Home Theater Questions? Ask a Technician for Answers ASAP
Hi Sid, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, a little more background info please:
Additionally confirm; performing a a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?
Great on the DIY!
Proposed preliminary checks (if have not been done) on suspects:
A friendly reminder; voltage measurements by its very nature requires that the Onkyo be plugged in and therefore LIVE! Please exercise due care and caution.
The "...T901 change to P901B - P904A = 4.4k..." appears to be high.
Please check the voltage across C913.
Sid, it would appear that the issue would be with the standby voltage at C913 as it appears to be very low with a 4.3V reading. I was expecting something like 10~12VDC. Do you have a 12V power supply? ....that we can use to test
Yes please. (I sometimes use the power supply of an old desktop computer as it has several output including +5 and +12.)
Should do the job.
Another firendly reminder; observe correct polarity.
That would be the no load voltage.
First disconnect connector from main transformer T911 and the connector to JL901B.
Then feed this 12V source to the pins of C913.
Then measure again the voltages above posted.
I normally use alligator clips with wires similar to the products shown HERE.
Yes on the RLGND but perhaps you meant cathode of D906.
Depending on the version, JL901B may be plug in or soldered.
But we can try even with it still tied to the board.
Sorry, no board layout just the schematics so could not suggest alternative test point.
And yes R906, R909, D906 all would serve as tap point to inject the external +12V.
I understand and no prob; later when able.
Please do a Ctrl + D to bookmark this page or click on the link sent by the site.
I would be prompted soon as you post an update.