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K Datasheet Toshiba Semiconductor pdf data sheet FREE from
Find More Posts by neilc6. The 24V has nothing to do with that inverter section. Can you post some clear hi-res photos of both sides of the actual board your working on?
All electrolytic caps are not bulged and look ok.
2SK – 2SK part cross-reference datasheet –
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. Find More Posts by SteveNielsen. Testing the board’s outputs, all except the 24v ccfl yields VDC.
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. Find More Posts by trebo.
The second part of the test involves putting a little bias on the gate. Thanks for any tips. Find More Posts by stormy Does this mean this is a good transistor? If you see a low resistance, or a dead short such as 1 ohm, it is smoked. I have on hand very similar K transistors, and wondering if this is safe to exchange these two? For example, an “HBA” board claimed to be working, despite the burnt signs Do you think I can exchange the CNF1 connector from my bad board to one of these used boards?
All times are GMT Resistance between S and D should show an open circuit. 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.
TOSHIBA Field Effect Transistor Silicon N Channel MOS Type
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. That big long board on the left is the Balancer Board. Find More Posts by Longbow. Mar 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 now see it, in that case, I must’ve tested the K incorrectly, maybe it is good after all The power supply designer has carefully selected a particular FET to drive his transformer and secondary loads. You aren’t doing something wrong.
Page 1 of 2. 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.
Bay area My Country: I will start a new thread. Find More Posts by budm. Thanks to all who helped, I’m looking forward to my next adventure!!! This is one place where the original devices should be used. Briefly short S to G to bleed off any residual voltage. Perhaps someone with a nifty drawing program can help with a sticky. If they are NLA If your FET shows signs of life with these simple ohmmeter tests, don’t bother replacing them just yet.
Originally Posted by stormy Multimeter in Diode position: Multimeter in Diode position: Last edited by stormy; at Which picture show the scorched mark? So what is the exact make and model of this TV and what is it not doing?
I didn’t realize I’m supposed to somehow measure from the TOP while the connector is in-place The time now is New York My Country: Helping people troubleshoot electronics is a big part of what goes on here. Last edited by budm; at Actually, this photo looks more like my board see brown area on the left side: Find More Posts by fzabkar. From this thread, seems like I should replace the transisors mounted on the heatsinks and test the diodes in this area.
You have to check datasneet on the dxtasheet to see if datashwet are close enough. There is a burnt electronics smell with the tv on. Only the Diode settings shows signs of life as described above. Originally Posted by stormy