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Planar PL191M backlight down afer secondes

the backlight shut off after 1 to 10 secondes but the green power LED still on so i can see displaying with a flashlight. the IC in inverter board is TL1451 please help

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SOURCE: Backlight inverter

A backlight inverter is the power supply to power the lamp or lamps in an LCD display, so when you look through the LCD there is a souce of light behind it. Kind of like holding a peice of paper up to a light and looking through it, The light from behind shines through the paper or in your case the LCD display. You would have to open up the LCD case in order to find what is usually a long thin board, similar to the one below. This may need to be replaced or you may get lucking and just be able to replace the F1 (fuse) component and fix it. (or have a techical friend do it for you)

Posted on Oct 19, 2008

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SOURCE: Hello,

Try eBay for those parts.

Posted on Feb 20, 2009

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SOURCE: Monitor black screen with blinking amber/green light

You need to reset the display. The display is in a safe mode. Resetting the display is a simple procedure and Planar has the instructions on their website in their online customer support section.

Posted on Feb 26, 2009

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SOURCE: Planar Pe191m goes dark image seen with flashlight

I would suspect either the power suuply or inverter circuits, look for bad caps first which is common problem, see example of failed monitors due to bad caps:
If you want replacement lamp, you can look here, it also gives you info on how to measure the lamps dimensions:

Posted on Mar 09, 2010

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SOURCE: Acer AL511 15" I need advice in repairing this

Ok so what is your question exactly, I do not see a question in there?

Posted on Sep 28, 2010

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Had the same thing with my LG, this is the advice I got : 'it sounds like power supply failure, which may be capacitors,'. Not had it done yet, so can't say more.

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Klv32s310A sony bravia gets start on with green light and after a second turns to stand by mode blinking the red light 6 times after each 2 second interval

Hello Sagar,
green led means tv powered on and status ok.
Red blinking light almost always means defect, overcurrent or overload.
6 blinks for Sony lcd flat tv means trouble in backlight circuit, or backlight inverter (backlight illumination or lighting makes your tv screen visible).
common problems in the inverter circuit, which drives the backlight, or shorted drivers, or short-circuit transformers or open circuits.
You should find the problem in the inverter circuit, or in the power supply board or in the main board.
Also look for bad capacitors (electrolytic caps) which are bulged and swollen on top.
Decoupling plugs from printed circuit boards can help you in finding the problem board by elimination method.
If you power up the set after unplugging certain plugs on f.e. the inverter board , this could result in getting a green power led and concluding that this board is faulty.

Walter from Antwerp, Belgium.

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1 Answer

PL191M works for 10 seconds, then goes off with small green light blinking. If I turn it off and back on again, it works for 2 seconds and goes back off. The owner's manual says to push the upper...

There is a couple of possibilities and things to eliminate.
Your monitor is acting like it's not getting a signal. First make sure your video cable is plugged in and tightly connected with the screws fully torqued down. Test the video card by wiggling the connected cord to see if the monitor comes on even temporarily. Try opening the case and re-seating the video card.
If you can get the monitor to stay on long enough go into the control panel and the properties page and make sure you screen saver or power management for energy savings is not set to zero.
If it's new you may have to go the your control panels add remove components and un-install the video card then re-install the driver again. Windows is famous for this requirement.
If you are using this as a second monitor connected to a laptop you will have to hit the corresponding function key on the top row of your keypad, F4 or ?...., to open the port to avail the signal.
On a mechanical level at the monitor depress the Menu button and try a few sizing adjustments to bring the picture back to shape.
Cable - HDMI, USB, VGA ? You may need an adapter to get the signal VGA to HDMI etc.
We need more information but try these things to start.
  • New Monitor
  • 2nd Monitor for laptop
  • PC or Mac
  • Type Cable
  • What happened when it quit working
  • Has it ever worked.
Let us know how we can help further.

Sep 16, 2011 | Planar PL191M 19 in. Flat Panel LCD...

1 Answer

I have a Planar 1910(Black) LCD from a friend. It first had a problem where it would show no display but the power LED would flash green to orange. I fixed the problem by reseting it. Now that the display...

It has white screen becuase it may not be getting the 5vdc from the logic board to the T-CON board or the board has blown fuse.
Please see

Also look to see if power supply/logic bd had any bad caps also.

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1 Answer

Hi, when power is applied the monitor displays a picture for about a second and then the picture goes off. The power LED stays green. any help is appreciated, thanks. Mike Nedin

Look for bad caps (bulging tops) in the power supply, also verify that you do have the 12vdc feeding the backlight inverter circuits. The problem can be bad power supply, bad backlight inverter, and bad lamps.
See example of failed monitors due to bad caps here:
90% of monitors I repair are due to bad caps.

Jan 21, 2010 | Computers & Internet

2 Answers

Lost picture. When using main power button, the

Tries unplug,replug the tv an hour later might work.But this a temp.fix,must replaced the backlight video board sooner or later.

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I have acer extensa 4620. it is showing problem in start time. that is :- when we on laptop green LED on and after few second auto off and not show display. if we connect adopter with laptop and then...

ok.. we need to do some translation first:
1. 'we on laptop green led on' ---> what picture is right above the green led that is on?? is it the battery? is it the little computer and it says says "on"? which one??
2. "auto off' ---> are you saying that the computer shuts down by itself? or is the green led that goes off completely?

just to try to shoot an answer to ya with what I can get out of your question is that you may have a problem with the battery or most likely with the a/c connector that goes to your motherboard, check if that connector is loose, check if it's secured, if it's loose you may have to have some one sold it back on

it could also be the inverter, an electrical component on your laptop that converts dc to ac so you have backlight on your laptop monitor.. it could be failing... or it could be the backlight itself that is failing. there's a a little retractil button that you can press to 'reset' the backlight (like closing the opening the the monitor panel), press that little button and see if you get an image again.. some times you may need to do it until it starts working again on it's own.

good luck to you!

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who changed the caps and what caps did they change, also there are two switches on the board one should be normal and the other on 30v

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