How-To Repair a Desktop LCD with Bad Capacitors
January 17, 2008 By Jeremy Brock
Desktop LCD monitors fail for a variety of reasons, the most common being bad electrolytic capacitors. If you are willing to invest the time you can fix your LCD for a few dollars in parts. For this demonstration I’m using an IBM ThinkVision 6636-AB1 however the same techniques apply to most desktop LCD Monitors.
A+ Perfect Computers, LLC, is not responsible for any damages to your device, person, or property. Computer, Laptop, or LCD disassembly and part installation is at your own risk. This Guide offers only suggestions for taking apart your device. The components inside your device are highly sensitive. Always ground yourself by using an ESD wrist strap or by touching a metal object while handling sensitive electronics.
- No Picture on Screen
- LCD displays picture briefly then turns off
- Soldering Iron
- Desoldering Station or Solder Sucker
- Phillips Head Screw Driver
- Spudger (Available Here and Here)
This LCD would turn on for a second then shut off. These symptoms are usually caused by a bad CCFL light or inverter board. After opening the LCD I did a visual inspection of the PCB looking for any dark areas, damaged IC’s or bad filter capacitors. The top of filter capacitors should be flat, bulging or leaking is an easy way to detect a failing capacitor. If available an ESR meter can be used to validate the capacitor is failing.
In this instance there are three bulging capacitors. Finding replacement LCD components can be tricky however replacement capacitors can be purchased at most electronic part stores. In this case we use mouser.com
To order capacitors enter the Capacitance and Voltage rating into the Capacitor Product Filter on Mouser. Look for the capacitor with the smallest diameter and length, prioritizing a smaller diameter over length if necessary.
Click on an image for a larger picture
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