Tip & How-To about Computers & Internet
This tip is a generalized repair based on the inverter board itself and can be considered to be about %75 effective.
Power board repair is pretty much the same as inverter board repair since, unlike LCD Televisions, these 2 components share the same board.
Here is what a typical power/Inverter board looks like.
You will notice, at the top of this power board inverter combo, several cylinder shaped objects. These are called capacitors, and we will be dealing with only these components for this repair procedure, since this is the leading cause of LCD Monitor failures.
You will notice that each capacitor has an X or Y shape grooved into the top.
This X or Y is designed to buckle outwards in the event that the capacitor fails, as shown in this photo.
Your capacitor can also swell out of the bottom and separate it from the board. This will most often show as a black rubber like stopper protruding from under the capacitor. If either condition exists, then this repair is for you.
Ok, so now you have the cause, so lets see if this repair applies to you.
Disassembly of your LCD monitor is actually harder than the repair itself.
The easiest method I know of is to first remove all screws from the LCD, remove the stand then use fingers alone, and slide them under the plastic frame at the front of the monitor.
Prying in this area with ANY tool will most likely crack your screen!
So don't use tools here! You can also use a thin flat piece of steel, such as a butter knife along the outer joint of the plastic frame itself, rocking gently between the joints to separate the locking connectors between the frame and the back plate. Remember that each LCD model is different, so proceed with caution.
If you were successful, you should now be seeing a panel with a silver colored metal RF (Radio Frequency) shield covering both your power board and your VGA connection board. You will need to peel the chrome looking tape, (Copper on some models) back and remove this cover.
You will see some wires going from your LCD screen to your power board/inverter. These are usually colored pink/white and black/aqua.
You will need to remove all of these and mark the power board so you will know how to put them back the way they came off.
Next, you will need to remove the data/video cable leading to your LCD screen. Refer to the image below.
Now you should be able to extract your power board from the Monitor case and replace any swollen capacitors you find. These capacitors will have 3 identifiers that you will need when purchasing replacements.
1. Pico or Microfarad, usually marked like this (330u)
2. Voltage marked like this (25v)
3. Heat range/Tolerance 105c etc.
These are usually listed like this.
CAP ELECT 10000UF 63V SU BI-POLAR
Some may be purchased at radio shack, or an electronics warehouse, I use digikey and other suppliers.
Replace and resolder all Capacitors, also checking for loose components before reassembly and resoldering as necessary.
Remember that these components are very inexpensive (around $1.75 to $3.00), which makes this repair well worth the time and effort, even if you fail to make it work. So before you decide to trash that old flat screen LCD monitor, try this cheap and often effective repair and save a little cash.
Good Luck to ya!
Posted by Bob Sloan on
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