Question about Bush Televison & Video
I have a new peronal dvd player - Bush PDVD0707 which has been in box for months. It will not play any of the discs I have tried, although they should all be compatible. I just get a message BAD DVD. I have checked all the settings. Any ideas? Thanks. Sandra
Posted on Nov 03, 2014
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Posted on Jan 02, 2017
SOURCE: Bad Disc
First determine where the problem lies. This can be done by analyzing what is happening. Is the disc spinning. Is it spinning erratically? If the disc is not spinning, the spin motor is probably defective. But sometimes you can be fooled, if the laser does not detect information of the disc, it will not issue a start spin motor command. If you can get the unit to work with the door open by defeating the switches,(Do not under any circumstances look directly into the laser)If you see the laser then the spin motor is bad, In either case the unit is is probably cheaper to replace than to repair. Scrivitron
Posted on Jun 20, 2007
This just worked for me. Don't know how long it will last though. I found it on this webpage
To do a reset:
On the remote control press the SETUP button,
Press the right key on the remote 3 times,
The Preference page will show up,
Press the down arrow five time to highlight
"default", hit right arrow to highlight "reset"
Press enter to reset. Turn off/on machine, etc.
Posted on Feb 14, 2008
Heating issue. If you remove the cover and touch the processor chip - you will not be able to keep your finger there for more than a second (that is if your really want to use this crude method to test the temp).
I have taken measurement and its around 50C. Thats a lot for no heatsink or cooling fan.
If you have the unit in a cabinet with no air flow - you will not be able to use this unit for more than 3 months and up to a year. Best to have it on top of a cabinet or in one with an open front and back to allow some airflow - or just anywhere where its in the open.
Samsung has another unit - the AR650, which I believe is discontinued - which for some strange reason has realized this concern. My guess its a whole different team of designers (or at least some folks with some brains) and added a cooling fan into the unit. Its the same exact case and motherboard as the 135, and 155. There are absolutely no issues with it rejecting disc's - even after a year of use for some users.
Solution 1 - Place it in the open
Solution 2 - Remove case and drill holes to the topside
Solution 3 - Remove case and add a fan
Solution 4 - Remove case and add a heatsink over proc (will still need to drill holes over heatsink..
Solution 5 - We can all complain to Samsung and have them recall the units
Posted on Aug 22, 2008
SOURCE: APEX AD-1115 DVD PLAYER
Manually cleaning the lens
To locate the laser lens, look around the door or drawer of the DVD player and you will see a small circular disc, which is often called the turntable or disc platter. Right off the edge of the platter you should see a small clear lens. There are some manufacturers that have had problems with the lens, depending on the age of the unit. In these problem players, moving the unit to a different location, turning the unit upside down, or sometimes even without moving the unit, the lens can become detached from the laser assembly and floats around inside the unit. You can re-glue it back with a little crazy glue, BUT it must be perfectly centered, and without getting any glue on it. So, if you don’t see the plastic lens, but instead see the laser pick-up assembly, look around for the lens inside the unit and glue it back on.
To clean the lens you must use very little pressure. Take a cotton swab and barely moisten it with plain, non-scented, or oily type alcohol. In a swirling motion, very gently rub the lens until you’ve covered it entirely. Then repeat using the dry end.
If the cleaning didn’t help, don’t despair just yet. You can see if there’s a problem elsewhere in the unit by using a few simple tricks and tips.
First thing you want to see if the unit’s laser is in good working order. This method isn’t foolproof, but most of the time works admirably. When you insert a disc, see if you can look up underneath where the disc sits on the turntable. Observe the laser lens going up and down. If the lens is trying to focus, that’s good! After a few seconds of the lens trying to focus, the platter should start to spin. On almost every CD/DVD unit I've encountered, the unit won't spin unless the laser has properly focused on the surface of the disc. If the unit spins up and and then shuts down, you should check and make sure the laser pick-up assembly slider mechanism is working without any obstructions and that the small chrome rail that it slides on is slightly greased. Don’t go overboard with the grease though, as too much can cause all sorts of problems.
The slider mechanism, depending on the age of the unit and the manufacturer, consists of the small chrome rail, a drive motor, a small gear assembly, and (in some units) a small belt that drives the slider unit via the motor. This small belt causes all sorts of problems. If the belt is broken or slipping, it can cause skipping, dropouts, or simply no start up at all. Also, if the belt breaks in the middle of the disc, the drive mechanism gets hair or dirt wrapped up into the gears, or the pick-up assembly doesn’t return to the start position (called home), the unit will (99% of the time) refuse to release the disc, causing it to become stuck inside the unit. There’s a little micro or leaf type switch located at home position that sometimes gets dirty or breaks and, causing this problem also.
If the disc starts to spin slowly and doesn’t come up to speed, the spindle motor that’s attached to the turntable platter is a common problem. There could also be a problem with the spindle motor driver controller IC or the power supply regulator that supplies voltage to the driver IC. If the disc starts to spin and then spins really fast, or stops and starts to spin backwards, your problem is the laser pick-up assembly or the servo control circuit. If you continue to have problems after cleaning and checking the other things listed above, you may have a problem with the player's alignment. Of course, one of the problems you'll face checking alignments on a DVD/CD player is that you’re going to need to use an oscilloscope on most of them. If you have the proper tools and equipment, the first thing to look at is the RF pattern of the unit while its playing. It should be a sharp and clear pattern. If it's dull and smeared, then the laser could be weak.
Also, in these units are very critical alignments called the focus/tracking gains and offsets. When these alignments are off, it can often cause intermittent troubles. As the unit ages and parts change value, so do these alignments, and will need to be checked. In my time as service technician repairing DVD/CD players, 65% of the laser pick-up assembles I have tested were good and only needed a small adjustment. Today's technology makes it unfeasible for a shop to hook up a DVD/CD player, and even some recorders, to their equipment and make these adjustments because of the cost involved.
Hope this may help;
DON'T TO FORGET TO RATE
Posted on Aug 25, 2008
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