Question about Garmin GPSMAP 178C GPS Receiver

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Dark Screen Does anyone know if this Garmin uses a CCFL(Cold Cathode Fluorescent Lamp) and inverter in it's LCD display? I have no display on startup.... Recently repaired the same problem on my laptop (Toshiba) by replacing the CCFL. Thank you

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Almost all LCD use a flourescent lamp, some very new and expensive types use OLED.

Posted on May 27, 2008

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Toshiba satellite M305 S4907 comes on but monitor is blacked out can barley see


http://www.screentekinc.com/Toshiba__Satellite__M305-series-laptops-lcd-screens.shtml

The Toshiba Satellite M305-S4907 Notebook PC, uses a single CCFL for a Backlight.

Primer before we go on;

An LCD screen cannot produce light. It needs an additional light source,

http://solutions.3m.com/wps/portal/3M/en_US/NA_Optical/Systems/BehindTheScenes/Optics101/

Click on the monitor image.

The additional light source is a Backlight.
A Backlight can be a CCFL, (Or two of them), or a series of LED's.
(Light Emitting Diode)

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height.

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

View the last 8 photos.

A screen Inverter is used on laptops that use CCFL for Backlighting.
A screen Inverter converts the power (Electricity), from the laptop, for the LCD screen, and Backlight.

Laptops that use a series of LED's for backlighting, do Not use a screen Inverter.

90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter.

http://www.sparepartswarehouse.com/Toshiba,Satellite,M305-S4907,PSMD8U-02R015B,Laptop,Inverters.aspx

The plastic thin frame in front of the LCD screen, is the Display Bezel. (Toshiba = LCD Bezel)
The screen Inverter is located behind the Display Bezel, and mounted at the bottom of the LCD screen.
(LCD Screen Frame, actually)

Easy to get to; easy to replace.

http://www.irisvista.com/tech/laptops/Toshiba-Satellite-M305/remove-screen-inverter-video-cable-1.htm

How to test a screen Inverter? Requires a Sensitive multimeter.
Read fairly expensive,

http://www.fonerbooks.com/test.htm

Because of this; and the low cost, plus ease of replacing; most home users just opt to replace it.

Know this;
Fluorescent lamps have MERCURY inside. HIGHLY poisonous.
Now couple that with the long thin makeup of the CCFL, and how easy it is to break it.

This is why if the screen Inverter is found to NOT be the problem; I would suggest replacing the LCD screen itself; instead of trying to replace the CCFL, and cause possible Mercury poisoning.

For additional questions please post in a Comment.

Regards,
joecoolvette

Dec 12, 2012 | Toshiba Satellite Computers & Internet

1 Answer

I need a replacement screen and i'm not sure which cffl/backlight to order


Here are the eBay search results for your exact system model -

http://www.ebay.com/sch/i.html?_trksid=p5197.m570.l1313&_nkw=Toshiba+Satellite+L355D-S7809+screen&_sacat=0

Sep 20, 2012 | Toshiba Satellite L355D-S7809 NoteBook AMD...

2 Answers

Toshiba satellite backlight


Mohammad,

Toshiba Satellite P100 screen Inverter replacement;

1) http://www.irisvista.com/tech/laptops/Toshiba-Satellite-P105-P100/remove-lcd-screen-inverter-1.htm

(You can click on any photo to enlarge it. At the top, and bottom of the page are the page numbers. They are in white; Page1 :: Page2 :: Find another model )

2) Primer:
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight (Present technology) is a CCFL, or a series of LED lights.
The Toshiba Satellite P100 series of Notebook PC's uses a CCFL.

Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

Average size is approximately 2mm Thick, and the length is close to the height of the LCD screen. 2mm is a little larger than 1/16th of an inch.

This means the CCFL can be broken quite easily, as it is fragile. (You also DO NOT want to be cut by a Fluorescent lamp )

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

A screen Inverter converts the power from the laptop, for the Backlight, and LCD screen.

As previously stated in a Clarification, 90 PERCENT OF THE TIME the fault is the screen Inverter.

Regards,
joecoolvette

(I never request commendations, but thank you for offering.
We, the older techs here, feel that is begging.
3 years at FixYa so far.
Regards,
joecoolvette)

Mar 23, 2012 | Toshiba Satellite P100 Notebook

1 Answer

Screen has gone cloudy?


Kevin, Kevin, Kevin,.....you should have posted your problem here first.

Primer:
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED lights.

In regards to the Acer Aspire 7720 series of Notebook PC's, the Backlight is a CCFL.

Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
(Approximately 2mm Wide, by close to the height of the LCD screen, Tall )

A screen Inverter is used to convert the power (Electricity) of the laptop, for the Backlight, and LCD screen.

http://www.cdsparts.com/p-97-new-acer-aspire-7720-7720g-7720z-7720zg-series-lcd-inverter.aspx

90 PERCENT OF THE TIME THE FAULT IS THE INVERTER.

The thin plastic frame in front of the LCD screen, (Resembles a picture frame), is the Display Bezel.

