SocialistCharizard
New Member
Hello,
Today I acquired a Sony HCD-C770 5 disc DVD changer/mini amp that is non-functional. When I power it up, the standby light just flashes repeatedly and the machine refuses to do anything.
Upon checking the internet, I found forum threads discussing a certain electrolytic capacitor that is known to fail and cause this issue. The forum threads referred to capacitor C914 on the power supply board, so I disassembled the machine, found the capacitor in question, and de-soldered it.
My issue is in finding a replacement with the proper voltage, as there seems to be some discrepancies on what voltage capacitor should be used. The forum threads point to either a 47uF 35v capacitor or a 47uF 50v capacitor. Sony's service manual for the HCD-C770 (https://www.manualslib.com/manual/800088/Sony-Hcd-C770.html?page=136#manual) lists C914 as having a max voltage of 50v, which led me to assume the 50v capacitor is the correct one. However, when I removed the cap from the actual machine, I noticed it was actually a 35v cap. This was extremely confusing, as the service manual is telling me the capacitor should have a different voltage than what was actually in the machine.
I then noticed that there were lots of scratches on the inside of the upper case half. This could have been my doing from when I removed it, however, if it was someone else that did this, it would explain why the capacitor voltage was wrong. Someone could have attempted a previous repair on this machine and carelessly put a capacitor with the wrong voltage without consulting the service manual. However, this is also contradicted by how the machine still is able to power up to some extent (as it is essentially giving me a boot time error) and how there is no visible damage anywhere else on the power board or on the capacitor itself. If an electrolytic capacitor with an incorrect voltage was put into the machine, it surely would wreck the power board further or at least produce signs of over-voltage stress on the cap itself.
I'm kind of stuck at this point, as I have multiple contradicting factors here. As of now I have ordered both a 35 and 50 volt replacement capacitor (I got both because of convenience and a low price). I'm just wondering what others think about this, since I'd really like to get this machine up and running. This is also the first time I have actually replaced a component on a board (I've re-soldered wires and de-soldered components before but that's about it), so I want to make sure I'm not going to blow up anything or shock myself due to putting in incorrect components.
Today I acquired a Sony HCD-C770 5 disc DVD changer/mini amp that is non-functional. When I power it up, the standby light just flashes repeatedly and the machine refuses to do anything.
Upon checking the internet, I found forum threads discussing a certain electrolytic capacitor that is known to fail and cause this issue. The forum threads referred to capacitor C914 on the power supply board, so I disassembled the machine, found the capacitor in question, and de-soldered it.
My issue is in finding a replacement with the proper voltage, as there seems to be some discrepancies on what voltage capacitor should be used. The forum threads point to either a 47uF 35v capacitor or a 47uF 50v capacitor. Sony's service manual for the HCD-C770 (https://www.manualslib.com/manual/800088/Sony-Hcd-C770.html?page=136#manual) lists C914 as having a max voltage of 50v, which led me to assume the 50v capacitor is the correct one. However, when I removed the cap from the actual machine, I noticed it was actually a 35v cap. This was extremely confusing, as the service manual is telling me the capacitor should have a different voltage than what was actually in the machine.
I then noticed that there were lots of scratches on the inside of the upper case half. This could have been my doing from when I removed it, however, if it was someone else that did this, it would explain why the capacitor voltage was wrong. Someone could have attempted a previous repair on this machine and carelessly put a capacitor with the wrong voltage without consulting the service manual. However, this is also contradicted by how the machine still is able to power up to some extent (as it is essentially giving me a boot time error) and how there is no visible damage anywhere else on the power board or on the capacitor itself. If an electrolytic capacitor with an incorrect voltage was put into the machine, it surely would wreck the power board further or at least produce signs of over-voltage stress on the cap itself.
I'm kind of stuck at this point, as I have multiple contradicting factors here. As of now I have ordered both a 35 and 50 volt replacement capacitor (I got both because of convenience and a low price). I'm just wondering what others think about this, since I'd really like to get this machine up and running. This is also the first time I have actually replaced a component on a board (I've re-soldered wires and de-soldered components before but that's about it), so I want to make sure I'm not going to blow up anything or shock myself due to putting in incorrect components.