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Dead psu Dead power supply on 26" bush tv IDLC26tv05HD. no dc output from the unit yet the mains supply is going in The Main electrolytic is charhing to 300v +.

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Apply a new PSU, the question is is it worth it to you? A psu is rather expensive to replace I would not try repairing it if I were you.

Posted on Apr 22, 2009

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Posted on Jan 02, 2017

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1 Answer

Samsung tv powers off, is the problem the power supply or main board?


Hi,
Samsung Power Supplies are prone to failing electrolytic capacitors, you could consider buying one of the many Repair kits available, or go for the more expensive but less skill required power supply board swop,
Samsung Repair Kits : TV Repair Kits MBTV Electronics
Samsung PSU's :
http://www.mbtvelectronics.co.uk/product-category/led-tv-parts/psu-boards

Dec 09, 2015 | Samsung UN40H5003 40 Inch 1080p 60Hz

1 Answer

What is psu?


Power supply unit computer
A power supply unit (PSU) converts main AC to low-voltage regulated DC power for the internal components of a computer. Modern personal computers universally use a switched mode power supply. Some power supplies have a manual selector for input voltage, while others automatically adapt to the supply voltage.

Apr 25, 2014 | HP Pavilion a1253w Notebook

1 Answer

Why does my Bush BLCD37 HDA8 keep turning itself off and the on again. It seems to only happen at home. I have sent it to a TV repair man who could not get the telly to replicate the problem, so he...


Check its main power supply regulator's output voltages. If main supply output from it is more than normal, this kind of fault can occur. [Over-voltage / Under-voltage] problem. The main system control IC in the TV will detect this condition, and will shut the TV Off. The best practice is to replace all the electrolytic capacitors at the main power supply regulator board.

Aug 18, 2013 | Bush Televison & Video

1 Answer

Bush tv model idlcd32tv05hd no pwer going to tv


Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.

All these can be checked on the power supply board.

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Regards.

Nov 27, 2011 | Bush Televison & Video

1 Answer

Dead


Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Good luck.

Mar 03, 2011 | Memorex MLTD2622 26 in. LCD TV

1 Answer

When I push power, the blue power light comes on but the screen never does. I had success yesterday by unplugging the main power, plugging it back in and then it would turn on. That trick is not working...


tim578, Unit's main power supply needs inspection and repair. Check for videos that deal with DIY repair of your FLM-3734b on youtube. May need to replace BAD (failed) electrolytic filter capacitors, and other components on unit's multiple dc voltage output "switch-mode-power-supply" board. You're going to need a lot of luck getting this one fixed!! You will need to do a lot of surfing to understand the polaroid problem!!
12fixlouie

Feb 16, 2010 | Polaroid FLM-3734B 37 in. LCD HDTV

2 Answers

No power


Is the fuse located before or after the main power switch?

If the answer is before the main switch, then maybe you should also check the main power switch (dirty contacts - these may cause insufficent voltages from the power supply).

Note that the (electrolytic) capacitors can be faulty but will not have visible damage, so check the DC voltages on the power supply output and try to replace the associated capacitors if the voltages seem to be too low (usually, there will be 12 and 5 volts outputs, sometimes a 3 volt output on some brands/models).

If it turns out that these voltages are not present at all, then there may be damage to the transformer driver IC (i'm assuming this is a switching power suply) - see if there is any AC voltage present at the secondary terminals of the transformer, if there is none, then the primary is most likely not being driven by the 110 V and this points to the driver IC as the possible cause. It may also be some other component in the primary section, but you said you've checked them out, so i don't know what else to suggest.

Hope you can fix it.

regards

Triarcuate

Sep 29, 2009 | RCA DRC220N DVD Player

2 Answers

Orange Led syndrom


I found the following solution on internet:
VIEWPIA LCD
Make: Viewpia
Model: LC-32IEB2
Fault: Unit held down with only orange LED lit
Remedy: Remove the main metal screen cover from main board and check the input
voltage on to the main 3.3Volt regulator IC202 it should be bang on more or less
5Volts, if not replace capacitors C905 330uf 10v C908 470uf 10v both are to be
found in the main power supply section.
J Williams
www.jvsvisual.com

Unfortunately I'm not very technical so now I will need to find someone to do this for me...

Dec 22, 2008 | Televison & Video

4 Answers

Packard bell imedia 1308 power supply unit


Do you have the correct/original power supply, and it is having problems of some sort? If so, you might be able to do some repairs. A common problem is often one or more of the electrolytic capacitors is bad. Take the cover off, and look for bulged capacitors (top of the capacitor pushed up & out). If you find one or more of these, replacement may return the p/s to working order.

Please note in ATX power supplies, you have a standby and full power or main section. The standby portion powers just a small section of the motherboard to sense when the power button is pushed, and activate the main full power section. Obviously, the main section powers the full motherboard, drives, fans, etc.

I've seen several units where the standby section has one or more bad capacitors which will produce either a dead or slow to turn on computer.

Use a voltmeter and monitor the voltages. There are sites on the 'net with pinouts http://pinouts.ru/

Check here for further instructions http://www.fonerbooks.com/power.htm

As regards replacement capacitors: I use mostly the Panasonic FC series available from Digi-Key Electronics. Mouser Electronics also has suitable units. You want capacitors designed for switching power supplies.

Hope this helps you out.

Nov 18, 2007 | Work Station 250W ATX POWER SUPPLY (=...

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