Sony audio system DHC-MDX10 no sound

Vick · Joined: 23 Aug 2009 Posts: 3 Location: Mexico

I have an Audio system Sony DHC-MDX10 that suddenly lost the sound, all functions are fine but there is no audio. I replece a resistor (fusible) R881 that blown, but it works only a few seconds and again the fuse blowns and the souns is gone.

Guest · Posted: Mon Aug 24, 2009 5:39 am Post subject:

Why don't you check diodes D907, D908, D909, D910, capcitors c906, c907 and c956 on the main board.

Vick · Joined: 23 Aug 2009 Posts: 3 Location: Mexico

Hi again...

I´ve chequed that bridge and capacitors ad seems to be fine, I´ve followed the diagram from the line of the fuse, but I can not find the fault...

minnie · Joined: 18 Aug 2005 Posts: 2880 Location: Hell

Do you have the schematic? What does R881 protect?

Vick · Joined: 23 Aug 2009 Posts: 3 Location: Mexico

yes I have the service manual, I´ve downloaded from:

http://eserviceinfo.com/index.php?what=search2

The line of the R881 fuse goes to a couple of voltage regulators tha forms lines of B+ for diferent circuits, but I can not find the relationship with te lost of sound.

here is part of the diagram that shows what R881 protect:

minnie · Joined: 18 Aug 2005 Posts: 2880 Location: Hell

This is half assed I haven't fixed a stereo in years, I'd suspect one of the regulators is taking the resistor out. Seeing as resistors are cheap I'd pull IC903 out and see if it still blows the resistor, then IC901, then Q909. I'd suspect either the 12 or 7 volt regulator...

Guest · Posted: Thu Sep 03, 2009 4:37 am Post subject:

Maybe the T881 transformer is bad.

Guest · Posted: Thu Sep 03, 2009 4:52 am Post subject:

Is there an error history, error code on your unit as described on page 3 and 4 of the service manual of HCD-MDX10?

miras · Guest

i have the same son of a gun problem please help