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Post by dolivas27 on Mar 26, 2015 0:32:01 GMT -5
Ok I have a Denon AVR-689 it has NO sound it powers up fine with no errors.
I have tested all the outputs for shorts and there are none.
I have used the analog input still no sound.
I also have no sound on the head phone jack.
Looking for some direction what to test next. I have the service manual if needed,
Thanks,
Dean
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Post by dolivas27 on Mar 26, 2015 2:24:00 GMT -5
Ok I have a Denon AVR-689 it has NO sound it powers up fine with no errors. I have tested all the outputs for shorts and there are none. I have used the analog input still no sound. I also have no sound on the head phone jack. Looking for some direction what to test next. I have the service manual if needed, Thanks, Dean Ok Guys & Gals I think I have found the problem it looks like IC1001D Part# KIA78R33PI is bad. I see the 5v in to the regulator and no 3.3v out so it looks like the DSP is not getting any power. Now the big questions is there a cross for the KIA78R33PI part I looked and it looks like I will have to order one from China..... |
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Post by dolivas27 on Mar 26, 2015 2:50:52 GMT -5
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Post by mastertech on Mar 26, 2015 11:01:46 GMT -5
I don't like what I see in that KA replacement but the NJM looks fine. |
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Post by dolivas27 on Mar 26, 2015 11:12:04 GMT -5
Ok I will order the NJM what is it you don't like so I will know for next time.
Thanks
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Post by dolivas27 on Mar 29, 2015 9:15:13 GMT -5
Ok looks like the 3.3 volt regulator was not bad it is the HDMI board that is bad.
The unit works and has audio if I remove the power to CP404 on the HDMI board. The HDMI board has a short in it. I have tried to track it down but not having any luck it could be in IC01.
CP404 has the 3.3v and GND for the HDMI there is a dead short from the 3.3v and GND.
If anyone has any ideas where to look on the HDMI board let me know I have the shield's off the board and have removed some components trying to track down the short.
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Post by mastertech on Mar 29, 2015 14:11:14 GMT -5
Well it looks like the only possible culprits are a regulator, a diode, a bunch of caps or the main ic. What parts have you removed to test so far?
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Post by dolivas27 on Mar 29, 2015 15:59:27 GMT -5
Well it looks like the only possible culprits are a regulator, a diode, a bunch of caps or the main ic. What parts have you removed to test so far? C24, C25, C28,C29, C30 IC03, Q07, Some of the caps had a High ESR but even removed the short is still there. D44 was removed and tested Good. With IC03 Off I get a Dead short on the input to ground I also removed one resistor R10 it is on HDMI 2 out the value is way off. |
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Post by mastertech on Mar 29, 2015 17:17:13 GMT -5
Yeah, looks like you are on the hunt. It wouldn't be the first time I had a bad HDMI switching chip. I have changed many plus receiver and transmitter chips.
2 things you can try. Set DMM on diode scale, neg probe on gnd line and drag the pos probe along the pins of ic01. If a lot of pins appear to be shorted to gnd then the chip is bad.
But, just to be sure it is not just a decoupling cap, I would take a +5v wall wart supply and wire it into that 3.3v connector. When you plug it in, something is going to get real hot. You can feel around to find it. If it ends up being the ic then you could remove it to verify the short goes away. Just don't leave the wall wart plugged in to long or it might damage it. I have so many buckets full of them it doesn't matter when I do it but I have not lost one yet. Oh. make sure nothing else is connected to the board when doing the testing.
If it does end up the chip gets hot you can just lift the feed line pins first to verify if you don't want to remove the whole chip. Feed pins would be 23,43,55,63. Also. R28 would also be tied to the main ic.
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Post by dolivas27 on Mar 29, 2015 18:53:25 GMT -5
Ok i will check that when I get home went to check on my parents. if i remember right I did check the IC and it did have a lot of shorts to ground. But I will recheck when home I get home. If the chip is bad can it be ordered?
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Post by mastertech on Mar 29, 2015 19:34:17 GMT -5
Yes. There appears to be many available on Ebay. Have you ever done a chip like this. How do you remove?
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Post by dolivas27 on Mar 29, 2015 22:59:29 GMT -5
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Post by mastertech on Mar 30, 2015 0:14:35 GMT -5
Nice. Have you verified the chip yet?
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Post by dolivas27 on Mar 30, 2015 1:13:05 GMT -5
Nice. Have you verified the chip yet? Not yet I just replaced everything on the board I had removed and installed new caps in these locations C24, C25, C28,C29, C30 They were bad and I had some on hand. Need to re-install the D44 diode then I will be ready to test. You want me to apply 5v on the 3.3v CP404 HDMI connector right? Also I did check the chip and all the AVcc33 & AVcc18 pins are shorted to ground? All other pins seem fine. |
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Post by dolivas27 on Mar 30, 2015 5:24:35 GMT -5
Applied the 5v and the only thing I thought was getting hot was IC01 it never got really hot just warm.
So I removed the chip (IC01) and the short is gone! Applied the 5v and the 1.8v LDO is outputting 1.8v so it looks good.
Now I need to figure out the best source for the chip and order a replacement resistor for R10 I removed it because it was measuring out of range and lost it. HAHAHA
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