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EMERSON TV MODEL EWT2721

I HAVE NO POWER AT ALL, NO STAND BY VOLTAGES, NO VOLTAGES ON TRANSFORMER T601 ON THE SECONDARY, ONLY ON THE PRIMARY I HAVE 169V

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Unplug your tv and check the volts in primary capacitor .if it will not discharge the regulator IC is bad .



Posted on Oct 11, 2008

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Conventional power pack


A primary and secondary usually refers to a transformer. The primary side being the input side 110 AC Volt or 220 Volt AC side. Also called Source.
The Secondary being the "output to load" side 12 Volts "for example". And also called Tap (Secondary Tap)

The voltage is changed by conduction, magnetic flux, neither side touching one another. And the number of turns of wire, per side, determine the voltage. The voltage may either be a step-down or Step-up depending on its use.
An unconventional method is to have both the primary & secondary combined into a single tapped winding - which arrangement is called an autotransformer. The autotransformer does not provide isolation between primary and secondary circuits but its simplicity makes it economical and space-saving.
Imagine a single wire wrapped from the top to the bottom being the primary, and tapping in. in the middle and bottom for the secondary, so the output becomes 1/2. That would be a step-down transformer.

The actual measurement of a transformer is measured by its efficiency (Faraday Law) which is defined as a ratio of power. I hope that's sufficient, but if you want more I would buy for $2 bucks an Electricity Made Simple Book, because there are pages after pages to write about transformers, and to understand electricity in general it is helpful to understand the difference between alternating current and direct current and its magnetic field of induction and magnitude of emf.

May 10, 2014 | Cars & Trucks

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How to measure Voltage in Transforme for Fitness Treadmill


Transformer Test Procedure:1). Make sure that transformer wire connections (CON1) to the drive board are secured. Turn unit on.2). Put multimeter to the AC voltage setting. Insert meter probes into the transformer primary (red)wires as shown. Normal reading: 110V. This shows that there is power to the transformer.3). Test transformer output by probing on secondary (output) wires: black and black, white and white,orange and orange, yellow and yellow

Transformer Test Results :1). If there is no voltage across the primary (red) wires, inspect F1 fuse on the drive board and power to the drive board. 2). If there is voltage across primary wires but none across secondary wires, the transformer is bad.Replace it.

Transformer Wire Colors Normal Voltage Value:
Red and Red 110 VAC.
Black and Black 11-13 VAC
White and White 11-13 VAC
Orange and Orange 27-29 VAC
Yellow and Yellow 10-12 VAC
_0.png

on Oct 26, 2011 | Exercise & Fitness

Tip

How to measure Voltage in Transformer for Fitness Treadmill


Transformer Test Procedure 1). Make sure that transformer wire connections (CON1) to the drive board are secured. Turn unit on.2). Put multimeter to the AC voltage setting. Insert meter probes into the transformer primary (red)wires as shown. Normal reading: 110V. This shows that there is power to the transformer.3). Test transformer output by probing on secondary (output) wires: black and black, white and white,orange and orange, yellow and yellow.

Transformer Test Results:1). If there is no voltage across the primary (red) wires, inspect F1 fuse on the drive board and powerto the drive board.2). If there is voltage across primary wires but none across secondary wires, the transformer is bad.Replace it.


Transformer Wire Colors Normal Voltage
ValueRed and Red 110 VAC
Black and Black 11-13 VAC
White and White 11-13 VAC
Orange and Orange 27-29 VAC
Yellow and Yellow 10-12 VAC
.png
ERNESTO CUADRA

MANAGUA, NICARAGUA. C.A.

on Oct 26, 2011 | Exercise & Fitness

1 Answer

Schematic malibu 8100-9120-01


http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

I don't think they post schematic for the transformer
But generally, the primary coil receives 120Volt AC input from household electrical outlet
And the secondary coil produces 12Volt AC output for the low voltage lights.
The 'coil' is a coil of insulated wire wrapped around a metal core. Two coils set side by side create a transformer... when primary is energized, the secondary responds to the magnetic field caused by primary core... resulting in a current that flows on the secondary coil.
Output voltage on secondary coil is determined by the number of wraps and diameter of wire.

Some transformers offer a choice of secondary output... Kichler for example... you can select 12-13-14-15 Volt AC output
This is achieved by the way the secondary coil is wrapped.... for less voltage a wire is tapped at one point on the coil... for more voltage, a wire is tapped at another point on coil. This gives the user several wire choices to connect the lights.

Gene

May 09, 2014 | Intermatic Malibu 300W Power Pack...

