Question about Uniden PC68XL (40 Channels) 2-Way Radio

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Blows fuse when you plug power in, it is not

Has a dead short in it, trips my power supply, components look good visually

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Make sure you're connecting the radio with the proper polarity. There is a protection diode inside that will cause the power supply fuse to blow or go into overcurrent shutdown if you have + and - reversed. It's also possible this diode has been shorted. You can't tell by looking at electronic components (unless they are physically damaged) whether they are good. An ohmmeter can be used to test for shorted diodes. Look at the board where the power leads connect for the diode.

Posted on Mar 22, 2010

Testimonial: "thank you, bad diode replaced and now works fine"

  • Steve Tompkins
    Steve Tompkins Apr 01, 2011

    Mine did this by accident. I bypassed the diode by hooking a power lead to the "Final" chassis instead of replacing the diode. Now, mine is working fine. I don't know how it works but the little small chassis inside near the back is a Power source to the radio. I just simply Bypassed that diode. I get good results!!!!!!!!!

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Hello

Your TV is now in dead condition I should say. You should strart from its power supply regulation section itsef to rectify the fault. Look into the fuse, a glass fuse is there, in power supply board. If It has found blown, make sure that there is something short in either power supply regulator side, of on the other part of the printed circuit board.
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Usually Sony uses STR regulated type power supplies, and some uses MOSFET [Metal Oxide Semiconductor Field Effect Transistors], as switching elements. Bothe of these types can be shorted, due to a high voltage spikes, or a sudden supply failure and restart.
Check out short test on these components, out of board, that is, desolder it out from the circuit board. You just resolder one by one and measure the resistance ad described above. Thus you can find out the exact component, that have a short. If any of these components shorted, check the entire power regulator section for any more component failure, like zener diode short, resistors opened, and so on. You should have a concept of soldering and a little knoledge in electronics. There will be a MOV [Metal Oxide Varistor] fitted across the power supply input, which look like a disc capacitor. it will get shorted when a certain voltage spike occures abvve its rated voltage, and apply a dead short at the supply stage. If any of them used, desolder it out and check for any leak, and is found leaky, replace it. It is used as a saftey measure, and without it the set will work fine.
Just check these and if you find any difficulty, contact me through Fixya. Ok.

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1 Answer

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regards
shaun

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1 Answer

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Hello,

A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages or lightning storms. However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.

Note that it *may be* useful to replace a fuse the *first* time it blows (though it would be better to do some basic checks for shorted components first as there is a small chance that having a fuse blow the second time could result in additional damage which would further complicate the troubleshooting process). However, if the new one blows, there is a real problem meaning that your power Power supply board just die.It can be dead at anytimes.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Hope this work...



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1 Answer

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