Changhong LCD TV LED50C2000 three no fault, teardown test power board primary voltage is normal, secondary no 12V output, unplug the motherboard 12V plug, power board 12V normal, test motherboard 12V short to ground.
After investigation, the sound is low-voltage 12V to ground short circuit.
Disconnect the 12V power supply and replace the 4803A with the normal test image.
No sound, easy to handle, the module, but the sound is too small, has not directly connected to the input port sound, it may be the reason for the sound block, decisively remove it.
It is really awkward to re-weld the original sound block. The C827 position is equipped with a 0.1 micro-method, and the test machine sounds normal. The TPA3110 is still very powerful.
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