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Posted on Oct 03, 2008


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
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Sony Bravia KDL-40EX500. Plugged in power and no backlight. No pic no sound. Could it be the power board or inverter board? How can I test these boards? Thanks.

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY LED will automatically begin to fl ash. The number
of times the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY LED fl ash indicators is listed in the
instruction manual for the user's knowledge and reference. If an error symptom cannot be reproduced, the remote commander can be used to
review the failure occurrence data stored in memory to reveal past problems and how often these problems occur.
When an error occurs, the STANDBY LED will fl ash a set number of times to indicate the possible cause of the problem. If there is more than
one error, the LED will identify the fi rst of the problem areas.
Result for all of the following diagnostic items are displayed on screen.
If the screen displays a "0", no error has occurred .
Diagnostic Item
Number of times Standby
LED blinks Possible Location
Main Power Error 2 G2HE/GD2 (Power) Board
Audio Error 3 A (Main) Board
Balancer 4
LCD Panel
Inverter Board (ETC-Inverter MT Board) for 32" & 40" Models
TCON Error
LCD Panel
TCON Control MT Board
HFR Error 5 LCD Panel
Backlight Error 6
LCD Panel
Inverter Board (ETC-Inverter MT Board) for 32" & 40" Models
Temperature Error 7 A (Main) Board

This should help you narrow it down. I am also attaching the service manual for you.

If you need further help, reach me via phone at

Jul 04, 2016 | Sony Bravia Kdl-40ex500 Series 40-inch Lcd...

2 Answers

Flicker at startup, wakeup, and battery power

some latptop do not like the brightness lowered... open control and set brightness to max... this should stop that... sorry

Apr 02, 2015 | Computers & Internet

1 Answer

Power indicater blinks 6 times

"Backlight Error" and the possible location listed is "LCD Panel"
The "LCD Panel" includes the "Inverter MT board" and the "TCON control MT board". The part numbers depend on the serial number of your KDL32BX300. Only one of the inverter boards is available separate from the "LCD Panel". One of the "LCD Panel" assemblies is available for a cost of $518.45. If the serial number of your TV begins with a 5, you are in luck if you would like to replace the "LCD Panel".

Jul 04, 2012 | Sony Televison & Video

1 Answer

Screen blank

Post the manufacturer and model number of the laptop. Model number is located on the bottom of the computer. In the meantime I can only give you a generic diagnosis to follow;

1) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port on the laptop.

This is an example of a VGA Cable, and VGA connector, (Port),

(On the laptop near the VGA port it may have RGB, or External VGA, or nothing )

You can use a CRT type of monitor, (Looks like a small TV), or a flat LCD screen monitor that has a VGA cable attached.

2) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

By factory default settings, the display should show on the external VGA monitor.

IF not; Hold down on the Fn key, and at the same time tap once on the Display Toggle-Over key.

The Display Toggle-Over key will be one of the F keys at the top of the keyboard. (F1 through F12)
HP laptops for example, usually use the F4 key.

After performing the above, there is no display on the external VGA monitor;

There are at least 3 display options available;

1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY

Hold the Fn key down again, and tap once more on the Display Toggle-Over key.

NO display shows on the external VGA monitor?
You have a bad graphics chipset, or the mounting of it to the motherboard is bad.

Display shows on external VGA monitor?
You have a problem with the Video Cable, or in the Display Assembly itself.

A) Video Cable:
This cable connects to the motherboard, under the Keyboard area, or just above it.
It then goes along, and up under the left Hinge.

From there it goes up into the Display Assembly, and connects to the back of the LCD screen.
There is also another wire, or two, that comes from the Video Cable, and connects to the screen Inverter


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 two of them), or a series of LED lights.
(These two technologies are used in the present )

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 Thick, and the length is almost as long as the LCD screen is in height.

2mm is a little larger than 1/16th of an Inch.
More information on CCFL, and general guide to replacing, ]

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

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

Some average examples of a screen Inverter used in a laptop,

The thin plastic 'frame' in front of the LCD screen, is a Display Bezel. Has many names, depends on the manufacturer.

The screen Inverter is located behind the Display Bezel, and mounted at the bottom of the LCD screen. (Usually)

Primer over.

Check the video cable connection on the motherboard side, and at the back of the LCD screen.

