Question about Nostalgia Electrics MTGA05 Shelf System

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No power in unit. Mains transformer burn out- Can this be replaced?

Transformer is marked with:-
SK-V481648CAF
(012103)

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How do I fix a burned out power supply board on a Philips FWD 185/94


Hi Qdiv,
If the power supply has burnt; it is better to replace it rather than repairing.
Good luck.

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Denon dra 25 no power


John,
If you have a multi meter then unpug from mains supply.With meter
on "ohms" range check the following:-
Fuse F501 (and F502 if mult-voltage model)
yellow to white on mains transformer this should show some resistance.If you have a mult-voltage model check
brown to gray and orange to white. Both should show some resistance, if not your mains transformer has an open circuit primary winding.....

Mar 03, 2014 | Audio Players & Recorders

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I have Onkyo HT510 receiver. does not turn "ON".


hi,
There is a standby transformer inside the Onkyo receiver at the mains input stage. If the standby transformer is faulty then the unit will not power on. There will be two transformers. One is big and the other is a small one. The small tarnsformer is the standby transformer. Which will be fitted on a small board where the power cable is connected. Replace the transformer to rectify this problem.
OK

Oct 15, 2011 | Onkyo HT510 Receiver

1 Answer

Philco american stereo system


Well since we in the UK use 240 volts and over the sea they use 120 volts, it should be no surprise why it no longer works. What the effect is couldn't be any clearer. Since most units only use around 30 volts to work, a transformer is employed to knock the mains down. These have what is known as a primary winding, this takes the mains, however the coil of wire will be designed for the mains it is going to be connected with. If it is connected to one greater they tend to burnt out. Often transformers have fuses built. However they don't tend to be replacable. So you will almost for certain need a new transformer. If you are really lucky a fuse might have been employed in the power leads going to the transformer. As long as it wasn't rated a 250 volts it could have gone and transformer is OK. BUT I WOULDN'T BANK ON IT!
Now you have an option, you could replace the transformer with the same type (which you would need to do for safety reasons) or you can get a very experinced technical person, to replace the transformer with one that will meet safety standards and have a 250 volt primary, for the UK. You can even get them that have two mains, one 250 and one 120!
If you just go for the replacement then you will still need a mains adapter.
PS There might be other damage, such as the mains switch!

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1 Answer

My RCA RS2620 has a shorted D820 and a burned R886. Can anyone recomend replacements / know the value of R 886 or have a schematic of this unit?


hi rnollett,

I just plugged my cousins RCA RS2620 into 220volt mains and burned the transformer because its originally 110 volt rating from canada. If you could please test your units transformer output voltages of RED-BLACK-RED wires so I can tell the technician to rewind the transformer usable to 220volt mains, he is asking me those output voltages and I dont have a clue.
Regarding your D820 and R886 if you have'nt yet found suitable replacements, in return, I will check the values of those parts here and I will send it to you.
Many thanks in advance.

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2 Answers

Westinghouse SK 32H540S when i Turn on TV, get Westinghouse logo, picuture turn on for 2 sec then black screen.


The problem is cause by the transformer on LIPS inverter (Power supply + Inverter board). You could see an obvious burn on the 1 of these transformers ( There are total 3 black transformer on this board). The part number is 4302H. It is available online at http://www.lcdparts.net/TransformerDetail3D.aspx?ProductID=2775

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1 Answer

Burning smell came out of the Tom Tom 910. Now does not boot up on mains or car cigar lighter socket


The power supply or voltage transformer or possibly capacitor is burnt out. You will have to visually inspect the main control board for burn marks and swelled up capacitors. You can use an ohmmeter to test them as well.

Dec 04, 2009 | GPS

1 Answer

CARRIER AIR CONDITIONER/HEAT PUMP PROBLEM WOULD NOT RESPOND TO THERMOSTAT. UNIT IS AT LAKE HOUSE WHERE WE DO HAVE BAD STORMS. IN CHECKING, INSIDE PART OF UNIT HAD BURNED UP THE TRANSFORMER BUT NOT...


what I have always been told is if your 24 volt side burns out check the high volt side if the hi volt side burns out check the low volt side.

