Sony Bravia KDL-40EX400 dead

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  • suiramix
    Senior Member
    • Mar 2011
    • 131
    • Canada
    #1

    Sony Bravia KDL-40EX400 dead

    Back in April, I was asking for some help in regards of Sony KDL40-EX400 LCD tv with no power up (dead set) by pressing the remote or tv set power button. The power supply board G2HE had only [STBY 3.3V] = 3.31V and and [AC OFF DET] =0V and everything else is 0V.
    In the meantime, I did order and replaced IC6301 (Sony CXA3809M), but no joy , same result. Now at connector CN6101 the voltage are:
    pin 1 [STBY 3.3V] = 3.30V
    pin 2 [AC OFF DET] = 2.80V
    pin 3 [POWER ON] = 3.21V
    pin 10[BL_ERR] = 3.30V , and everything else is 0V.
    According to training manual CTV61 , “dead set” condition is possible due to loss of REG12V , but not explain how to troubleshoot it! So what else should be defective?
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