The screen Inverter is mounted towards the bottom of the LCD screen, and behind the Display Bezel.

This you already know. Posting for those who read this solution in the future.

Service Manual (Free),

http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-acer

For additional questions please post in a Comment.

Regards,
joecoolvette

Feb 26, 2012 | Acer Aspire 7720 Notebook PC

1 Answer

My toshiba satellite a215-s7472 screen is very dim can hardly see anything what do I do too fix it I tried ajusting the light .


Primer:

An LCD screen does not produce light by itself. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED lights.
(Two present technologies being used)

The Toshiba Satellite A215-S7472 Notebook PC uses a CCFL.

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

(Average size is 2mm by 334mm. In inches that is;
Approximately a little thicker than 1/16th of an inch Thick, and a little over 13 inches Long)

A screen Inverter is used to convert the power (Electricity) from the laptop, for the Backlight, and LCD screen.

Point of all this?

90 PERCENT OF THE TIME the fault is a bad Inverter

http://www.irisvista.com/tech/laptops/toshiba-satellite-a215/disassemble-display-panel-1.htm

http://www.zkarlo.com/selected-zkarlo-part/inverter-board-p907.php

HOWEVER, the Backlight bulb is located inside the Screen Frame, of the LCD display assembly.

An LCD screen is composed of layers. These layers are held in a specific pattern, by the LCD screen frame.

This is a thin metal frame which surrounds the LCD screen layers, and has Philips head screws which hold the frame together.

NOTE*
The procedure is fairly intricate.

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

For additional questions please post in a Comment.

Regards,
joecoolvette

[ So far I have only seen listings for the LCD screen itself, and not a separate CCFL Backlight ]

Feb 01, 2012 | Toshiba Computers & Internet

2 Answers

Screen on laptop advent 7102 very dull can hard use it hardly any brightness


The LCD screen for the Advent 7102 does not produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

An Inverter (Screen Inverter) converts electricity from the laptop, for the LCD screen, and the Backlight.

90 PERCENT OF THE TIME the fault is the Inverter.


The Inverter is a small circuit board located behind the Display Bezel, and under the LCD screen.

[ The Display Bezel is the thin plastic frame in front of the LCD screen. Resembles a picture frame ]

Example of a screen Inverter for an Advent 7102 Netbook PC,

http://www.laptoppowerjacks.co.uk/category-27/Acer12.html


Regards,
joecoolvette

Oct 17, 2011 | Advent Netbook

3 Answers

Does a LCD tv have a bulb in it


Sir lcd has a CCFL it is Cold Cathode Fluorescent lamp and it is powered by the inverter, this light needs a high voltage, the input supply for the inverter board is 24 volts dc. Good day and best regards.

Aug 30, 2011 | Televison & Video

1 Answer

Backlight does not come on even when the unit is plugged in. worked well for golf this afternoon....ideas?


Yes Michael.

90 percent of the time the fault is the Inverter. (Screen Inverter)

{As I'm sure you know,.......
An LCD screen cannot produce enough light by itself. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp.
Similar to the Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

An Inverter is used to convert the electrical power coming from the laptop, for the Backlight, and LCD screen }

The Inverter is located behind the Display Bezel, and at the bottom of the LCD screen, for Many models of laptops.

(Display Bezel;
The thin plastic 'frame' in the front of the LCD screen, and which surrounds the LCD screen.
Part of the Display Assembly)

If I knew the manufacturer name, and model number of your laptop, I may be able to provide a link to a free Service Manual.

For additional questions please post in a Comment.

Regards,
joecoolvette

Jun 30, 2011 | Computers & Internet

3 Answers

My HP compaq nx7300 screen appears to be very dark


Hello
The CFL (cathode florescent lamp) of screen has gone fuse, need replacement,
Good Luck, and do rate the solution if it helps

Dec 08, 2010 | HP Compaq nx7300 Notebook

1 Answer

Lap top dark screen, with system working fine. plugged on external vga, it works.


90 percent of the time the problem is the Inverter.

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

A Backlight is a CCFL.
Cold Cathode Fluorescent Lamp. (Bulb)
Similar to the Fluorescent lamps used in home and businesses, but on a MUCH smaller scale.
(General size is 3 to 5 inches in length, and half the thickness of a No.2 pencil)

An Inverter is used to provide power for the LCD screen, and the Backlight.

An Inverter reduces the power coming from the laptop, for the Backlight.
An Inverter increases the power coming from the laptop, for the LCD screen.

An Inverter is a small circuit board located inside the Display Assembly, behind the Bezel, and usually towards the bottom of the LCD screen.

This is a typical example of an Inverter. It is NOT THE Inverter that you will need.
You have to match the Inverter to the LCD screen. has to be THE Inverter.

http://www.lcdparts.net/InverterDetail3D.aspx?ProductID=2432

Post in a Comment as to the Model Number, and LCVD screen size of your Acer laptop.
(LCD screen's are measured diagonally. From corner to corner)

Nov 24, 2010 | Acer Computers & Internet

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