Question about Audio Players & Recorders
The AVR have problem in its pre amplifier stage. Normally this type of cracking noise will hear because of faulty op amp (operational amplifier) ics. To repair such problems you should have through knowledge in electronics. And also need SMD rework stations Beacuse all the op amp ics are SMDs. If yo have such knowledge then i have added here the link to the service manula for your AVR.
Refer the page number page number 13 first. Its the Audio section blaock diagram of the AVR. you can see the the suspected ic in the top right corner marked as IC410. Which is the pre stage op amp for the frond left righ amplifier. You have to replace this ic( integrated circuit).
You can find the position of the ic by refering Page number 27. Its the input board . On the board you can see three ics with 8 legs(four in each side) On the left side. You have to replace the ic marke as IC410. You can find the schematic for the input board in page number 26. the The part number of the ic M5218AFP-T .
Refer the sevice manual to know how to carefully to remove the input baord.
If you need any more assistance feel free to conatct me through fixya.
Posted on Feb 09, 2012
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Posted on Jan 02, 2017
SOURCE: Sony amp str-db940 - protection
Somewhere in your speaker wiring, you have a shorted wire. This short can be as simple as a single strand of wire touching the other terminal on one of the speakers.
With a bright flashlight, look carefully at the back of the receiver and then the speakers for any loose strands.
Posted on May 27, 2008
You might have to go into the players setup and select the output and audio stream options. If it is set for PCM only it will not receive the Dolby or DTS signals if you selected them in the DVDs audio selection menu. There may also be a signal select in the Sony receiver to assign the digital inputs to selected units.
Hope this helps
Posted on Jan 01, 2009
discharge the output circuit! If you don't you will blow a 10 ohm resistor every time. I've worked on hundreds of these receivers I know. They need the output circuit soldered at the voltage driver ic's and quite possibly some capicitors replaced on the digital board. The caps mounted near the heat sinks dry up the fastest. These are nice amps. Larry's Electronics Sacramento Ca. email@example.com
Posted on Apr 24, 2010
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