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Poloroid flat screen model 3700-no picture, no sound. turn on- blue light comes on but can't be turned off without unplugging the unit

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Hello there: Your problem is in the power supply of this unit. If you lay the unit down flat there is a plastic cover covering the System Module. Take this cover off, it might be easier to just remove the entire back, but really is unessecary. After removing the cover there is a metal module, take the cover off this module and, inside the main circuitry the power supply is usually located in the upper portion of the module. Look at the capacitors, just in case you don't know what caps look like, they look similar to small batteries standing horizontal on the board. Look at the tops of the caps and you will notice two of them are buldging at the top. The tops should be flat like all the others in the circuit. They are usually located near the supply plug going to the main board. The value of these are 1000uf at 10v, if you look at the markings on the capacitor. Replace them with 1000uf 16v, as these will last a lot longer. You can find them at any Fry's or Radio shack. Remember the caps are marked with polarity markings plus and minus. Be sure to reinstall them in the same direction as the marking on the board. Usually a bold marking on one side of a circle printed on the board underneath the part indicates this is the negiative side. Positive to Pos and Negative to Minus (+/-). This will restore power to main board to normal and also fix any sound issues you may of encountered while they were going bad.

Posted on Nov 19, 2009

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