Question about Mintek MDP-1810 Portable DVD Player
DVD seems to spin correctly, but screen may read "no disc" or may play for a bit then freeze, or not play it at all.
I posted this some time ago but I think it can help you, so here it goes:
You can try a cleaning disk, however it has been my experience that the cleaning disk will not help, but it is a good place to start from. More then likely it is a problem with the laser pickup photo-transistor, these often malfunction causing this problem. I would suggest if you are going to try to repair this yourself, you will need a multimeter, a laser meter, and a schematic. The first step is to measure the laser energy leaving the laser diode and see if it matches the specifications in the schematic, if it does not, check the bias voltage with the multimeter, this is to determine if the problem is the bias voltage or the diode itself. If the diode is bad replace it. if the diode is good then the pickup becomes suspect. Using the multimeter measure the bias voltage on the photo-transistor with and without the presence of the laser light from the diode. This will tell you if the photo-transistor is good or bad, if the transistor is bad replace it , if it is good check the components that make up the biasing circuitry.
Now This test will produce a test of go or no-go on the laser diode and the photo-transistor. One of these components or their related biasing circuitry is either bad or about to go bad, by testing the voltages and laser light levels you should be able to determine which one or if both have a problem.
I hope this helps,
Posted on Oct 08, 2008
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Posted on Jan 02, 2017
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