I went to play a DVD in my system and suddenly the screen went blank and the system itself started showing C-81 and now I cannot get the DVD out or the slide tray to open. Any ideas on how to fix this problem???
Sony DAV-S500 error c-81:
On the rear side of the DVD board connected to the DVDv drive is a power transistor Q002 that is shorted BASIS-EMITTER.
The device is an Toshiba 2SA1213Y (PNP transistor 1$)
Replace and your DVD works!
good luck :)
Foxi from Budapest, Hungary, Europe
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If the problem returns with connection of the sub it may be defective or on its way out. Internal damage to the voice coil from being overdriven could have melted or worn through the insulation and it would cause intermittent undesired electrical contact or load variation under certain conditions, like high volumes.
If your speaker level settings are unusually boosted for the sub you may be overdriving it.
The DVD Upgrade is an advanced modification to your DVD player, which adds extra features and enables you to get more from your machine. The upgrade supplements the DVD player and in no way harms the playback quality or removes any performance features of the machine.
The following DVD players are supported by this version of the DVD Upgrade:
Sony DAV-C700 Sony DAV-S400 Sony DAV-S500 Sony DAV-S800 Sony CMT-S9D
Macrovision & CGMS disable
All DVD players have a system called Macrovision built in to the player, which is designed to stop the copying of DVD discs to video. However, this system can have adverse affects on some projectors. For this reason the DVD MOD Upgrade disables Macrovision to solve any problems.
Put your player into „Standby“ Mode and enter one of the following commands if necessary:
Remote control command Function  [ENTER] Default Default region code on the player  [ENTER] Region 1  [ENTER] Region 2  [ENTER] Region 3  [ENTER] Region 4  [ENTER] Region 5  [ENTER] Region 6  [ENTER] Region 7  [ENTER] Region 8 [Arrow down] [ENTER] Only play DVDs with the selected region; auto switching OFF [Arrow up] [ENTER] Default Auto switching ON [PREV I<<] [ENTER] Enable video interference impulses (Macrovision ON) [NEXT >>I] [ENTER] Default Disable video interference impulses (Macrovision OFF) [Arrow left] [ENTER] Enable user operation prohibitions* and access restrictions [Arrow right] [ENTER] Default Disable user operation prohibitions* and access restrictions
* The DVD can no longer prohibit you from using the fast-forward, chapter change or Audio-/Subtitle-/Angle switch. You can no longer be forced to watch intros. Just press [TITLE] or [DVD MENU] and select PLAY.
Hi, First try with yellow video output of DAV-S500 in yellow video TV input to get its picture. (yellow output means composite video out) Green-Blue-Red video output is component output that will be turn on when you switch the unit into Progressive picture mode, that option would be available in Menu of DAV-S500 Hope this info will help you. Thanks.
A bizarre coincidence but our Sony DVD player DAV C700 did exactly the same when the kids were watching a DVD. All other functions on the system are still working but the DVD player wll not eject or play - and the self diagnosis function C 81 remains illuminated on the display.
The protect indication is because of a fault detected in the amplifier section. If this appeared occasionally before and cleared itself, it suggests bad connections. If you know how to solder, open up the unit and resolder any connections that appear grainy or have rings. That may solve the problem.