Question about Sony STR-DE715 Receiver
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Posted on Jan 02, 2017
SOURCE: Sony STR-DA5300ES Audio Problem
I am posting this to try and get everyones audio problem for this receiver fixed. If you only connected the HDMI cable to the 510, you will not get sound. This receiver passes through HDMI only, no processing of audio. You must either connect a fiber optic or digital coax to the 510 for that respective HDMI input from the BD player, the DVD HDMI only accepts digital coax, and the Video2 HDMI only accepts fiber optic. If you BD player does not have digital coax out for audio, you must move the connection to Video2 HDMI and connect fiber optic to the Video2 fiber input. Sony butchered the whole purpose of HDMI with this receiver. Hope this heps you. By the way, it is hardware, no firmware update will correct this.
Posted on Jan 27, 2008
I had this problem last night.
To solve it, you can reset the amp by:
1) Put the receiver on stand-by
2) Hold down "MODE" button and press on button
3) "S.F. CLR" appears in the display and surround is back on.
Posted on Feb 10, 2009
There is a 2.3A 125V fuse on the power supply board you will need to replace. Radio Shack has them for about $3 for a bag of 4, however, they are 2.3A 250V fuses. The difference in voltage will not matter. Remove the top of the unit and you will find the power supply board down in the back left hand corner. The power cord feeds into it.
Posted on Dec 03, 2009
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.
AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier have some problem. there are five amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
I have the service manual for the same. if you need the same will sent it to you. For that i need your email id. As it is a large pdf file can't sent through fixya.
Posted on Jun 13, 2011
Testimonial: "Thanks very much. Shame that is the case. Quite an expensive item. Looks as though it leaves no alternative but to throw away. Help appreciated."
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