Hello, I have repaired many MODIS CCFL back lights. The LT1786FCS Ic that controls current to the florescent inverter and the primary winding capacitor are the problem 99% of the time.
The LT1786FCS receives info via the mother board SM bus.
It then increases or decreases the current to the inverter.
The SMDIC03680TB00KQ00 capacitor is on primary winding.
If it is bad you can only get 1/2 the KV output needed.
I always replace both at the same time.
Here is a link to buy the Ic http://www.linear.com/product/LT1786F
Here is a link to buy the capacitor http://www.mouser.com/ProductDetail/...IbFyINUMQIo%3d
MODIS boards are soldered using re-flow method but these items can be replaced using low temp solder and a small electronics iron.
Be careful removing the old Ic, heat all legs until it easily lifts.
Do Not Pry It Loose! The printed board may peel up with the Ic.
No Fixin That!
I have attached a BMP of the circuit and a BMP to show locations.
If you are not comfortable removing and soldering the Ic, most electronic repair stores will do the work if you have the parts.
Hope this is helpful
The LT1786FCS receives info via the mother board SM bus.
It then increases or decreases the current to the inverter.
The SMDIC03680TB00KQ00 capacitor is on primary winding.
If it is bad you can only get 1/2 the KV output needed.
I always replace both at the same time.
Here is a link to buy the Ic http://www.linear.com/product/LT1786F
Here is a link to buy the capacitor http://www.mouser.com/ProductDetail/...IbFyINUMQIo%3d
MODIS boards are soldered using re-flow method but these items can be replaced using low temp solder and a small electronics iron.
Be careful removing the old Ic, heat all legs until it easily lifts.
Do Not Pry It Loose! The printed board may peel up with the Ic.
No Fixin That!
I have attached a BMP of the circuit and a BMP to show locations.
If you are not comfortable removing and soldering the Ic, most electronic repair stores will do the work if you have the parts.
Hope this is helpful
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