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Tympanometer / audiometer will not power on despite new power supply

All connectors are firmly attached to circuit boards. With new power supply, no sign of any life at all. Reportedly when problem initially arose, "jiggling" power connector got it to function. Now, nothing helps. Power connector appears firmly attached to circuit board. Previous user said there may have been a spark noise before its demise, but no signs of shorting seen anywhere.

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Computer power supply does not work


Need to know how old a computer it is as over the years the power supplies' use different methods of starting.

On newer computers the power supply is connected to the mother board by a 20 or 22 pin connector. The power button on the computer is just a momentary switch to start the computer. Make sure the large connector is firmly seated in the mother board. If you are comfortable with doing that have someone else check it. You do not want to damage the connector or mother board. You need to have some sort of anti static device conntected to your body to avoid any static discharge that could damage the mother board.

Feb 09, 2014 | Antec TruePower Quattro 850-Watt Power...

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My 42 inch Sylvania hdtv turns off after I turn it on


Hi
All of the new HDTV sets these days use a switch mode power supply (SMPS) to delver the proper voltages to the associated circuits. If the set turns off on its own chances are its in the power supply area. Start by checking the connectors attached to the circuit board for physical signs damage on the circuit board. Possibly a blown fuse, open resistor etc.
Hope this helps
Bruce

Oct 24, 2013 | Sylvania Televison & Video

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No power my LCD TV monitor 900t


Well, that looks like you have what we call a dry joint on the power supply connector of your monitor. With experience , i have discovered this to be a normal problem. Get a compute technician to open up the monitor for you and then take a closer look at the circuit board where the power supply is connected. Check for any dry joints (this means that there is a component on the circuit board that is directly related to power supply, and it is not properly attached to the board (soldered). Notice all the dry joints and use a soldering gun to put them back together and try to power the monitor. Check also for bulged or leaking capacitors. Replace them with the same type

Feb 20, 2012 | Computers & Internet

1 Answer

No picture but does still have sound


Most often, this symptom is a result of a failing POWER SUPPLY, but a bad / overheating LCD CONTROLLER BOARD, or a faulty INVERTER BOARD can certainly cause very similar symptoms. Unfortunately, without a donor TV or a dedicated test rig, it can be very difficult to differentiate between these problems.

One way to test this is to remove the rear access panel on the TV and replace the power supply circuit board with a new one, since this is the most often the source of the trouble.

You can usually find a replacement power supply circuit board on Ebay by searching for your TV's model number. If you comment back here to this page with the TV's exact make and model number then I can help you find suitable replacement boards as well.


The repair / replacement procedure is not extremely difficult if you have some basic electrical safety knowledge and some basic electronics / mechanical repair skills.

You will need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside.

When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your power supply circuit board itself and confirm that it exactly matches the one provided in the Ebay listing.

Then unclip and remove the various electrical wire connectors leading to the power supply circuit board. Then remove the screws securing the circuit board to the TV frame and then remove the power supply circuit board. Be sure to avoid touching any large capacitors on the circuit board which can retain a nasty charge even after the unit is unplugged.

Then just screw in the new circuit board and connect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.


If you want to replace the LCD Controller board (otherwise known as a TCON board), or the INVERTER BOARD, the process is not much different except for the connectors which are usually the flat ribbon type.


Here is a link to another Expert's solution to a similar problem which includes links to his excellent and informative set of LCD TV / MONITOR TROUBLESHOOTING GUIDES:

http://www.fixya.com/support/t10008425-when_turn_tv_picture_flicks_off


These guides will give you some idea of the various problems with LCD monitors and the associated repair procedures.

If you choose to rate BUDMRTN's troubleshooting tips by clicking on the YES THIS WAS HELPFUL icon on his solution page at the above link, then I thank you very much for your time and consideration.


Please comment back here to this page if you have any details to add, have any questions, have difficulty with the links, or just require further general assistance and I will respond as soon as I see it.

I hope that was helpful to you, good luck.

Joe.

Aug 11, 2011 | Televison & Video

1 Answer

I have a sharp aquos 37 lcd and one day I turn it on and hear a pop sound and it went dead no power


Normally this is indicative of a faulty power supply circuit inside your TV.

The easiest way to test this is to remove the rear access panel on the TV and replace the power supply circuit board with a new one.

You can find a replacement circuit board on Ebay by searching for your TV's model number.

Here is a link to one currently available for about $100 plus shipping:


http://cgi.ebay.com/DPS-178APA-Power-Board-Power-Supply-Sharp-LC-37D43U-/260814504762?pt=LH_DefaultDomain_2&hash=item3cb9c1833a

Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information and items at the website indicated.

The repair / replacement procedure is not extremely difficult if you have some basic electrical safety knowledge and some basic electronics / mechanical repair skills.

You will need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside.

When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your power supply circuit board itself and confirm that it exactly matches the one provided in the Ebay listing.

Then unclip and remove the various electrical wire connectors leading to the power supply circuit board. Then remove the screws securing the circuit board to the TV frame and then remove the power supply circuit board. Be sure to avoid touching any large capacitors on the circuit board which can retain a nasty charge even after the unit is unplugged.

Then just screw in the new circuit board and connect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.

One other thing you can check is to see if there is a fuse fitted on your set.

Some models will have a fuse holder compartment accessible from the rear of the set right where the power cord enters the enclosure. If your set does not have one of these, then the fuse may be located directly on the power supply circuit board itself.

Try testing that fuse for continuity with a voltmeter (with the set unplugged of course). If that fuse has failed, then it will test OPEN. If you are lucky, you may then just need to buy an exact replacement fuse and then install / solder that into place to correct the problem

I hope that was helpful to you, good luck.

Joe.

Jul 17, 2011 | Sharp Aquos LC-37D43U 37 in. LCD HDTV

1 Answer

I have a DOD Mixer console, model 1642. It is giving me a 60 cycle hum. When I turn on the board all of the LED light max out. I have turned it on and off a couple of times to see if I can get it to...


I had this problem when I was attaching a "custom" power supply (an ATX power supply) to my DOD 1642 (circa 1992, revived in April 2012). I had a massive buzz and every LED was totally lit up. The problem ended up being a grounding issue.

If you're using the stock power supply, make sure the ground is attached firmly both at the three-prong connector at the wall as well as the 7-DIN connector on the back of the board. You may want to take an OHM meter and make sure the grounding pins are all in contact throughout the power supply: With everything unplugged from wall power and the board, test from either (or both) of the DIN pins to the ground prong of power plug (on the adapter NOT THE WALL). Then, test for connectivity between the two grounding pins.

If you're using a custom power supply like me, make sure you're grounding to a proper and valid ground. I ended up attaching my ground to three of the ATX grounding pins and the hum went away. My 20 year old mixer is alive and well now.

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1 Answer

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Double check all the connections from the AC line and from the power supply to the other circuit boards. The connectors you are mentioning are identical as per the picture below.
If you need a new power supply, you can find one from this link.


be4d37f.jpg

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