Question about RCA L37WD12 37 in. LCD HDTV

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Strobe light I got this tv 12/25/2006 as a xmas gift about 7 days ago the picture on the tv started acting like a strobe light effect, first couple of days it would stop after 15 minutes now it is non stop, it was hooked up to cable I removed the box and unplugged the tv as rca recommended and is still doing it any suggestions on what might be going on? Rhonda

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SOURCE: My vizio tv flashes like a strobe light

Sounds like your Backlight Inverter Board is going out, saw one on ebay for about $55 : ) have to get the one for your model tho...

Posted on Aug 21, 2009

  • 3 Answers

SOURCE: my rca L46 WD22 piture began to strobe ???

Turn down contrast.Worked for me.Don't know why. Jeff

Posted on Jan 07, 2010

  • 1 Answer

SOURCE: My Vizio VX42L is flashing like a strobe light.

Capitor C241 On power supply was the problem with my tv. Its under the heat sink.

Posted on Jul 14, 2010

  • 905 Answers

SOURCE: The tv is connected to a hdcable box (comcast) It


Easiest way to identify the problem is to try and use a different TV set with the converter box. If you still have a brightness issue, it is the cable box that is causing problem. Call Comcast.

Otherwise, the tv itself is having issues maintaining a steady brightness, likely due to the auto-brightness control. You didn't mention which tv that you had, but there will be a sensor somewhere on the front of it that detects ambient light intensity. Try blocking this sensor with a piece of opaque tape (like electrical tape) and see if problem disappears. If it does, think outside the box for the root cause.

Were the fluorescent lamps in the room just replaced? Was a fluorescent lamp just added (does it make a difference if all the lights are turned off)?

If it doesn't make a difference, then the inverter for the backlight, or the backlight lamp itself, is near end of life, and needs to be serviced, in the case of a flat panel TV. On a regular tv that has a picture tube, the brightness gain is unstable, and likely requires a service shop.

Posted on Sep 22, 2010

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I've fixed several of these, easy fix, you will need to replace both 470uf 35 volt capacitors on the master and slave inverter boards. So you will have to replace a total of 4 capacitors. The capacitors themselves are about 50 cents a piece. The inverter boards are on the far left and far right of the set. You will have to remove the back cover to see them. If you don't have the ability to replace the capacitors, you can just order new inverter boards for $40-$60.

Dec 09, 2012 | Flat Panel Televisions

1 Answer

My Vizio is 4 years old. Last night when we turned it on it started flashing like a strobe light. It continues to do this. What is the problem? Thank you

We need to find out the strobe effect is due to the T-CON board is turning on and off or if the backlights is turning on and off. This can also be due to unstable power supply due to bad caps.
You need to look at the back of the screen to see if the light coming through on the back side of the LCD panel is stable when the picture is strobing.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors:
Learn about bad caps:
Capacitors kit: he can make you a set of caps.
Or, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.
Please leave rating if it helps.

Mar 04, 2011 | Vizio 42 in. LCD TV

2 Answers

My Vizio VX42L is flashing like a strobe light.

Mine did the same thing. Remove the stand and back of the tv. Be careful with screen do not lay on hard surface and scratch. When you take the back off you will see a board on the left side and a board on the right side. They are labeled slave and master. Remove the ribbon cables and take board out. There are 2 capacitors on each board (about an inch long). These are probably all bad (ends bulged a little with black stuff on bulged end). Radio shack has them for less than $2.00 each. turn the board over and you can read the size of the capacitor. You need someone who can use solder wick and remove all four capacitors and solder in new ones. Notice how the capacitors are turned. Each one is labeled with a dash for negative. Make sure you bend new capacitor connectors the same and put back in the same way. Put the boards back in the tv and attach all ribbon cables. Put back and stand on. hook up your power and cable box and you are ready to watch tv with no more strobe. Me, my husband, and son did ours last week. I looked up the problem on the internet, husband removed stand & back, son with the steady hand did the soldering. Family project that went well for once.

Jun 12, 2010 | Vizio VX42L 42 in. LCD TV

1 Answer


Sounds like you have an LCD tv with backlight problems. Check power board for domed capacitors and replace them. next check connections on the inverter boards. they are on the sides or just one side. Becareful there is high voltage output from these boards. If the cable from inverter board is not good to the screen you can get a strobing. the inverter boards may need replaced. or cales to screen may be bad. The panel also could be bad.

Mar 25, 2010 | Flat Panel Televisions

1 Answer

Philips Magnavox 42 inch plasma white strobe-like blinking

magnovox 42 inch pasma shows tv guide but does not show pciture.

Sep 23, 2009 | Flat Panel Televisions

1 Answer

Flashing picture

I had the same problem with my 237V, I had to replace the power supply to fix the problem. I believe when it would work the output voltage of the power supply was around 19.2v. When the screen started to strobe the voltage had jumped up to 21.5V. A new power supply fixed it for me but now I think my main board is on the fritz.

Sep 09, 2009 | Olevia LT37HVS 37 in. LCD HDTV

2 Answers

Vizio tv flashing

change your inverter board and it should resolve the problem

May 23, 2009 | Vizio L32 32 in. LCD HDTV

1 Answer

The picture blinks like a strobe light

The backlights and their power supply has to be replaced to fix the set. You will have to bring the set in for service to have this done.

Jerry G.

Jun 04, 2008 | Sharp Aquos LC-46D62U 46 in. LCD HDTV

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