By normal standards, this "fault" didn't seem to need to repair, direct, according to the power master switch to turn it off. Considering the integrity of the function of the machine, and respect the user's operation habit, we are still repairing. From the failure phenomenon, the problem was with standby circuit or microprocessor circuit. Because without the remote control to turn it off when everything is normal, and in the normal watch can remote control shutdown, can also remote boot, but the basic rule out the possibility of standby circuit failure, so the judge fault lies in a microprocessor (CPU) circuit. 4wtservice manual download site
 4wtservice manual download site
 4wtservice manual download site
 4wtservice manual download site
This machine use MNl5142TEAI CPU, the 6 feet to control power supply, the boot with normal watch the feet are high level voltage 4.3 V, in standby state to 0 V. According to the general CPU power switch after test voltage of 4.3 V, 6 feet in working state; Shut off the power switch after shutdown, with the remote control to switch on the power button again, the light silent, standby indicator, measure the CPU voltage of 6 feet OV, confirmed in the standby state and led to the CPU can't boot failure at a time. So, what causes the CPU in a standby mode? Analysts say there are two possible: one is the CPU has fault, 2 it is the CPU internal logic program disorder was caused when the remote control to turn it off. From the point of the television works, the former is unlikely, so focusing on the latter. In theory, remote control to turn it off when the impact on the CPU is the CPU power supply switch, of course including the impact on the reset circuit. But the actual CPU power supply side 39 feet in normal watch and standby mode has the normal power supply voltage, carefully check the reset circuit ICll06 (MNl280 - P), the element such as Cll03 also no exception, try substitution + 5 v power supply filter capacitance C1134 is null and void. Seems there is something wrong with the CPU, cause in the remote control to turn it off after a logic program on the disorder. Together with the machine without external special memory, but the integration within the CPU and more confirm the fault is on the CPU, but after replacing MNl5142TEAl fault remains.

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