Well known and documented problem with Onkyo receivers is when unit powers up but, has no speakers displayed on the front panel and no sound. At this moment it is also impossible to read a version of DSP firmware. Some units will have sound after long warm up and some won’t. In our case it is TX-NR809.
Unit on our bench came from the other repair shop and we will try to help them to repair it.
First, we remove the top cover and perform quick over all check.
Next, locate Q3001 chip with DTS logo on it on the digital (HDMI) board. With the heat gun on a low setting (temperature of the chip should never exceed 200C!), warm the chip for one minute applying heat 5 sec on 5 sec off. Let it sit for 15 sec then power up the unit.
If the receiver displays speakers on the front panel and has sound, we found the problem. To resolve it, we will have to re-solder Q3001. For long lasting results, BGA re-balling procedure is necessary. That’s how it’s done.
Remove Digital board from the unit.
Apply kapton tape around the chip.
Place the board on BGA rework station and remove the chip.
Clean up the board and the chip.
Re-ball the chip.
Place the chip back on the board.
Place the board on BGA rework station and solder the chip.
Clean the board.
Place the board back into the receiver.
Test the receiver.
This is an example of how BGA rework can save your unit from becoming a boat anchor.