Question about Sony STR-DA3ES Receiver

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Receiver misinterpreting IR signals

My Sony STR-DA3ES receiver began misbehaving several months ago. It seems to be misinterpreting IR signals from a variety of remotes, including its own, two different Sony DVD player remotes, a Samsung DirecTV receiver remote, etc. The result is the same; the STR-DA3ES switches input to Video 1. For example, I can press the "cursor" buttons on a DVD player remote to make menu selections on-screen, and at a seemingly random button press, the receiver's input will change to Video 1. In all other respects, the receiver is functioning normally.
I've dug around for any info about this problem and have found none. If there's any way to resolve this problem, I'd appreciate the help.

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  • Grouchicarpo Apr 09, 2008

    Thank you for that info. At my own peril, I've disassembled the front of the receiver. :) The solder joints for the IR unit look clean, and the IR receiver itself (labeled IC101 on the board) does not appear to have any external damage or problem with its pins.

    I've looked around the board for components labeled similarly to C124. The only ones I see with soldered-in components are C122 - C125, which are all *under* the main LCD. So I can't get to them. Around the IR receiver itself are two spots without components labeled C109 and C110. The only other components around the IR unit are a couple of capacitors and the Power push button. However, since I'm not certain what the digital switch looks like, I could be overlooking it.

    Thanks again for the suggestions.



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There can be a few causes of this. Since it happens with a number of remotes, we can state that the problem is inside the receiver. In the front of the receiver (inside) you should see a small silver box. Inside that is the InfraRed receiver. This is a 3 pin device. Check to be sure that the pins have good solder joints. A bad joint can cause problems. Also, after the receiver comes what is called a digital switch. This is similar to a transistor except that it makes the transitions more steep, like a step rather than a ramp. If this part is bad you can get these results. The digital switch will be marked c124 (perhaps or somehting close).
Check these out and keep us posted.

Posted on Apr 09, 2008


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