This repair of a Haier TV, originally a power supply voltage circuit problem, using the light bulb to do the load, made a mistake in the high voltage package, and negotiated with the customer (maroon red brown). Had to replace the high voltage package.
When the customer sent the TV, the boot did not respond and the power indicator did not light up. The cover is powered up and the voltage is measured, and the voltage drops from 125V to 0V. At first, I thought it was a +B filter capacitor problem. When a 100W bulb was used as the load, the boot bulb was on, and the +B voltage was stable at 125V. The line test pushes the B pole and has a voltage of about 0.5V. It is concluded that the high voltage package is broken. After waiting for the high voltage package to be replaced, the fault is the same!
This blame has not been carefully tested. This machine power chip is STR G9656, can output voltage, indicating that the power block is no problem, should be in the voltage regulator circuit. Immediately measure the voltage regulator KA431, and measure the shorts of pins 1 and 2. Remove the measurement, 1, 2 short circuit, 3 and 1, 2 feet open circuit, replace it. It is also suspected that the optocoupler may also be broken. The test is removed. As a result, the short circuit of the 3 and 4 feet is 20K, and the replacement is made. Measuring other components online again, I feel no problem. Just use the bulb as a load tester and measure +B to 140V. It turns out that this machine is 140V is normal!
Disconnect the lamp recovery circuit, power on the test machine, the grating appears, the AV signal line is on, and the picture sound is normal.
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