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Backlight Failure I wonder if anyone can provide me with a contact that can repair the above device. The backlight on the lcd screen has failed. Thanks

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Mitsui, here is the wasp home site maybe you can send it in on an RMA and get them to repair it. http://www.waspbarcode.com/default2.asp Good Luck, Tim

Posted on Feb 09, 2007

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After turn on pc nothing appear on screen


1)Work on a table
Laptop off, remove ALL power.
Remove the AC adapter (Charger) and Battery.

Observe Anti-Static Precautions, and remove the Ram Memory module/s.
Clean the gold plated contact pins on the bottom of the Ram Memory modules with a pencil eraser.
Both sides.

If you do not use a solid eraser, refrain from letting the metal band on the end of the pencil touch the contact pins.
Use air to remove the eraser dust.
You can use air from a can of compressed air for computers if available, or air pressure from your mouth will be sufficient.

Reinstall the Ram Memory module/s.
Close the Memory Compartment Door.
Reinstall the Battery
Plug the AC adapter back in.

Wait 1 Minute, turn the laptop on.

No?

2) Laptop on use a flashlight, and shine it on the LCD screen at an angle. Move the flashlight around.
Do you see faint images?


3) Laptop off. If you have a VGA monitor available, plug the VGA monitor into the VGA connector on the back of the laptop.

http://en.wikipedia.org/wiki/File:SVGA_port.jpg

Turn the VGA monitor on, then turn the laptop on.
Toggle the display over to the VGA monitor by pressing, and holding down on the Fn key, and then tap the F5 key.

Do you see a display on the VGA monitor?



The two above simple tests will tell you if the problem is the Display of the laptop.

In 1) above if there are faint images seen, this means either the Backlight, or Inverter is bad.

An LCD screen cannot produce enough light by itself. It needs an additional light source.
A Backlight is used to provide the additional lighting.

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp (Bulb)
Similar to a Fluorescent light bulb used in homes, and businesses, but on a MUCH smaller scale.
(About 4 inches long, and half the diameter of a pencil)

An Inverter is used to provide power to the LCD screen, and the Backlight.
An Inverter increases power from the laptop for the LCD screen, and reduces power from the laptop for the Backlight.

90 percent of the time the problem is Inverter failure.
The Inverter is a SMALL circuit board located inside the Display Assembly.

Looking at the LCD screen there is a plastic frame which surrounds the screen in Front.
This is the Bezel.
Right behind the Bezel at the bottom of the LCD screen is the Inverter circuit board.

This is an example, of what an Inverter for a Toshiba Satellite U305-S5097 Notebook PC, looks like,

http://product.pelltechnology.com/Toshiba_Satellite_U305-S5097_Backlight_Power_Inverter.asp


In 2( above is there is no display on the VGA monitor, you have a graphics chip problem.
Let me know in a Comment.

Regards,
joecoolvette

Nov 23, 2010 | Toshiba Satellite U305-S5097 Notebook

2 Answers

My laptop screen went black every thing is working but i cant see anything what might be the problem


hold the unit slihtly to a light if you can see the icons dimly on the screen then your screen has gone into freeze mode if you cant see the icons then your screen is probly blown to reset the screen from frozen it needs to be un plugged from the motherboard and plugged back in the plug is located under the panal above the keys

best luck

Oct 14, 2010 | Computers & Internet

1 Answer

Monitor on a emachine 250 computer comes on picture is very light faded in the background but no light


This is a typical symptom of a failing LCD screen inverter board or LCD screen backlight lamp. The backlight lamp failure symptoms are very similar to the inverter board failure symptoms. If you have to guess which one is causing the problem, try replacing the inverter board first. LCD screen inverter boards fail more often than the LCD screen backlight lamps.

Feb 16, 2010 | Acer Computers & Internet

1 Answer

Sound but no picture samsung 40" lcd


It's either the backlight lamp or backlight inverter is busted due to a power failure or fluctuation. Here's how to determine which is which:
  1. Grab a flashlight.
  2. Turn on the TV.
  3. Shine the flashlight onto the screen.
  4. If you cannot see any display even a faint one, the backlight inverter is dead, else the backlight lamps are busted.
  5. Replace which ever is the culprit.

Oct 09, 2009 | Samsung LE26R74BDX 26 in. HD-Ready LCD...

1 Answer

Nokia 5310 replaced LCD screen but still no backlight


i changed my nokia 5310 lcd but still no back light

Sep 15, 2009 | Nokia 5310 Cellular Phone

1 Answer

Sound with no picture..backlight working


This failure could be due to a backlight inverter board or the power supply is not providing the 24 volts to it.
The way to fix it is by measuring the voltages from the power supply to the backlight inverter board, if the voltage is present then the backlight inverter board is defective and will need to be replace. If the voltage is lower then 20 volts, then is a power supply failure.
Click here to find the backlight inverter board.
Let me know if you need further assistance. I repair power supplies for all LCD models.

Jul 24, 2009 | ViewSonic N3251w 32 in. LCD HDTV

1 Answer

Screen is very dim..can barely see it..bright adjust doesnt help.


Hi, your LCD screen's backlight has gone out. This is a hardware failure, and you'll need to have it replaced or repaired. THe LCD screen consists of two parts, the LCD screen which creates images for you to see, and the backlight which forces light through the LCD so you can see it. Your backlight has gone out, so your screen still has images, but no light.

