Hitachi rear projection CMT5018D does not boot fault repair example - appliance repair - Huaqiang electronic network

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A Hitachi rear-projection CMT5018D does not turn on, the power indicator lights, and the power-on button is off. Standby measurement main power 68V, press the standby button, the entire power supply has no output, is in the protection state. Because the local protection circuit is a lot, one by one look a bit slow. So directly remove the standby tube Q907, protect the thyristor Q914 to make the power supply work independently, disconnect the line load, the main power supply with 100W bulb 120V output is normal. Restore the line load and start to hear the high voltage. Look at the filament is also bright, that is, there is no brightness. So slowly adjust the blue gun acceleration pole, observe the blue gun appears horizontal bright line. Prove that the problem is present in the scan. The power supply for measuring LA7838 is 0. Insurance E094 is blown. Change the integrated block LA7838 and insurance. The boot TV works fine.