I would try and get a better one. Single channel, looks out of focus... avoid.
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When the device gets hot localised hot spots form on the die itself. These hot spots tend to hog all of the current due to their lower resistance. The lower resistance leads to more current through that part, and more heat. More heat makes them have an even lower resistance. You can see the cycle. If unmanaged, it becomes self-destructive and the hot spots become short circuits, which causes the device to fail short circuit.
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I see, so the initial problem would be excess current? Thus starting the cycle and eventually short circuiting it.
For the new MOSFET I just replaced in my Ysus, I only turned the TV on and off for only less than seconds and the drain-source easily shorted. Can a nearby shorted resistor be the cause of this?
Ill try and describe what he replaced- as you are looking at the board from the angle where the component of mine had a hole burned in it- The component itself (the one you pictured) plus a small flat onboard (resistor?) next to it and the right hand FET on the heat sink right above the hole-burned component. There is a kit on ebay to repair and it looks like he did about 1/2 of what that provides. http://www.ebay.com/itm/LJ92-01490A-...item3f123998c4
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What is the input rating of the scope? e.g. 250V, will be written on the front near the input connectors.
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OK, so you can use those probes safely. You should use the 10X setting for plasma sustain boards, but at least switching over to the 1X setting won't damage the scope. Otherwise, if the limit were closer to 300V, I would have recommended a fixed (not switchable) 10X probe.
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K, probe here. Set your probe to 10X. Attach the probe hook (supplied in the packet) to the probe end, and attach the hook to one end of the red poly cap, away from the screw. Connect the ground alligator clip to the side of the screw.
Note: This is for testing with buffers installed. Is that what you want to do?
Attached Files
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Is there a way to test the Ysus without the buffers installed? The last time I installed all three boards and turned on the TV, the new 88N30W Mosfet I just replaced shorted from drain-source. I just replaced the mosfet again, i don't want to blow it again.
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