sony kdl-32ex520

[bill25]

I have not 3.3v on stb i suspect the str-y6765 but iam not sure. Can you help me thanks.

[nomoresonys]

Re: sony kdl-32ex520

Did you check the fuse F6001 and for bad solder joints on powersupply board?

[budm]

Re: sony kdl-32ex520

I have not 3.3v on stb i suspect the str-y6765 but iam not sure. Can you help me thanks.

Beside not having the 3.3VDC for the STBY, do you have other Voltages at all?
What DC Voltage when measured between the two legs of C6112, about 330VDC?
If you do have 330VDC or so then check the fusible resistor R6301 (0.1 Ohm) to see if it is OK or not.

[bill25]

Re: sony kdl-32ex520

I've done all the obvious checks of the psu, resistors,bad solders,caps,mosfets,and some transistors.So the voltage on the capacitors is ok and the resistor too. On the second Part of the psu all voltages are missing. I have the basics and more about electronics. I need your help because i'm stuck and the forum have amazing people with perfect skills and knowledge base far beyond of me.

Thanks in advance.

[nomoresonys]

Re: sony kdl-32ex520

http://www.shopjimmy.com/sony-1-474-...-ge2-board.htm pic. of board if it's yours.

[nomoresonys]

Re: sony kdl-32ex520

CN6704 need to list all the voltages on this connector, if you have no voltage at all make sure your power cord is good.

[budm]

Re: sony kdl-32ex520

You need to find the spec sheet of this 'str-y6765' so you can get the pin out to start checking the Voltages on the pins, since you are working on the hot deadly side of the circuit so make sure you use the negative leg of the main filter cap as your circuit GND ref for the meter.

[bill25]

Re: sony kdl-32ex520

The problem is that the str in my board has 300 vdc on the pin 1 and the other pins mesures 0. Maybe str is dead or some other parts on the circuit is the problem.The pdf schematic shows the pin one takes power from the transformer and the pin 3 is the vcc.


https://cdn.badcaps-static.com/pdfs/...7a91a70e17.pdf

[budm]

Re: sony kdl-32ex520

So the VCC pin has 0V, correct?
The IC has internal circuit that will provide the Voltage to the VCC to get the IC start running, the start up Voltage threshold is 15.1V (TYP.) as shown in the spec sheet of the IC.
Check the resistance between Pin 2 and GND pin to see what you have.
Check the resistance between VCC pin and GND pin to see what you have.
We also need the straight shot pictures of the whole bottom side of the board also, it must be high def so we can trace the connections.

[bill25]

Re: sony kdl-32ex520

Resistors is good and the most suspicious parts is checked.

Here some pics

[budm]

Re: sony kdl-32ex520

How about the resistance I asked you to test in my post #9?

[bill25]

Re: sony kdl-32ex520

Ok i'm sorry you need resistance and not resistors

2 pin GND 0,10 ohm

vcc GND 09,2 ohm

[budm]

Re: sony kdl-32ex520

Ok i'm sorry you need resistance and not resistors

2 pin GND 0,10 ohm

vcc GND 09,2 ohm

Is the VCC and GND resistance reading really in Ohms not K Ohms M Ohms? Please verify for sure, it if they are really that low Ohms that you need to remove the IC and re-test the resistance on the empty pads again. That 9.23 Ohms reading on the VCC pin can be dued to bad IC or bad filter caps connected to the VCC pin.
Just to be sure, the resistance tests are done without the TV being powered, correct?

[bill25]

Re: sony kdl-32ex520

Without IC on board empty pads VCC,GND measure M Ohms.

[budm]

Re: sony kdl-32ex520

That means the IC is bad then. You can verify that by measuring the IC pins.

[bill25]

Re: sony kdl-32ex520

I will buy a new IC and then we will see what happens.

Thank you very very much for now. I will inform you when i'm ready.