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웃 유10PCS 2SK TO K TO new MOS FET transistor – a
Looks like there are various versions of this power supply board. Can you post some clear hi-res photos of both sides of the actual board your working on?
Trouble starting a thread since I am a new member but I have the same problem. You aren’t doing something wrong. All times are GMT I have a Calypso 40″ TV with the same problem. Resistance between S and D should show an open circuit.
2SK3569 View Datasheet(PDF) – Toshiba
If your FET shows signs of life with these simple ohmmeter tests, don’t bother replacing them just yet. The scorch is on the full picture of the back where the high voltage wires are taped down now burnt off probably from the heat from the wires.
Thanks for any tips. Perhaps someone with a nifty drawing program can help with a sticky.
Which picture show the scorched mark? The 24V has nothing to do with that inverter section. New York My Country: Thanks to all who helped, I’m looking forward to my next adventure!!! Last edited by stormy; at I didn’t realize I’m supposed to somehow measure from the TOP while the connector is in-place The 24V should be a switched 24V which will not datsaheet present at the connector until the power supply board gets the PS-ON signal from the main board.
Only the Diode settings shows signs of life as described above. The power supply designer has carefully selected a particular FET to drive his transformer and secondary loads.
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. Actually, this photo looks more like my board see brown area on the left side: Find More Posts by trebo.
Originally Posted by stormy Multimeter in Diode position: I will start a new thread. I have on hand very similar K transistors, and wondering if this is safe datasehet exchange these two?
Last edited by budm; at I now see it, in that case, I must’ve tested the K incorrectly, maybe it is good after all You have to check specs on the parts to see if they are close enough. Multimeter in Diode position: If you see a low resistance, or a dead short such as 1 ohm, it is smoked. There is a burnt electronics smell with the tv on. If they are NLA Newport, OR My Country: From this thread, seems like I should replace the transisors mounted on the datashheet and test the diodes in this area.
Find More Posts by fzabkar. 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.
Page 1 of 2. Find More Posts by Longbow. This is one place where the original devices should be used. Find More Posts by neilc6.
The second part of the test involves putting a little bias on the gate. All electrolytic caps are not bulged and look ok. Find More Posts by stormy Find More Posts by momaka. LEFT most pin marked 24V, comes at 12v, and drops down as I measure, went down to 6V, and probably more, i just kept going. Briefly short S to G to bleed off any residual voltage.
Testing the board’s outputs, all except the 24v ccfl yields VDC. I’m pretty sure the other board does work, and does send the signals, since the speakers are powered from it, and they work, also it powers on the TV, i.