Model: TCLAT34187
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Fault phenomenon: There are sound, no image maintenance ideas and steps: Because the sound is normal, you can judge that the power circuit is basically no problem. When the machine is turned on, the filament is not bright, and the line scan and line output are checked.
Shutdown check line tube Q402 (BU4508) has been broken, high voltage package power supply current limiting resistor R409 (1 Ω / 1W) open circuit, replace the line tube, remove R409, do not rush to power, because the general tube breakdown generally has other reasons cause.
Careful inspection of calibration, deflection, reverse-capacitance and other related components, no problems found, high-voltage package has no obvious ground breaking phenomenon, start-up detection line current, the needle flashes past, the power supply immediately protects, showing a large current state.
Judging the bad pressure package, buying and reloading, re-starting to detect the line current, 310ma and very stable, installed the upper limit current resistor R409, sound, figure appears, but because of the market high voltage package parameters and the original machine high voltage package parameters have a certain gap, high pressure Insufficient, the screen line and field range are large.
In the memory, the movement seems to have a line adjustment function, open the bus, and sure enough, adjust the line, field amplitude, get the job! Since the power supply of the high-frequency head, the middle-position, and the sound amplifier of the movement comes from the switching power supply, when the power supply is normal, there is sound accompanying, and the maintenance of the series of movements must be taken care of, so as to avoid misjudgment. The machine enters the bus method: open the remote control, find the SERVICE button on the remote control board, press the conductive rubber button of the original machine once (the button is not equipped with conductive rubber), press the mute button once within 3 seconds to enter, the mute button changes Adjust the project, CH+, - select the corresponding item, VOL+, - adjust the parameters, shut down and exit.
Tips: TCL TV as long as the CPU is TDA93XX series, the entry into the bus is basically the same.
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