1 Answer

How to test for bad transformer


  1. To test a transformer you need to know what type of transformer it is first. There is a step up transformer which steps the voltage up and a step down transformer which steps the voltage down.
  2. You will still test the transformers the same way for step up and step down transformers. If it is a step up transformer apply the incoming power to the transformer or plug it up. Now take your multimeter and place it on the AC volt scale and test the voltage if the voltage on the data plate says the transformer should step up to 220 volts and it doesn't then your transformer is bad.
  3. Now repeat the same steps for a step down transformer. Plug up the incoming or primary power and test voltage on the outcoming or secondary side the voltage should step down to the proper value. If you don't read any voltage on the secondary or outgoing side then the transformer is bad.
  4. To read the voltage place the two meter leads on the secondary side, or the side you will plug your equipment into. If the secondary side is an outlet then place the two meter leads into the top two slots in the plug and read voltage. You also want to make sure the incoming power is working as well. Otherwise you will be reading a bad reading every time.

Dec 16, 2011 | Emerson LC320EM8 32 in. LCD TV

1 Answer

1 phase , 50 Hz, 20 KVA , 2200/220 v , is connected as an auto transformer of step up type . Determine , a. The auto-transformer transformation ratio . b. Auto-transformer primary and secondary currents...


This is NOT a forum for college problem solutions. How would you have a 20 KVA transformer and an Atlas Sound AF140... these are different animals... Autotransformer is a more efficient connection when it is possible... the transformer will step the 220 up to 2200+220 volts ignoring the copper loss voltage. For proper designed transformers the primary and secondary copper losses should be close to equal... but in autotransformer connection the efficiency is improved as the added voltage of the supply going to the high voltage winding power does NOT suffer and add to the current required in the primary of this connection. The purpose of this problem is for you to discover that the efficiency of autoformer connection is higher than of a simple step up connection. Now with this carefully work the problem... The ratio I have all but given you... It is unclear what is considered full load here so I would base it on regular connection at 20 KVA at 2200 volts to calculate what the currents would be primary and secondary.in normal connection... calculate resistance of primary and secondary ASSUMING equal losses primary and secondary. What isn't clear is if the loss figures are for the autoformer connection OR just the specs for normal connection. The power factor kink adds to the misery. Approach this problem by making an equivalent circuit of the transformer showing the primary and secondary resistances... again the question is are the loss figures the specs of the transformer or the actual running values for the system....

Sep 11, 2011 | Atlas Sound AF140 140 Watt Autotransformer

1 Answer

My TV is approx. 10 years old. Remote is broken. None of the codes work on the universal remote. I can't get to the external input mode to use my DVR. Help My TV is an Emerson 27" Model...


It may be a bad sensor on the T.V. and not the remote. However, if you really believe that the remote is broken,
http://www.emtcompany.com/emerson-ewt2721-remote/rc64.html
This is a link to get it.
If the channel buttons wont get you to the selected input, you probably have to play in the T.V. menu to see if you can get to the input from there, or just buy the replacement remote.

Jun 19, 2011 | Emerson Televison & Video

1 Answer

Will not power up----stand-by light blinks 6 times then pause..then 6 times,,and so on Its a Sony WEGA 32"


Hello

Six blinks of standby light in sony sets denotes the Horizontal Oscillation and output stop. It may be due to an Ic fault, or faut of some capcitors, or horizontal output trnsformer [LOT] or related component failure.
You must have a digital multimeter which can count frequency and have a concept of soldering. Just chek first for the secondary regulated main voltage [135VDC], ath the secondary side of SMPS. If it is ok, go to the line driver transformer, a small transformer fitted on the main board, very near to the LOT. Check its primary winding side for open circuted or not. If not check the voltage at the primary winding of that thransofrmer. Its one end is connected to the horizontal driver transistor. Measure the frequency at this point if there is voltage. It should come around 15.5KHz. If not suspect the horizontal video jungle Ic. To confirm whether this IC is faulty you must have the ability to follow the schematic diagram of the Tv, and some skill and experience in service.
If you have confidence inform me through Fixya. I'm ready to assist you. OK.

Jan 02, 2011 | Sony FD Trinitron WEGA KV-36XBR800 36" TV

1 Answer

I'm not getting any low voltage at the t-stat.


Make sure that the transformer has power on the primary side then check the secondary side for low voltage. If you have power on the primary and none on the secondary then replace the transformer.

Sep 05, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

No control power


PRIMARY means INPUT(from supply side)
SECONDARY means output( to load side)

Sep 23, 2007 | Maytag M6D24E7A Air Conditioner

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