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Post by u2nmg93 on Oct 9, 2017 21:29:59 GMT -5
Receiver shows no signs of life, gave up on it a while back. All the fuses are good, transformer checks out, I have 12v into the hdmi board at connector P9011B, only thing I noticed was that Q8961 gets hot to the touch. I have no voltage at Q7018. Not sure if that matters or where to go from there. If you need a copy of the service manual PM me.
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Post by mastertech on Oct 10, 2017 9:13:53 GMT -5
Where is Q8961? I am not seeing it on the schematic.
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Post by u2nmg93 on Oct 10, 2017 10:17:01 GMT -5
Page 23 shows it on the actual board, it's slightly up and right from connector P9011B. On the schematic p53 it's to the right of Q8701.
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Post by mastertech on Oct 10, 2017 10:45:09 GMT -5
Ok, got it. Well don't know yet if they are related so you can check both. Test DC voltage on Q7018, pin 1,3,5.
Check dc voltage on Q8961, pins 2,3.
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Post by u2nmg93 on Oct 10, 2017 11:55:30 GMT -5
Q7018 I have 0vdc on all pins, on Q8961 I have around 1vdc on pin 2 that's pulsing and Ov on pin 3.
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Post by mastertech on Oct 10, 2017 12:07:32 GMT -5
test voltage both sides of L8961.
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Post by u2nmg93 on Oct 10, 2017 12:23:51 GMT -5
Was pulsing on both sides, I unplugged it and plugged it back in and now it reads 12v on both sides of L8961 and 12v at pin 2 0v at pin 3 on Q8961. Maybe I shorted something testing it? Receiver still won't turn on...
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Post by mastertech on Oct 10, 2017 13:02:40 GMT -5
Is Q8961 still getting hot?
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Post by u2nmg93 on Oct 10, 2017 14:23:34 GMT -5
Yes it is.
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Post by mastertech on Oct 10, 2017 14:32:25 GMT -5
Remove L8962 and recheck voltages of Q8961, pins 2,3 and 7.
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Post by u2nmg93 on Oct 10, 2017 15:04:46 GMT -5
After removing L8962 on Q8961 pin 2 12v pin 3 0v pin 7 5.3v and it is still getting very hot.
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Post by mastertech on Oct 10, 2017 16:06:13 GMT -5
Well I am not happy finishing this test with the feedback line disconnected but if it is still getting hot then I would say it is most likely bad. I would also do an ohm test across C8967 with the unit unplugged just to make sure something didn't short it out. If the ohm test is real low then I would remove Q8961 and redo the ohm test.
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Post by u2nmg93 on Oct 10, 2017 20:49:35 GMT -5
C8967 is reading around 4.4 kohm still need to remove Q8961?
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Post by mastertech on Oct 11, 2017 8:23:05 GMT -5
That looks ok. Replace Q8961.
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Post by u2nmg93 on Oct 13, 2017 13:48:28 GMT -5
Replaced Q8961, receiver is still dead, but IC isn't getting hot anymore. On Q8961 pin 2 11.6v pin 3 0.3v pin 7 5.6v
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