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TVs

TOP HOUSE KDL42XS718UN does not light only standby led

leonardor
hace 6 años
hace 6 años
Good afternoon friends, I have LED that came to my hands with the problem that it was in standby and not turned on either with the control or with the manual control, I found that the plate instead of generating 12v only had 6.75v stable as I do not count with the diagram I set out to check damaged voltages and components just change a zener diode and review many welds and now instead 6.75v I have 5v also stable, in ps on I have -2.45v change filters and check the mosfet but nothing anyone Could you give a little hand? on the board is power supply; 34011174 kip + l090e02c1
Javier Honduras
hace 6 años
hace 6 años
Greetings friend ... interesting that when you change the zener diode you will lower the voltage to 5 volts if I change that diode just to test and it is not short, reinstall it and measure again ... some sources throw the full voltage until it turns on the tv for example if it says in the source 13 volts but there are only 8 with the tv off when you turn it on, the 13 volts are already complete ... your tv is not turning on try to disconnect the tv buttons that are sometimes damaged and block the ignition and turn on with the control ... check the source well if there is no short circuit or component damaged the source can be activated manually you have to disconnect the main video board and make a bridge with a resistance of 47 ohms between the standby voltage of 3.3 or 5 volts towards the power on or ps on pin and measure the secondary voltages to see if they are activated but first check that source well and test the buttons .... comment results

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