LCD Inverter

Symptoms 

Symptoms of damage on each model of inverter board LCD is not necessarily equal to each other. It depends on the design ic inverter and its programs. Broadly speaking inverter board failure symptoms, among others that can be shown are:

• Black screen no picture, but the indicator light remains green flame.
• Black screen no picture, but no sound.
• Flash Screen on-off 1 or 2 times in a few seconds, then die continue or die stand-by (protectionism). On certain models may be shown with a red LED blinking.
• Raster britnes not uniform, due to there are some that are not lit CCFL

 
Various causes damage to the inverter board most frequently encountered.

• Elko dry (ESR values ​​enlarged)
• Fuse break up (as a chip), so there is no Vcc supply voltage (12v or 24v)
• Power FET or Transistors short
• Tranfo high voltage damaged. High voltage coil and a half short, enlarged resistance, or drop out. This can be determined by comparing the resistance of each tranfo High temperatures stress.
• CCFL lamp is damaged (or old), or less contact. To know this must be visually inspected by opening the backlight lamp casing.
• There are loose soldering contacts (observed with a magnifying glass)
• Driver IC is damaged

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