs, the measurement chip [TMPA8803] +5V, bus voltage, reset voltage [about 5.2V] All are normal, substitution memory, buttons, etc. are invalid. Check the circuit, field pulse and other circuits without problems. Repeated test machine found that after a long power outage, it can be turned on and watched normally. If the screen is turned off and then the black screen appears and the filament is on, the backlight will flash brightly. It is unlikely that the chip will be damaged according to the fact that it can be turned on and watched normally. Suspected whether the chip did not enter the working state or the reset is not good, so when the black screen appears, short circuit the chip reset 5 feet, hear the high voltage, immediately turn off, immediately restart, and then the blue screen raster machine works normally. At this point, it is determined that the fault is caused by poor reset. Careful inspection and replacement of the 5-pin peripheral circuit have not found any problems. Finally, it is found that when the multimeter 2.5V is connected to the 5-pin and ground, everything is normal. Immediately find a 30K resistor connected to the 5 pin power failure failure, repeated test machine failure no longer appears, re-measure 5 pin voltage at 4.1V or so slightly lower than the original does not affect the use. 9H Flexible Glass Screen Protector
This kind of Flexible Glass Screen Protective Film is made of nano-glass material and is an indispensable device for people who often drop their mobile phones. The Flexible Protective Film can be perfectly fixed on the mobile phone to completely protect the mobile phone screen to prevent scratches and cracks on the edge of the mobile phone screen.
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In case the screen is damaged, the Screen Protector will break into small pieces that are not sharp, which is much safer than other glass screen protectors on the market.
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