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Post by u2nmg93 on Sept 1, 2017 16:12:35 GMT -5
Main relay engages but still no life on the display. The 12v jumps to 16.5v once the relay clicks.
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Post by mastertech on Sept 1, 2017 17:33:55 GMT -5
With the jumper in place and receiver plugged in, see if you have 120vac at P9002 on the PS board. If you do then unplug the receiver and unplug connector at P9002 and do an ohm test on the transformer primary winding to make sure the thermal fuse in the transformer is not blown.
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Post by u2nmg93 on Sept 5, 2017 10:25:08 GMT -5
Have 120vac at p9002 and the thermal fuse is still good, reads around 1ohm.
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Post by mastertech on Sept 5, 2017 18:14:14 GMT -5
Ok. looks good. So I guess we can move on to finding the problem. On the HDMI board locate Q7018 and test for 3.3vdc on pin 5. You can use pin 2 for gnd. Or just test across C7038.
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Post by u2nmg93 on Sept 6, 2017 15:39:59 GMT -5
I've got 3.3vdc across C7038 with the jumper still in place and without.
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Post by mastertech on Sept 6, 2017 18:42:48 GMT -5
Is Q7009 accessible to test on the pins while still assembled and powered?
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Post by u2nmg93 on Sept 7, 2017 8:13:32 GMT -5
Yes, it's on the top of the hdmi board.
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Post by mastertech on Sept 7, 2017 11:38:35 GMT -5
Start with pin 9 for 3.3vdc. If good then test pins 129 and 130.
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Post by u2nmg93 on Sept 8, 2017 12:25:15 GMT -5
Pin 9 I have 2.5vdc and Pin 129 and 130 I have 2.7vdc
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Post by mastertech on Sept 8, 2017 14:06:58 GMT -5
Interesting that you only have 2.5v on pin 9 yet you had 3.3v on Q7018, pin 5. locate L7007 and test voltage on both sides.
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Post by u2nmg93 on Sept 8, 2017 14:56:21 GMT -5
Went and rechecked. Have 3.3vdc on both sides of L7007, at pin 9, 129, and 130 on Q7009. I was off one pin last time on 9 and a few on 129 and 130. Checked it at the next component in line this time as well (C7019, R7026, and R7025). If that gives a false reading let me know, it's a lot easier than trying to isolate the pins on the IC.
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Post by mastertech on Sept 8, 2017 15:14:02 GMT -5
That reason I like you to test right on the ic pins is because it eliminates the possibility of a broken line or bad solder joint. But I also recommend you have a nice sharp point on your test probe so it does not slip while you are testing with the power on and short something out.
Test voltage on pin 126.
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Post by u2nmg93 on Sept 8, 2017 16:14:08 GMT -5
0v on pin 126 and at R7030 (just to make sure I had the correct pin.) Makes sense to test at the ic pin and like you said you need a very sharp point on the lead to make sure you're only testing one pin.
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Post by mastertech on Sept 8, 2017 16:36:30 GMT -5
Test it again and press the "power on" button while testing and see if the voltage comes up.
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Post by u2nmg93 on Sept 9, 2017 15:09:17 GMT -5
No change when pushing the power button or any other source button. Still 0vdc
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