Hello All,
I'm currently working on this Sony 65x9004A that have no display with a "4 blink" error code. If not mistaken, the error code mean LD board or panel fault. Sometime there are startup sound from the speaker, sometimes not. Initially I thought the LD board could be faulty, but after some troubleshooting I find that there is no voltage supply to the "VLED_VCC". I'm not sure how many volt should be on the "VLED_VCC"?
The "LD_ERR" go from 0 to 3.75V, Indicating the LD board fault? Also there this is "GL_CTRL" go from 0 to 3.75V. I'm not sure what is the indicating? The 4 LED backlit connector was disconnected from the LD board during the measurement.
So my question....could this be the power supply fault? or the power supply is not powering up the "VLED_VCC" because a missing good signal from the LD board?
I have tried grounding the "LD_ERR" with a 100ohm resister but still no voltage at the "VLED_VCC".
I can also hear some buzzing sound from i think one of the transformer.
I'm currently working on this Sony 65x9004A that have no display with a "4 blink" error code. If not mistaken, the error code mean LD board or panel fault. Sometime there are startup sound from the speaker, sometimes not. Initially I thought the LD board could be faulty, but after some troubleshooting I find that there is no voltage supply to the "VLED_VCC". I'm not sure how many volt should be on the "VLED_VCC"?
The "LD_ERR" go from 0 to 3.75V, Indicating the LD board fault? Also there this is "GL_CTRL" go from 0 to 3.75V. I'm not sure what is the indicating? The 4 LED backlit connector was disconnected from the LD board during the measurement.
So my question....could this be the power supply fault? or the power supply is not powering up the "VLED_VCC" because a missing good signal from the LD board?
I have tried grounding the "LD_ERR" with a 100ohm resister but still no voltage at the "VLED_VCC".
I can also hear some buzzing sound from i think one of the transformer.
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