Question about Shinco SDP-1750 Portable DVD Player

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Display light is dark

The display monitor can be turn on when the power on, but the screen becomes dark after that. The image can still be seen but not bright enough. The light adjustment is not working.

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  • allanxlz Sep 04, 2007

    Sorry, the model is Shinco SDP-6820.

  • allanxlz Sep 04, 2007

    May I have some detail on the solution? Is it a component failure or cable issue?

  • allanxlz Sep 04, 2007

    Without the schematic, it is hard to measure the voltage. I can not open the monitor cover even all screws are unscrewed. so the continuity of wires can not be measured. Very sad. Do you have any idea to continue the troubleshooting without schematic?

  • allanxlz Sep 05, 2007

    Thanks.for your time to explain so detail to me. Sorry I didn?t let you know I am an electronic engineer :). I fully understand what you said. I have opened the unit and desoldered a SMT switch (I suspended it was failed in the beginning). I have not opened the display panel as I felt the chance of cable failure was very low. I have Oscilloscope, multimeter and SMT soldering/desoldering station. If I have schematic, I will raise the different question to you, definitely not like this. Why I still throw this simply question to you?
    1. Sometimes a standard circuit will be used on the similar products, like LCD display. So even I don?t have the specified schematic for this product, I may still be able to do some troubleshooting for this small portion with the standard schematic, like stepper motor amplifier.
    2. When I bought this DVD player one year ago, it cost me double price compared to now. And the repair shop will charge me at least 25% of a new DVD player price excluding components fee (maybe 50% or above if including components charge). So it is not worth to send it to a qualified repair shop.
    3. And the more importance is this is my hobby. I love to repair things. This is main reason why I don?t want to send it to repair shop. If I really need it, I can buy a new one.
    Anyway, thanks again. I will donate it to school.



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I have seen this problem before this is caused by a failure of the backlight which provides illumination for the LCD screen. You may also want to check the inverter also since it fails often and interacts with the backlight.

Posted on Sep 04, 2007

  • Henry McKelvey
    Henry McKelvey Sep 04, 2007

    The flex cable might cause this. I would suggest that you take an ohmmeter and test the cable for open traces. This will take some time but it has to be done to eliminate it as a possibility. Now if the cable is good I would take voltage measurements to see if a component might be bad.

  • Henry McKelvey
    Henry McKelvey Sep 04, 2007

    Troubleshooting without a schematic is never a good idea. This is because you may miss something vital to your analysis. So the best bet would be to take the unit to a qualified repair shop to avoid any damages.

    Now we can look at this from a different point of view, we know what might be causing this issue the only problems are getting a schematic and opening up the unit. You could take the unit to a local vocational high school and donate it and take a tax write off. These suggestions go very little into repairing this unit because of what you will see once you open the device up. Let me tell you.

    You will see a switching power supply, an optical drive with a carriage, drive motor, and a laser control board, and finally the main DVD video/controller board. All of these will have surface mounted components which are very small and require a magnifying glass to look at them, along with specialized desoldering tools. This along with an Oscilloscope, laser power meter, and a multimeter. Now if you have all of this you will still need a schematic to know which test points to look at and where those test points are located.

    Are you begining to see the magnitude of this repair job, that is why in all of my post I try to get folks to see that working on these devices past the mechanical aspect, is not impossible, but you have to have the proper equipment for the job. Even as a certified technician, If I run into a main control board problem I troubleshoot it to component level and then once my technical curiosity is satisfied I contact the DVD player company and order the actual DVD controller module, and replace it, do the laser alignment and then charge the customer the cost of the module and labor.

    That is the raw truth about these device, they were designed around throw away technology, that is why one can cost 69-199 dollars at a pop.

    I know this is not what you want to hear and you may give me a bad rating, but I feel that by telling you the truth about these devices, you can make an informed choice of repairing this device or getting another one and donating the old one as a learning tool for future technicians or using it to educate yourself about the functions of the DVD player (once you get the schematic from the DVD player maker).

    I hope I have not offended you.

    Thank you.




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2. Your laptop turns on but the screen remains dark all the time. You still can see a very dim image outline. The laptop works fine with an external monitor.
3. The laptop screen works fine for hours or even days, but sometimes it goes very dark as it mentioned above. When you restart the laptop, the screen works fine again.

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  • The viewing angle of an LCD TV is typically not as great as Plasma but the difference is not great enough to make a huge difference.
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Plasma technology hasn’t been as widely used as LCD in previous years but has become very popular in large HDTV’s. Although they have historically been more expensive than LCD TV’s, they are becoming more comparable in price.
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