Hi guys!
Got this Onkyo monster with a defect - it has no sound through speaker outputs as well as headphones (previously stated as fully working). Okey, thought it is a common problem of DTS IC or its firmware as the all others I have repaired before. Carefully inspected DSP IC, seems to be changed to the newest version (with a letter "D") and all FWs show OK.
Started troubleshooting with a DMM and scope.
Checked signal path and the signal is missing just after Q5501 - R2A15220FP - Input MUX IC. Checked before caps C5600 and C5601 so that Mute does not affect signal (if such is present). Voltage rails are OK, though (Please refer to the chematics part presented below).
https://ibb.co/kX1TsSw
How likely this IC is damaged? Have anyone had such experience where R2Axxxxx Input Selector was defective?
Looking forward to hearing!
Got this Onkyo monster with a defect - it has no sound through speaker outputs as well as headphones (previously stated as fully working). Okey, thought it is a common problem of DTS IC or its firmware as the all others I have repaired before. Carefully inspected DSP IC, seems to be changed to the newest version (with a letter "D") and all FWs show OK.
Started troubleshooting with a DMM and scope.
Checked signal path and the signal is missing just after Q5501 - R2A15220FP - Input MUX IC. Checked before caps C5600 and C5601 so that Mute does not affect signal (if such is present). Voltage rails are OK, though (Please refer to the chematics part presented below).
https://ibb.co/kX1TsSw
How likely this IC is damaged? Have anyone had such experience where R2Axxxxx Input Selector was defective?
Looking forward to hearing!
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