May 17, 2009 | IBM ThinkPad T20 2647 Notebook

3 Answers

The screen is black but if you look hard you can see the background very lightly


Hi, your monitor's backlight is burned out or malfunctioning. The LCD monitor consists of two major parts - the LCD panel where images are created, and the backlight which forces light to pass through the LCD panel so you can see things. Your backlight is out. Viewsonic has great warranty support and service. You should contact them, provide them with the serial number, and they'll probably repair it under warranty for you. This is a hardware malfunction, so it needs to be repaired.

May 15, 2009 | ViewSonic VA1912w 19" LCD Monitor

5 Answers

Samsung LNS2641D 26-Inch LCD HDTV lost its picture


I'm afraid that while their intention was good, that most the posted solutions miss the mark. Let me guide you thru the diagnosis and possible cure. This is detailed and lengthy, since these points appear often in LCD TV/Monitor repair. You may wish to warm up your soldering iron and skip to Step (11) for the repair procedure.

(1) We know that much of the Main Power Supply is working since many of the audio, video and digital processing sections appear to be working (sound, remote control, tuner, and video out).

(2) We know that the Backlight Inverter is working. Even thought the screen appears to be dark, light from the backlight tubes can clearly be observed. Further, even thought the screen is dark, you *can* observe a small amount of the backlight thru the screen.

(3) When working on LCD TVs and Monitors, the typical problem is backlight failure. (Fortunately this is NOT the case here.) Backlight failure is most often due to Backlight Inverter failure, or Main Power Supply failure. Rarely do the bulbs fail outright (although occasionally thru abuse a CCFL tube is cracked or shattered).

(4) The typical failure mechanism on LCD TV/Monitors that have many in-service hours on them is CCFL tube aging. As the CCFL tubes get older they require increasingly higher voltages to maintain the proper regulated current thru them which in turn creates the correct light output. The higher voltage is often beyond the design limit of the Backlight Inverter leading to component failure. Typically discharge breakdown arcing on the output transformers (that drive the CCFL lamps), or drive transistor failure in the Backlight Inverter power supply. Alternatively, the Main Power Supply may fail. Typically the Main Power Supply supplies +12V, or +15V, or a higher voltage (+24V?) to the Backlight Inverter subsystem. Once again, as the lamps age, more current is drawn, and if the Backlight Inverter doesn't fail outright, it draws excessive current from the Main Power Supply leading to either Main Power Supply failure. Alternatively, the Main Power Supply protects itself by shutting down once the excessive current is detected. This can often be seen as "monitor cycling" where by a LCD Monitor will initially power up, but subsequently cycles every few seconds as the Backlight Inverter draws too much current causing the Main Power Supply to shut down. Then, after a brief recovery period, the cycle repeats.

(5) Another failure mechanism, that should not be overlooked, is Electrolytic Capacitor failure. The Internet has many sites documenting either manufacturing defects in Electrolytic Capacitors used in any of the subsystems (Backlight Inverter, Main Power Supply, Digital Signal Processor, etc.). However, more often than not, Capacitor failure is due to component stress-due to the high ripple currents present in inadequately designed switching power supply subsystems. Additionally, many inferior Electrolytic Capacitors of Chinese origin are inadequately designed-they lack trace chemicals in the Electrolyte necessary to assure long service life.

(6) If you suspect any of the mechanisms described which cause an absence of CCFL backlight, you can often use a small pocket flashlight, and observe the screen image *is* in fact present on the LCD panel, but in the absence of sufficient backlight, you mistakenly believed the LCD panel to be dead.

(7) This is not the case here. We can clearly see that the CCFL backlight *is* lit, but we also do *not* observe any image on the LCD panel, even with an external flashlight.

(8) Thru this diagnosis of exclusion we assume that either the LCD panel itself is defective, or that the LCD panel is not receiving the correct drive signals from the Digital Signal Processor subsystem.

(9) A cursory examination reveals that the Digital Signal Processor board is producing output activity, which-even if malfunctioning-would likely produce some sort of LCD display activity.

(10) The LCD panel is totally dark (backlight is on, but no image at all). This failure is so absolute, it leads one to suspect power related problems as opposed to logic or drive problems.

Nov 16, 2008 | Samsung LN-S2641D 26 in. LCD HDTV

1 Answer

Back light on ibm t21


This is an known problem I think you must replace the backlight:
look for example ebay partnr: 260327530145
only for example if this is your problem.

PRODUCTS ITEMS

LCD CCFL BACKLIGHT LAMP IBM THINKPAD T20 T21 14.1" SCREEN

LAPTOP & MONITOR LCD SCREEN PROBLEMS

SOME COMMON SYMPTOMS FOR BACKLIGHT LAMP REPLACEMENT

- Flickering, red or pinkish hue to display and even total darkness. These symptoms are a result of a failed or ageing backlight or a failed, damaged. This is caused by the defective backlight lamp and all you need to do is replace the backlight.

DESCRIPTION

Our high brightness LCD cold cathode lamp (CCFL) with long life, it is more than 50000 hours, with Japanese new cathode, phosphor, glass, and other materials, they are perfect for all LCD backlight application and other purpose, such as instrumentation, medical devices, and all type devices.

COMPATIBLE MODELS
Suit for

Any 14.1” LCD Screen (2.0mm in diameter and 290mm Length) and (2.0mm in diameter and 292mm Length)

CUSTOMER SERVICE / CONTACT US

Email: mkproco@gmail.com (12 Hours Response Time)

Oct 14, 2008 | IBM ThinkPad T21 Notebook

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