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Faulty Power board

Hi Ginko
Thanks for your response.
Is the faulty power board in the TV or the media box?
Thanks again
Sam

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I do not know what was your original post, please provide a link to original post so that I can know details about your case.
Thanks

Posted on Jul 09, 2008

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Philips 32pf9641d/10 fault works well for 90 mins then goes black still images on screen but no backlight ? power supply or inverters? if inverters can they be repaired or replacement only,


Hi.

As you said when there is no backlight the problem is either inverter or power board. In some case the main controller board may be responsible.
You need to test the parts to find out what part is responsible. Testing is done tracking voltage from PSU to inverter. Voltage to inverter is usually supplied by the higher VDC line from PSU. Here broad description of how to test the three parts: Before proceeding...
The TV can be repaired at component level or replacing boards, depending on your skills and experience. If you want to repair at component level, after diagnosing the faulty board you test components and circuits individually. In that case to test inverter in full you will need an oscilloscope to read the phase of inverter AC section (oscillators or IC must be tested).

Note: If Inverter has voltage out to CCF lamps, then the parts mentioned above are OK, in that case you have a faulty LCD panel. The TV is usually not worth repair as the LCD panel is expensive. LCD panel faults are not common.

Here replacement parts for most flat panel TV models:ShopJimmy.

See also:
PartStore

Regards.

Ginko.

Sep 20, 2011 | Televison & Video

5 Answers

Pioneer sd-p55a3-k 55 in rear projection


What you can do is get yourself a service manual from here:
http://servicemanuals.vstore.ca/

They also have spare parts and offer free online advice as you attempt a DIY. The issue is most likely a cold solder somewhere on the power board or some faulty capacitors. If you want to go in for a long term solution, you can easily replace the whole power board or just change the faulty capacitors. You will have to open the back panel and take a look. You can make out which are faulty, because their caps will be swollen on top. Here's a sample pic of a bust capacitor (not same model):
94fcd26.jpg
Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows this kinda stuff to do it for you, or get a qualified technician.
Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified technician to do it for you.

REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.

Hope that helps!

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1 Answer

Toshiba Regza 47wlt66 has sound but no picture


Hi.

If you have picture but no sound and problem is not cable settings or source selection, then the faulty part is usually the inverter.

Firs test the TV. Check if there is on screen display (the menu). If OSD is displayed, then the problem is either cable/source settings or a defective input circuit. Try also disconnecting power cord for ten minutes and then up to one hour. Power drain may fix temporary faults.

If all that does not work, then the problem is either inverter or power board. In some case the main controller board may also be responsible.

The inverter is a power board that converts DC voltage from PSU into AC high voltage, powering the whole backlight system. When there is a problem with the inverter the whole screen will be completely dark, while the sound keeps going on.
A problem with the inverter will mean that either inverter is bad, power supply is bad and does not power the inverter, or main board is bad and does not turn inverter on. Those are the three parts that must be tested when the inverter does not fire up ( sound and dark screen). Here broad description of how to test the three parts: Before proceeding...

From a user level point of view, all you should do is disconnecting power cord for fifteen minutes, and testing the TV with different connected devices and different cables (e.g. with a DVD, a receiver box, using a SCART and using HDMI).
Disconnecting power will allow a power reset that sometimes can fix temporary problems (usually not sound but no picture).
Testing different cables and devices excludes the chance of the problem being given by a bad connection.

If that does not work, call the manufacturer at the number listed in the owners manual. Verify warranty status (warranty may have expired 09/10). Make present to the operator that the TV is just out of warranty, and that the fault occurred without you making any wrong use of the TV. Some manufacturer in some case apply special condition.

Here replacement parts for most flat panel TV models:ShopJimmy.

See also:
PartStore

Regards.

Ginko.

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AEG OKO LAVAMAT 86820 Update .Its dead.How can i fix it, but first, open the door without being pluged ?


Hi.

First you need to do an emergency emptying by accessing the filter.

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Follow page 34 and 32 in this manual.

If you repute the solution helpful, then please do not forget to accept the solution.

Thanks.

Ginko.

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1 Answer

Vizio sv420xvt when turned on no blue screen,millions of red and yellow dots.Need to know what board to change and hope it is not the lcd panel


Hi.

You cannot know what board is involved without testing the TV. Testing requires skills and training.

The faulty board is likely the digital controller board(Vizio 3642-0492-0150), which is the main board inside the TV.

Before replacing the main board, the Power Supply and the must be tested.

On this 42'' there is also a Daughter Bd Assy, and T-Con Board that must also be tested.

Testing is done at component level, mainly reading volts in strategic points and checking components for continuity.

Here a general procedure explaining how to test the power board. Disregard the part on inverter as this is unlikely responsible for the symptoms you have described:How to test an LCD TV or monitor PSU

Regarding inputs, this can also be responsible, and may be tested by simply using the TV on different connections. Here the boards :HDMI Input, and AV INPUT .

Before doing anything else call Vizio at the number listed on the owners manual, to verify warranty status and to check the factory quote on repair.

Regards.

Ginko.

May 06, 2010 | Televison & Video

1 Answer

We have a digital display on our Frigidaire stove it is not working and nor is the oven. The elements are fine. Any suggestions please?


Hi.

A technician should read voltage to the electronic oven control board, to test the EOC in full. For safety reasons testing hot wires is an operation that must be done by a repairman.

If there is no power to electronic control, then the wiring harness must be replaced.

If the oven control display is blank I would exclude that the problem is being caused by faulty element, faulty temperature probe, or defective door latch, all this faults do not cause the display and controls being non-responsive.

Most ovens have display, control board and pads as separate parts, in that case the connectors between parts in the control assembly must be tested.

Parts and diagrams for most models are available here.

Regards.

Ginko.

Mar 02, 2010 | Frigidaire Kitchen Ranges

1 Answer

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Hi, the power supply board has a little board towards the connectors. This board has an led and it will blink if there is an error, check how many blinks there are and then check on the on the power PCB next to this little board you will see the error explanation. Also check capacitors on the power board next to the control board connector, replace any bulging ones. I hope this helps.

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I plugged in the power cord and I get no power at all. No lights/nothing? Thanks.


HI

ITS PROBLEM OF COMPUTER SMPS (SWITCH MODE POWER SUPPLY) REPALCE IT ..

TNKS

RABBANEES

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LCD display fault (blank) on Zebra card printer


Hi,
If the printer has blank lcd on standalone this means it is not a computer or system related problem.
Reversing your diagnosis on previous post:
In the Best case it is just a faulty lcd, or lcd ribbon out of place or broken. The relay thing does not make much sense, it is easier to think that it may be any faulty capacitor or IC on main board.
Basically if it prints it is for sure the lcd (display or cable). You can chose to take printer apart or to use it like this, if it does not print or is not recognised by computer, then printer is faulty.

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