Question about Dell UltraSharp 1704FPT 17" Flat Panel LCD Monitor

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Inverter board? Where would I order one?

Same problem here and the solution sounds reasonable. Do you have a part number and source?

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Posted on Oct 15, 2008


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My TV gets power and sound. The picture is on for a bit and then goes blank, then comes back on, then goes blank. What parts do I need to order to fix it?

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

May 17, 2016 | Vizio Televison & Video

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Toshiba Regza 47wlt66 has sound but no picture


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:



Sep 11, 2011 | Toshiba REGZA 47HL167 TV

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We have a hitachi l32h01au tv and the inverter is broken in it. is it difficult to replace and how much can i get an inverter for?

Here is a link to a full list of the circuit boards available for your set from SHOPJIMMY.COM:

And here is a direct link to an INVERTER BOARD currently available there for about $39 US:

You may also find replacement circuit boards on Ebay if you search for your TV's model number or for the exact part number printed on the inverter board itself. Prices may vary slightly on Ebay, but SHOPJIMMY is a very reliable sources of spare parts with consistently fair market prices.

The board replacement procedure is not extremely difficult if you are handy with a screwdriver, have some basic electrical safety knowledge, and a bit of electronics / mechanical repair skills.

You will first need to unplug the power cord from the unit, lay the TV screen side down on something soft and flat like a bed, and then remove the rear access panel or the entire rear cover as required in order to access the circuit boards inside. This will require removing 12 or more philips head screws from the rear panel plastic enclosure.

When you remove the rear cover and access the circuit boards inside, just check the part number that is printed right on your circuit boards and confirm that they exactly match the ones provided in the replacement board listing. If you order the part from Ebay, also make sure that any part you are considering is labelled "TESTED WORKING" in the condition description. Any part with a condition description of "AS IS" is probably faulty.

Then unclip and remove the various electrical wire connectors leading to the inverter boards Then remove the screws securing the circuit board to the TV frame and then remove the board. Be sure to avoid touching any large capacitors on the power supply circuit board while you are in there. They can retain a nasty charge even after the unit is unplugged.

Then just screw in the new circuit board and reconnect all the wire bundles to their appropriate connectors on the new circuit board and then replace the rear cover. Then plug in the power cord and test.
Good luck.


Aug 28, 2011 | Hitachi Televison & Video

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On my Acer AL1916W monitor the screen comes on for a few seconds then goes off but the power light is still green.


That is often an inverter failure. Try turning off the room light, and point a flashlight sticking to the dark screen. If you can see a very faint picture, then the inverter has failed.
Before replacing the inverter, the PSU must also be tested. If the PSU does not supply power to inverter, then the PSU and not the inverter is the part to be tested.

If the screen is not dark, but there is backlight and no picture, then the problem is not the inverter. In that case check the source and the connection cable. If the cable is OK, then it is usually the main controller board inside the monitor. Once again the part must be tested.



Mar 10, 2011 | Acer AL1916W 19" LCD Monitor

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: sound is ok, no picture, happend suddenly, no one turned light down, background light is ok, power is ok

Turn tv on and place a bright flashlight against the screen. Look around the edge for a moving image. This verify that the image is getting to the screen.

It sounds like the back light inverter board should be replaced. This board supplies power to the fluorescent lamps to light the screen.

If this set is under warranty you should return it to get it repair/replace.

IF YOU KNOW HOW TO WORK WITH ELECTRONICS REPAIR(replacing board ) or have a friend with knowledge/skill you can fix it.
If you have a local source for the board you may get it. Or you

can get the part number off the board in your set and search for it. Since this set model is for the UK a general search did not find the part. However if the 'u' on the end of the model is dropped and then google , several sources show up in the USA. I do not know if the inverter board is the same so you will have to verify.

The board looks something like;

Mar 02, 2011 | Sony KDL-26S2010U 26 in. LCD Television

1 Answer

When I push the power button it blinks and never turns on

I recently repaired this exact TV that sounds like the exact problem. First you can take the back off and unplug everything from the Inverter board. The inverter board has the pink and white wire plugs going into it. Then try to power on the TV and if the green light comes on, and stays on, then you know the problem is in the inverter board. My problem was in the inverter and I found Q1500 (N Channel MOSFET) shorted Gate, Drain, and Source together. Just for safe measure I also replaced Q1550 that is the same exact part on that board. I was able to order the parts from and the part # is 2SK2417.

Aug 31, 2010 | Sylvania LC320SLX 32 in. LCD TV

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No picture but I have sound

First possibility to get checked the power supply board.but as you mentioned that there is sound but no picture this clears that power supply is OK.
Sound, but no picture in LCD TVs is indicative of an inverter board failure. This is the board that powers the back lights that project through the LCD screen. An inverter will run about $180 plus labor. An online source for replacement inverter boards is available here. You can cross reference by your Make and model number.

The inverter board looks like this, and is normally supplied by a dedicated voltage from the power supply (24vdc or 60vdc). Most of the Polaroid models use 24vdc.

Its not that difficult, the web site that I provided you with a source for a replacement also has a little tutorial on replacing an inverter. They vary in location by manufacturer, but usually on the left or right side - and look like the picture I provided you. Just be gentle with the cables you have to remove and replace.

The tutorial is here.

this will help.thanks.

Feb 20, 2010 | Polaroid FLM-3201 Television

1 Answer

Screen went black/blank can hear sound no picture, cannot change source or access menu LN-S4692D

Your inverter circuits and/or power board need servicing.....

Either three fault scenarios are happening:

1. the inverter circuits are not producing AC ripple too the CCFL lamps that illuminate the LCD glass panel.

2. the power supply board is not feeding 24vdc - 12vdc sustain voltage too the inverter circuits. Meaning, no dc high voltage output from the power board.

3. The timing control circuit (LCD Board) has shorted switching devices or on-board memory has failed....which causes data/dc loss at the input which results in the inverters canceling load power (lamps). The sync data between inverter and LCD Board are absent. This will result in a 'NO LIGHT' condition on the LCD display.

Number 3 is a rare case, its usually #1 the inverters need servicing.....

Nov 10, 2009 | Samsung LN-S4692D 46 in. LCD HDTV

1 Answer

Audiovox fpe2705 inverter board replacement

You need to verify first that you do have 24vdc feeding the inverter boards, if you do have 24vdc then we can be sure it is the inverter boards. The inverter board will have very small surface mounted fuses, check for that also.

Dec 27, 2008 | Audiovox FPE3206 32 in. LCD Television

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