Hello
The TV does not show any sign of life , I started the troubleshoot as this , no power Led, no reaction when pressing the power button.
I checked the Power coming out from the power supply, the 3.3V_standby is correct and steady, then I checked the 1.2V_standby produced by IC6001 which Is good as well.
So I decided to control the main IC , IC4000 , he does not output any oscillation on the Xtal, Then I am now bloacked there.
The schematic is downloadable on this website , the schema is weird because the processor is not represented with any Xtal output, but obviously it has one.
Thanks you for your hint and help.
Hello
There is the link to the schema below. The power supply works fine, but the processor never orders the main power to start by the POWER_ON pin.
https://elektrotanya.com/showresult?what=kdl-37ex402&kategoria=&...
Be careful in this schematic, it is a bit weird the main chip is diplayed in many pages in it's different sections.
I have some new informations, I have been in the wrong way due to the malfunction of the test lead of the oscilloscope, actually the processor is running, I could see the oscillation in proper frequency. The reset circuit is working.
I then decided to check the keyboard , but the power button is powered and works fine also. No power is going to control any of the 4 front LEDs.
I start to have some doubts about the NAND chip firmware. Perhaps a good bet to try flashing it.
Have a better day than here, it is a storm with heavy rain ...
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