Author£ºUnknown
Source£ºNetwork
2015-07-02 07:48:01
Core tips£ºPanasonic TC-2188 (C-150 movement) color TV, can not be opened after lightning
This machine was struck by lightning. Power supply circuit is severely damaged, after repair. TV still can't open. The reason is that the machine's CPU (MN15151TWP) (29) pin can not output the 0V boot level. Under normal operating conditions, the boot / standby voltage output of the pin should be 0V/5V. But now only output 1V/2V. obviously. After lightning strikes. CPU control of the boot, standby function has been destroyed.
Analysis of the circuit can be known, the 0V voltage is to make the controlled Q803 reliable cut-off, to make the follow-up power circuit normal work. Q803's reliable cutoff is the necessary condition for maintaining the stable output of the power supply circuit. The CPU output of the 1V voltage. Q803 saturation, so the TV can not be turned on. If you remove the Q803, not just Q803? After the removal of the Q803, and it is expected that the TV set to achieve normal open. And in addition to the standby function, other functions of the TV are completely normal. The use of such emergency measures to make the TV normal work, but for the time being not to buy the price of up to 100 yuan CPU (MNl5151TWP).
Therefore, in case of Panasonic C-150 TV similar to the failure, can be used to extend the use of similar measures to extend the life of the color tv.