Just with opening, and closing the laptop, the video cable could have been pinched in the Hinge.
This would lead to the video cable being pulled on, and pulling a connection loose. (Or both connections)

It could also lead to damage of the video cable.
Check the cable's outside sheath for obvious signs of damage.
This may indicate damage to the tiny wires inside.

It is best to completely remove the video cable, and with a multimeter check the wires inside for continuity. (Set the Function knob to Ohms)

B) Display Assembly:

The Display Assembly consists of the;
1) Display Bezel
2) Display Cover. (Top cover of laptop over LCD screen )
3) LCD screen
4) Hinge brackets, and Hinges
5) screen Inverter
6) Backlighting
7) Web camera (IF installed)
8) Microphone (IF installed in Display Assembly )
9) Screen Frame (Holds the LCD screen assembly together )

If the Video Cable checks out OK, move on to the screen Inverter.
Look to see if the cable (Wires) connections to the screen Inverter are tight.
Physically check, do not assume by just looking.

Is there any obvious signs of damage to the screen Inverter?

To test a screen Inverter requires a sensitive multimeter. Read fairly expensive,

Due to the fact;
1) That most do not have a multimeter of this type around,
2) The ease of accessing to replace a screen Inverter,
3) The usually low cost of the screen Inverter,

, the screen Inverter is replaced. Parts changing I know, but you have to use what is available to you.

Replaced screen Inverter, and you still have no display on the laptop's internal monitor?
Replace the LCD screen.

If a laptop uses CCFL for Backlighting, there is going to be a screen Inverter.
If a laptop uses a series of LED lights for a Backlight, there MAY, or MAY NOT be a screen Inverter.

In this case the LCD screen itself is replaced.

If you post the laptop manufacturer, and Model Number, (In a Comment), I may be able to link you a Service Manual. Also there may be pictorials with disassembly information.

Guide you as if I was sitting next to you.


Apr 28, 2012 | Computers & Internet

1 Answer

Video display will stop after the TV is running for a few minutes. Audio is fine, video goes black. Model 1913-tdxb, June 2007

The tv Long LCD inverter board it is dead.This long LCD inverter provide a backlight for the tv LCD screen panel to have a picture.Tries websites like, to buy a reburbish a long LCD inverter board for the replacement.

Jun 09, 2011 | Polaroid 1913TDXB 19 in. LCD TV/DVD Combo

1 Answer

My s10e lenovo is on but there is no display please guide me what is the solution of it. all lights are on but display is totally blank

Try attaching an external monitor to the laptop & see if you could get any display on it. If this is successful, then you might have either a faulty LCD cable or screen inverter board.
The LCD cable transfers data signal from the motherboard & video card to the LCD screen. It also supplies high voltage DC power to the screen inverter board. The screen inverter board works as a power supply for the backlight lamp mounted inside the LCD screen. It converts low voltage DC power to high voltage AC power needed for the backlight lamp.

Sep 16, 2010 | Lenovo IdeaPad S10e Notebook

1 Answer


Apr 28, 2008 | Televison & Video

1 Answer

No picture

Bad news if you see burned parts the board is a gonner. SMD and very difficult to repair. most time a replacement is the only repair. The board you are looking at is probably the inverter board. the inverter drives the back lights on the lcd display. Some of these boards can be costly. on some of these sets they use combo boards * ie signal and digital and power supply all on one board

Feb 20, 2008 | Audiovox VE920 9" ULTRA-SLIM DROP-DOWN LCD...

3 Answers

My monitor just flickers off, glitches on for a split second, then glitches off. I know its not the settings on the computer because I have another computer that works fine, but when I plug this monitor to...

Hi imkindacool, Sounds like the back light inverter board is bad. It's a very common problem. LCD's use four small cold compact fluorescent bulbs to back light the display. (thats what gives the LCD it's brightness allowing you to see it) The inverter board runs these lights and when they go bad they will typically show symptoms like you have or the monitor power light comes on and you have either no display or a very dim display. If you ever have one that has no display but the power light is on you can check by shining a flashlight directly into the LCD from the front (right into the screen) if you can see an image then it's either the inverter board (most likely) or the CCFL bulbs have gone bad. The inverter board and CCFL's are replaceable. Good Luck, El Duderino

Nov 06, 2006 | Liquid Video L17LCD2 17" Flat Panel LCD...

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