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Post by tokejo on Feb 17, 2014 21:04:12 GMT -5
The unit would start up, ask me to wait for about 15 seconds and then shut down.
I checked the finals and one of the two transistors was bad (D2390).
I removed the two transistors in the channel and it stays on.
Didn't check it with audio yet, but I assume that's good now.
This has the same transistors as the Pioneer which I'm kicking myself now for not ordering spares, but that lead me to diagnose the three remaining receivers.
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Post by tokejo on Feb 18, 2014 13:26:30 GMT -5
I'll check all the resistors and (zener) diodes on that channel. Fortunately I can compare them to another channel.
Are there any I should pay special attention to?
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Post by mastertech on Feb 18, 2014 13:43:47 GMT -5
I am having a problem finding a manual for this model which is why I have not responded yet. Not sure if I will have success so we may have to use the 2 to diagnosis both. If this one now works both audio and video with those fets clipped out, you may want to try swapping boards from the other one to see which board is causing the no audio/video. Like maybe start with the HDMI board.
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Post by tokejo on Feb 18, 2014 14:06:22 GMT -5
That's fine with me. This model is a lot easier to swap boards than the Onkyo. I'll start that tonight after I confirm I have audio/video on this unit.
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Post by tokejo on Feb 18, 2014 14:09:01 GMT -5
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Post by mastertech on Feb 18, 2014 14:35:35 GMT -5
It looks correct.
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Post by tokejo on Feb 18, 2014 15:51:15 GMT -5
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Post by mastertech on Feb 18, 2014 16:24:46 GMT -5
Ok, for surround right you want to check:
R5419 and R5421, 0.47 ohm, you have to lift 1 leg to test because parallel.
R5420 and R5422, 0.47 ohm, "same as above"
ZD5402 and ZD5404
D5403 and D5405
Q5404, Q5410,Q5402 and Q5404
R5415 and R5416, 5.6 kohm
R5417 and R5418, 4.7 ohm
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Post by tokejo on Feb 18, 2014 16:50:54 GMT -5
Yes, it is the SR channel, forgot to mention that earlier. I'll take a look tonight.
Thank you.
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Post by mastertech on Feb 18, 2014 16:52:51 GMT -5
It is in the title. I was just double checking.
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Post by tokejo on Feb 18, 2014 18:28:13 GMT -5
I don't know what's different, but now the unit won't stay powered on.
All I did was plug it in - it tries to power on without pushing the power button (different from the other unit) and then powers off after about 5 seconds.
Yesterday it would stay powered on.
I hadn't done anything to the unit since yesterday.
After I saw this I pulled out the HDMI board and tried it in the other unit.
I did not try the other HDMI board in this unit.
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Post by mastertech on Feb 18, 2014 18:57:12 GMT -5
You need to check the list of parts I gave you above. A failed part, even with those FET's clipped can put some voltage on the output line and will cause it to shut down.
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Post by tokejo on Feb 18, 2014 19:41:39 GMT -5
Ok, multiple parts are bad. Still need to check R5419/R5421 and R5420/R5422
ZD5402 - 989/OL - Labeled D5402
ZD5404 - OL/OL - Labeled D5404 - Bad?
D5403 - 794/OL
D5405 - 000 - Bad
Q5404 - Good
Q5410 - Did you mean Q5401?
Q5401 - Bad - scorched
Q5402 - Bad - scorched
R5415 - after 60 seconds it had climbed to 4.59k
R5416 - same as R5415 ~4.6k after 60 seconds
R5417 - 4.7 ohms
R5418 - OL
Other components
R5410 - 719 Ohms - Was near a scorched component
R5405 - 1143 Ohms - Was near a scorched component
Q5403 - Reads ~1100 whereas other channels read ~910 - also scorched
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Post by mastertech on Feb 18, 2014 19:59:03 GMT -5
Ok, multiple parts are bad. Still need to check R5419/R5421 and R5420/R5422 ZD5402 - 989/OL - Labeled D5402 ZD5404 - OL/OL - Labeled D5404 - Bad? Recheck after remove bad parts.D5403 - 794/OL D5405 - 000 - Bad Yes, bad. removeQ5404 - Good Q5410 - Did you mean Q5401? Meant Q5403Q5401 - Bad - scorched RemoveQ5402 - Bad - scorched RemoveR5415 - after 60 seconds it had climbed to 4.59k Lift 1 leg if required. 5.6kohmR5416 - Couldn't find Is in series with R5415. 5.6 kohmR5417 - 4.7 ohms R5418 - OL Bad. RemoveOther components R5410 - 719 Ohms - Was near a scorched component 47ohms Recheck after removal of bad parts.R5405 - 1143 Ohms - Was near a scorched component ""Q5403 - Reads ~1100 whereas other channels read ~910 ""May end up having to test all resistors in this circuit since there seems to be a lot of damage. Start removing bad parts. After bad parts are removed try turning it on again and see what happens. |
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Post by tokejo on Feb 18, 2014 20:06:50 GMT -5
I won't be able to do much more tonight.
Remote is programmed though.
Hopefully I'll have more time tomorrow.
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