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Originally Datazheet by stormy Actually, this photo looks more like my board see brown area on the left side: Multimeter in Diode position: That big long board on the left is the Balancer Board. If your FET shows signs of life with these simple ohmmeter tests, don’t bother replacing them just yet.

Does this mean this is a good transistor?


Resistance between S and D should show an open circuit. Perhaps someone with a nifty drawing program can help with a sticky. Datsheet second part of the test involves putting a little bias on the gate. Only the Diode settings shows signs of life as described above. Looks like there are various versions of this power supply board.

I now see it, in that case, I must’ve tested the K incorrectly, maybe it is good after all If you see a low resistance, or a dead short such as 1 ohm, it is smoked. The 24V has nothing to do with that inverter section.

2SK3569 Datasheet

Can you post some clear hi-res photos of both sides of the actual board your working on? For example, an “HBA” board claimed to be working, adtasheet the burnt signs Do you think I can exchange the CNF1 connector from my bad board to one of these used boards?


From this thread, datazheet like I should replace datasueet transisors mounted on the heatsinks and test the diodes in this area. I will start a new thread. Find More Posts by SteveNielsen. Find More Posts by budm. The power supply designer has carefully selected a particular FET to drive his transformer and secondary loads.

Last edited by stormy; at Bay area My Country: Use a spare resistor of maybe K hooked between the D and G for an N-channel or between S and G for a P-channel Now the resistance will be low – the transistor is biased on. I didn’t realize I’m supposed to somehow measure from the TOP while the connector is in-place The scorch is on the full picture of the back where the s2k3569 voltage wires are taped down now burnt off probably from the heat from the wires.

Thanks to all who helped, I’m looking forward to my next adventure!!! Originally Posted by stormy Multimeter in Diode position: Mar My Country: LEFT most pin marked 24V, comes at 2s3k569, and drops down as I measure, went down to 6V, and probably more, i just kept going. This is one place where datasheef original devices should be used. All electrolytic caps are not bulged and look ok.

If they are NLA All times are GMT New York My Country: You aren’t doing something wrong.

Helping people troubleshoot electronics is a big part of what goes dataheet here. Find More Posts by momaka. So what is the exact make and model of this TV and what is it not doing?


I 2sl3569 a Calypso 40″ TV with the same problem. The 24V should be a switched 24V which will not be present at the connector until the power supply board gets the PS-ON signal from the main board.

Testing the board’s outputs, all except the 24v ccfl yields VDC. Briefly short S to G to bleed off any residual voltage.

2SK3569 MOSFET. Datasheet pdf. Equivalent

Please make sure to put the pin number, follow by the pin names, and follow by the Voltage reading so we can tell which pin is which and what Voltage each one has.

You have to check specs on the parts to see if they are close enough. Find More Posts by Longbow. I’m planning to just replace and see if that area of the board puts out the marked 24VDC, and if not, find the exact K transistor.

Page 1 of 2. Find More Posts by stormy I’m pretty sure the other board does work, and does send the signals, since dagasheet speakers are powered from it, and they work, also it powers on the TV, i. I have on hand very similar K transistors, and wondering if this is safe to exchange these two?

Find More Posts by neilc6. Thanks for any tips. Last edited by budm; at The time now is Different FET’s will typically overheat due to different Ron values, switching times, etc.

Trouble starting a thread since I am a new member but I have the same problem.