A quick way if the primary side is burningout due to a problem with the low volt side:
1 MArk all the thermostat wires at the indoor unit
2 Disconnect them at the indoor unit.
3 Check main line voltage before proceeding (A 208 volt is not considered 220V and 240v Is not considered 208V> In these circumstances the voltage may have changed with the power company replacing a transformer and now you need to change the main power input lines at your control transformer for the correct operating voltage). If okj then proceed:

4 If you have an amp meter attach it to one of the lines going to the transformer.
5 Apply main power and listen for hum, note if smell starts again and if so problem has to be in board or main incoming voltage too high or too low. Amp draw should be less than 3 amps.
6 If your to this point and still havent found any trouble in the above as of yet, Connect the wire marked "C" together. Then just touch the thermostat wires one at a time to the places where they go on the indoor unit and watch the amp meter. If you donmt see the meter jump the circut is probably ok but leave them disconnected until you touch all of them to the correct place or wire. Here is a possible problem I ahve seen a thermostat wireing problem if the wires are stripped too far and a "whisker" of the wire sticks out and allowes one of the other wires to cross short out. In this case just cut off the excess wire or bend it over out of the way asnd continue with the test. You can always cut it off later after the tests. If you see the meter jump up and stay up and /or blowes the fuse the wire that you used and it blew is where to consentrate.
7 No wiring problem found means that you could have a relay or contactor not pulling in properly.
and this will cause the amp draw to go way over the transformers power out put or VA rating.
8 Inspect the thermostat wiring for the "whisker" I mentioned above.
9 If you have done this to the end of the thermostat wires and your main incomming voltage is correctly wired in on the transformer andf your relays and contactors are pulling in evenly and not delaying excessively your problem should be fixed.

If this helps you please rate me as high as you can and thank you for using fixya.

Apr 24, 2009 | Heating & Cooling

1 Answer

Roland Jazz Chorus 120 no signs of life! Plug fuse & back of amp mains fse OK Mains transformer??


The transformer on these units contains an internal fuse that may have blown. With the unit unplugged, measure across the primary winding of the transformer. It should read low ohms. If you get infinity, the primary is open and will require replacement.

Dan

Nov 11, 2008 | Audio Players & Recorders

2 Answers

The unit has no power when pluged in it must have a blown fuse as i said before how do i replace it


Hi diamonddan11

I have posted to your original request for help the details of this. here is a sumary


  1. mains power fuse FU11 is located INSIDE the deck on the same circuit board and the mains on off switch.
  2. There is a thermal fuse that is not changeable inside the widnings of the transformer. This is can be repaired but generally it is considered that you replace the transformer
  3. on the printed circuit board attached to the secondary side of the transformer you will find 5-6 pico fuses, or circuit protectors. The are small black 2 pin devices that are marked on the board as IC901 to IC905
  4. the main power regulator board REGB ASSLY also has a circuit protector IC911.
  5. Thjere are several others in power supply areas marked as IC907, 908, 909, 910, 913, 914.
OK, thats a run down of the fuses in the unit. Non are considered to be user replaceable parts. If the deck has had the wrong mains voltage applied, it is likely that it has blown the primary fuse, FU11. If you do replace that fuse, and the unit still does not work, the transformer may be blown, or any one or combination of the Circuit protector type soldered in fuses may need to be replaced also. If you cannot follow what I have given you here, I suggest you take it to a Pioneer Authorised Service Center.

I am more than happy to answer any other questions you may have about it, just give me a hoy :) If you are still unsure, or have problems, then before you give a rating for this advice, please get back to me and we can try some more things.
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek

Jun 21, 2008 | Audio Players & Recorders

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