Question about Portable Televisions

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No 24volt power supply


no power

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  • meeme1 Jan 04, 2009

    i had a power serge .unit no longer fuctions.

  • Angel Walker
    Angel Walker Feb 27, 2009

    TV worked fine, until one day, it was DEAD. Don't know what to do.



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  • 280 Answers

Bad cap or switching trasistor in secondary PS. Make sure connections on relay are ok

Posted on Mar 10, 2008

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Lost charger


if you are right and it has been discharged for this long it will take a long time for it to start to charge.it could also not charge ever again. batteries have to have a minimum off 1.5volts to be able to recharge. if it drop lower than this it cannot charge. now sometimes you can jump start the battery with a slightly higher voltage but only to the battery not in the unit. goes as follows. 1.5v battery jump 3 seconds on 3volt. 3v battery jump 6volt 3 sec, 9volt jump 12volt 2 seconds, 12volt 14-16volt 2 seconds 2 times. 14volt and 16volt is max 24volt 1 second at 3 intervals. all these are set at a 3amp no higher amp.

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Hello,

Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

I hope this will help to solve the problem...

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Power supply board have problems.Replaced the power supply board,will solved this problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

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Heading out the door to work, I accidentally grabbed the wrong power supply. My Coby CD-TV153, which requires a positive center, 13VDC power supply was plugged in to a NEGATIVE CENTER, 9vDC power supply...


its not always fatal depends on what is damaged internal
however it may be cost effective to just replace the unit
the power circuit in the tv needs to be checked and see what if any thing is damaged it then you can make a asesment of repair

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1 Answer

No picture or sound on tv


This sounds like a power supply problem. Check for a blown fuse in the unit. If there is no blown fuse then the power supply might have a shorted or open component in it. Check for the blown fuse first if the fuse is not blown or it can not be fixed by changing the fuse then the next culprit is the power supply, you will have to have a qualified TV technician do this.

I hope this helps
Thank you
shuttle83

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1 Answer

Tv Is not respondind


This denotes a problem with the power supply either the low voltage power supply of the high voltage power supply. You will need the following documents and equipment if you plan on doing this yourself: 1) a schematic diagram 2) a Multimeter 3) an oscilloscope 4) a signal generator (color bar, cross hatch, and purity) The schematic will let you know where the test points are and the level of voltage and signal are supposed o be at the test point. The multimeter will allow you to trace and measure DC and AC voltages throughout the set. The oscilloscope will allow you to view the waveforms generated by the signal generator, this is needed to tell if a component is not processing the signal in the proper fashion. The signal generator creates a standard reference to measure by. Since this prolem is in the power supply section you should determine if the problem is a blown fuse by visually inspecting the fuse. Than you will need to determine if the problem is in the high voltage power supply. You do this by checking the transistors in the horizontal section of the TV. you will find the problem either in the low or high voltage power supplies.

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1 Answer

Konka model 1508U 12 v dc ADAPRTER PORT


Most devices are Negative to Earth, Chassis and Positive to the Center Pin on the "Adapter". So probably any 12 - 14 Volt say 4Amp well regulated, or Switch Mode power Supply probably would power your unit.. If you don't know the exact voltage Start at about 6 Volts and work up until it works correctly.. I often use a switchable power Supply to find the right voltage and then get a fixed supply to suit.

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1 Answer

The Televion will not turn on


This sounds like a possible power supply issue. I would suggest that you get a schematic, open up the set and look at the power supply section using a multimeter to measure the voltages.from the begining of the power supply plug, to the end of the power supply voltage regulator. I you want to we can troubleshoot this issue togeether, via live chat. Thank you, Shuttle83

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