Question about Thomson 29DM400 29" TV

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INTERMITTENT SUPPLY hi, I would like to ask for some assistance with regards to the model PS31108 by thompson. The filter capacitor 680/200v from the power supply blown off and when I was able to restore it, there is ** sound output anymore. Please help. Cordially, Chris de Leon Philippines

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Hi there, a defective filter capacitor means a more defective parts near that part, do some test and check up with the rectifiers, resistors, and regulators. just consentrate on power supply section. ty

Posted on Mar 10, 2008

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2 Answers

NO POWER AT ALL


Hi
our tv set need to be serviced. Here are some tips:
1. Open main fuse. The fuse is clean but interrupted. You can try replacing it with one o the same value.
2. Fuse Blown or blackened. Short in the rectifier bridge or in the switching transistor. Out of the power supply: supply line rectifier (100/150V) shorted.

Sully

Sep 29, 2013 | Televison & Video

2 Answers

No picture on magnavox 20MF231W TV


Hi there

You should try to replace the electrolytic capacitors found at the back of your TV near the power supply. I replaced 2 of them in my TV but it still didn't work, then after about 15 or so later, i got it to work.

This is what they look like:
c748b69.jpg

To replace the electrolytic capacitors, you will need to remove the housing from your television.

Thank you for using FixYa. Have a nice day and please remember to rate this solution as FixYa!

If you need more help on this, just ask me.

Kind regards
Dustin Ellse(BearWeb)

Jul 03, 2008 | Philips Magnavox 27MS343S 27" TV

2 Answers

RCA tv turns off by itself and there is no picture


Hi
I repaired a tv set which has the same symptom. The problem was overvoltage as a filter capacitor in the line supply dried up and the voltage got out of control. I replaced both line supply filter capacitor and the RGB supply filter capacitor (47uF/250V) and the fault was fixed.
I hope this hint helps you.

Sully

Sep 25, 2013 | RCA TruFlat 27F520T 27" TV

1 Answer

Blinking LED light flashing. It is normaly steady orange until set is turned on then it is a steady green. I have unplugged the set to see if it will reset itself. Did not work.


Hi Donna Jared,

First of all, thank you for posting your question here at Fixya.com

The symptoms you've mentioned >>> blinking of the LED in orange <<< means that the power supply board of your unit gone to out-of-regulation condition and sensed by the feedback circuitry.
It will not power up unless the faulty parts are isolated. Most of this symptoms is caused by faulty(leaky/dried) filter electrolytic capacitor on the power supply. Leaky capacitor has a physical indication of fault like bulged/dome at the top and can be easily identify through visual inspection. See sample picture of leaky capacitor with dome at the top.


12_11_2011_1_05_20_am.jpg

If your unit is not under warranty period(if so, avail it because the manufacturer will fix it for free), open the rear cover and inspect the power supply section(this is where the power cord's directly connected). If you found them on the board, replaced it with same capacitance and working voltage that is printed on its body itself. For more info, watch the video below.



Dried electrolytic capacitor has no physical indication of fault. Not all capacitor that are look physically fine are in good condition, only the capacitor checker/tester can reveal its condition. If you are going to DIY, you must have necessary tools and test instrument and know safety precaution working on the power supply board because there's some component that store electricity that can caused injury(electric shock) even the unit is unplug from the outlet.
Also, check for bad solder joints(cracked/dried/cold solder) on the board, it can caused the same symptoms and very common on the set after 3 years because of heat build up on the parts while on operation. It is hard to spot, I would advice you to used magnifying glass and work on the brightest area or used table/portable lamp to find them on the board. Re-solder the suspected joints as much as possible.


If you can't troubleshoot the unit yourself, I would advice you to ask for an estimate first to your local repair shop to have an idea how much money you are going to spend sending the unit in to decide if it it is worth to repair or not.

Please let me know if you need further assistance.

Goodluck and take care!

Kind Regards,

Jdvillanueva

Dec 10, 2011 | Jensen Televison & Video

1 Answer

Model 27LCDB03B-simply appears to be "dead" won't power up-not the fuse


Hello Chris, Hi, your TV's power supply section is not functioning properly. If the fuse is in good shape, then the auxiliary power section of the power supply is not functioning, this section powers the switching oscillator and IC that sends the pulse to the switching element like power transistors to create a main secondary voltage. the main secondary voltage is the circuit that produces all voltage needed source by the TV. what you can do if you are up to it.
A. Visualize any bulging capacitors, replace them. B. Measure the voltage across the following section in particular order so we can find the faulty parts.
  1. the AC input on the Power supply board. (none means open switch or power cable)
  2. the AC after the line filter circuit. (none means open line filter)
  3. the DC on the filter capacitor. (none means problem on the rectifier)
  4. then the AC on the switching element or input on the main transformer. (most likely you won't have any voltage reading hear.)if you do have continue.... (none means you scratch your head, this is the hardest part) check all low value resistors, high wattage resistors open or shorted diodes.
  5. the dc on the secondary filter capacitors.
If not have this checked by a technician, its to complicated for you.

Mar 12, 2011 | Thomson Televison & Video

1 Answer

Tv switches on for about 3 seconds ,then switches off


Hi,
The capacitor(s) of TV power supply spoiled and need replacement. Please check it out and get replaced. The purpose of capacitor is to stabilized power supply.
Regards, vote please, Jay

Jan 20, 2011 | Sharp 25J-M100 TV

1 Answer

Taking long time to start.??? Is it capacitor of power supply pronblem?


Hi,
Yes it could be the capacitors. Commonly the damaged capacitors can check it visually. It will dented or deformed. But please check also other parts on your power supply circuit like inductors, resistor etc. Use the volt / ohm meter to take measurement and checking.
Regards

Jan 16, 2011 | Sony FD Trinitron WEGA KV-32FS120 32" TV

2 Answers

I have a 6 year old 32" Toshiba tube .tv. I have


thir is somecondensers on the tv needs to be changed especialy on pwer supply and vertical circuit it is easy fault but needs technication,,,but first be sure thir is no floresent lamp common with the same supply of the set






Dec 23, 2010 | Toshiba 32A14 TV

4 Answers

My tv dose not turn on


Try unplugging it from the wall, wait 1 minute, then replug.
I presume you have tried both the remote and the button on the front of the set.

Dec 11, 2007 | RCA F27242GY 27" TV

2 Answers

36" tube tv. picture fuzzy and out of focus


It sounds like you may have a G1 intermittent short in the picture tube, which unless it is still in warranty would not be worth repairing.

Jan 02, 2007 | Philips 36PW9525C 36" TV

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