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Rca D52130


Power supply or high voltage supply problem---set well known for bad solder connections in and around the high voltage transformer---also known in early models for the high voltage splitter to be bad.

typical high voltage transformer:


11_5_2012_5_56_57_pm.jpg

Nov 05, 2012 | RCA Televison & Video

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

Screen does not switch on at all , and no sound either. However standby light is on only when plugged. TV repair told me it is transformer and line up, however asking for more then 100...


Hello, most common faults, such as CRT TV will not turn on. The reason stems from the low power supply failure, or from the high power supply. There are two transformers suppliers, with more common high-tension transformer goes bad. Price of 80 or $ 100, sounds reasonable replacement of transformer. Along with this need to perform some tests that require a professional, to confirm that the problem is due because of transformer. One test is to test basic stability, voltage power reaching the high-voltage transformer. If lower than normal voltage. Then perform the same test, when you break the initial snap of the transformer. If the voltage rises to the desired level must be to replace the high voltage transformer. Good luck!

May 12, 2011 | Sanyo Televison & Video

2 Answers

M-Audio BX5 - No Power


Don't bin! This should be a simple fault to rectify.

Fault finding technique as follows:
Trace mains voltage up to main transformer - there could be a standby transformer with relay in parallel. Check mains voltage all the way until it stops. If you have voltage up to main transformer, check that you have low voltage at the other end - if not main transformer at fault. If you don't have, then check to see if you do have a standby transformer - much smaller and usually on small circuit board near where power comes in to speakers. They are notorious for blowing on many audio systems as they are constantly connected to mains unlike most of the other components - power spikes kill them in particular.

Jul 29, 2009 | M-Audio Studiophile BX5 Main / Stereo...

2 Answers

Plug it in and there is no power


Power supply will need to be changed

Jul 09, 2009 | Office Equipment & Supplies

1 Answer

I have a crate BX 160 that shuts down at the point where it starts limiting and then after a about 30 seconds. it starts back up. I would like to get a schematic on this particular piece of equipment...


I just saw your post. I happen to have a Crate BX-160 and was able to call Crate in St. Louis and talked with a tech there at the plant and he actually sent me full schematics for free.

Your problem, based on my electrical background and fixing audio equipment for 10 years, seems to be related to the built-in limiter in the power transformer. In other words, you might just need a new power transformer and it is a piece of cake to install (all push-on connections).

The schematic will show you the many test points for voltage checks, but unless you know what you are looking for, its just information overload. It is a rather simple amplifier and built resonably well. I have been using mine since 2003 and have fixed it a few times (age related problems like loose connections). There just is not much to go wrong on them except for the fact the amp is subjected to extream vibration. THis causes physical connections to fail resulting in vexing issues that are hard to solve. This is not unique to this amp (all bass amps).

I would bet anything your problem is the power supply shut-down circuitry is malfunctioning. In my expereience with amps, unless the amp is drawing current (failing power circuitry) and making strange sounds, the failure is usually not related to the power section failing (like power transformers going out). Likely, the built in limiter is the problem.

I hope this helps!

-mike
(development engineer)

Jan 20, 2009 | Audio Players & Recorders

2 Answers

NEW 600W L.V.TRANSFORMER DOES NOT PRODUCE ENOUGH POWER


This is more than likely what has happened . I am going to guess that your original low voltage trasformer was a 120 volt .6KW. Or 600watt transformer that has one lead from it to the lights . The newer less expensive transformer is also 600 watts , but the new one may have 2 sets of wire terminals on the back( 4 screws ). If this is the case , you have a transformer that is 600 watts output but it has 2 seperate 300 watt outputs that won't run 600 watts from 1 set of output screws . You will have to seperate the lighting load and may have to run an additional low voltage wire to half of your lights . In other words . Put 300 watts of light on 1 set of 12volt output screws and 300 watts on the other se of output screws .that will solve your issue . Good luck and enjoy your lights again . John

Nov 03, 2008 | Garden

1 Answer

SONY VAIO IS NOT CHARGING BATTERY


I hate to ask this, but I have to..... Is there power at the wall outlet? Okay, now that the stupid question is out of the way (you'd be surprised how many service visits I've made for this)

make sure the AC cord between the wall and the transformer is in good shape and securely connected to the transformer. If you have a voltmeter, measure the voltage at the transformer end of the AC cable and make sure you have AC voltage there

If there is a light on your power adapter transformer, see it it is on.

If there is a light, and it's not on, but you have voltage at the AC cable, then the transformer is not working and must be replaced.

If there is no light or the light is on, check the DC voltage at the power connector that plugs into the laptop. The correct voltage should be written on the transformer casing.

If you have voltage there, then your battery may be faulty. Otherwise there is a problem with the circuit between the adapter inlet on the laptop and the battery.

Sep 05, 2008 | Sony Computers & Internet

2 Answers

My tecnics Amplifier Model # su-v98 has no power. I've checked all cords


Try these test, the only common possibilty would be the transformer and the power supply if both channels are out.You better to check both the positive and negative voltages from the power supply to see if both are present or if one or both are missing.This would be dc voltages of approx.20 to 40 volts.The positive voltage must be equal to the negative voltage,with the exception of their polarity.If one higher than the other, the regulator in power supply is busted already.The transformer can be checked for AC voltage before the power supply.This reciever uses a single power supply so the problem would be,common to both channels.You better change the regulator and checked some capacitor near the regulator.

Jun 14, 2008 | Technics Audio Players & Recorders

2 Answers

Power surge damage, 120 volt 60 hz actual Model mvd1402


do this: donate it to your blind and deaf neighbor. you will feel better. your neighbor will never know.

May 29, 2007 | Memorex MVT2135 13 in. TV/VCR Combo

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