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minnie |
Posted: Sun Jan 28, 2007 8:58 pm Post subject: |
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To test the transistor you have base, collector, emitter. With it out of circuit, you don't have to, you should get a high/low from base to collector and high/low from base to emitter. The collector to emitter should read a short/0 ohms. High/low means you should get say meg one way then read it again reversing the meter leads on the same legs. If it's shorted you'll know. |
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minnie |
Posted: Sun Jan 28, 2007 7:59 pm Post subject: |
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ccallebaut wrote: |
Are you sure it isn't the Q503? IS the flyback the component with the 12guage wires running from it? In addition, how would I go about testing the Q501? |
Yes. |
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ccallebaut |
Posted: Sun Jan 28, 2007 7:56 pm Post subject: |
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Let me repost that last post because it made absolutely no sense. I was switching back and forth from the circuit diagrams - my apologies. In any case, I was wondering if the flyback was the component with the thick red wires leading into the HV divider. And finally, how do I go about testing the Q501? |
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ccallebaut |
Posted: Sun Jan 28, 2007 7:41 pm Post subject: |
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Are you sure it isn't the Q503? IS the flyback the component with the 12guage wires running from it? In addition, how would I go about testing the Q501? |
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minnie |
Posted: Sun Jan 28, 2007 4:51 pm Post subject: |
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2 things to try. Unplug CN007. It's a snap connector. See if the set comes on but convergence is off. Middle board top right corner. I believe Q501 is the h out. Should be near the flyback on a heat sink. See if it's shorted. |
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minnie |
Posted: Sat Jan 27, 2007 12:01 am Post subject: |
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Then it doesn't sound like any of the TDA6111Q's are bad. It's something else. Check the horizontal output transistor to see if it's shorted. |
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ccallebaut |
Posted: Fri Jan 26, 2007 5:59 am Post subject: |
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The green power light comes on with CN00A unplugged then dies. The green power light comes one with CN00A plugged in as well. What does that mean? |
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minnie |
Posted: Fri Jan 26, 2007 12:15 am Post subject: |
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ccallebaut wrote: |
The thing that scares me is that I can't get any of the projectors to fire up when testing them. I would really like to know where this CN3GBN is located or at least what it looks like? I reviewed pattern diagrams and found nothing that matched that description. Would I have to replace all three TDA6111Q's? |
No. With CN00a unplugged it removes the 215 volts to the crt board. Normally when the ic failed you hear a clicking from the relay on the middle board. When you unplug CN00a if the set comes on and the green lite comes on when it didn't before you've confirmed one of the ic's is bad. |
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ccallebaut |
Posted: Thu Jan 25, 2007 5:25 am Post subject: |
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The thing that scares me is that I can't get any of the projectors to fire up when testing them. I would really like to know where this CN3GBN is located or at least what it looks like? I reviewed pattern diagrams and found nothing that matched that description. Would I have to replace all three TDA6111Q's? |
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minnie |
Posted: Thu Jan 25, 2007 5:09 am Post subject: |
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CRT board. On the heat sink. |
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