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No power to circuit board - Amana PTH123B35AJ Air Conditioner

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  • thekrum56 Apr 01, 2011

    Is it high or low voltage

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Posted on Apr 05, 2011

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1 Answer

Is there a feedback circuit that is shutting down the high voltage power supply?


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

May 11, 2016 | Samsung LN46C630 TV

1 Answer

Which television circuit board do I need?


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Mar 15, 2016 | Sanyo DP58D34 58 Class LED

1 Answer

On my z71 1996 model rear bake lights don't work but the third light works, could it be the brake switch ?


No, it is not the brake lamp switch. If the brake lamp switch was not working, the high mount (3rd) brake lamp would also not function.
Chevrolet trucks are notorious for bad tail lamp circuit boards.

Disconnect the electrical connector from the circuit boards. Check for power at the circuit board connector (with the brake pedal depressed) on each side. The brake/turn lamp circuit for the left side is the YELLOW wire. The brake/turn lamp circuit for the right side is the GREEN wire. If there is power at the connector, check the GROUND (BLACK wires) to make sure they are getting a good ground. If the power and ground circuits are OK at the connector, replace the circuit boards.

NOTE: DORMAN makes a kit that includes circuit boards for both sides it is DORMAN Part Number 70001

If there is no power on the YELLOW and GREEN wires at the circuit board connectors, the most likely cause would be a defective turn signal switch.

Apr 28, 2012 | 1996 Chevrolet K1500

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

No power to motor. plug o.k.. power to plug o.k. all of a sudden just quit working.


Make sure you have power going into the circuit board on the cable terminals, you need to measure the voltage from the circuit board and the resistance on each armature segment as these can blow the circuit boards.
If the circuit board is faulty you must check the armature before replacing,

Jan 01, 2010 | Andis AG 2 Hair Trimmer

2 Answers

LG Washer wont start, no power


Make sure there's power getting to the washer. Check for a tripped circuit breaker or a blown fuse. Check the wall socket for power. Sometimes the power cord disconnects at the washer, if this is the case, the wiring must be repaired or replaced.

Jun 21, 2009 | LG WM-2277HW Front Load Washer

2 Answers

My fredge rm 2652 not working


Between 1993-1996 dometic used a yellow epoxy filled circuit board that went bad pretty quickly if you have the yellow filled circuit board rather than the green one it is most likely the circuit board

Jan 09, 2009 | Dometic RM2652 Refrigerator

1 Answer

Part number: 316809100002-R02


I too have the same power board burnt out ... did anyone ever find the part you was looking for ... Thanks

Nov 20, 2008 | Computers & Internet

3 Answers

Power Surge damage. Suggestions on which part to replace.


You probably have a sacrificial diode that blew out to save the rest of the monitor from further damage. The manufacturer should replace it with a refurbished one at little and sometimes no charge (comparatively speaking).

May 08, 2008 | Computers & Internet

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