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How to Fix an LCD backlight power Inverter. Using a Fujiplus FP-988D. For $0.

In this instructible i will walk you through fixing a dead lcd back light power inverter using the parts you have. You can tell if you have a dead back light by first eliminating other possibilities. Check monitor on multiple computers. Make sure the indicator light of the monitor turns on and stays on etc.

For this monitor the problem wound up being two capacitors hit with the "capacitor plague" - (look it up on Wikipedia). and a burnt Surface mount resistor. I sourced all parts from junk i was going to throw out. This was a free fix.

Also be careful when working with capacitors and this inverter in general. It is EXTREMELY highvoltage and capable o giving quite a shock. Also to bridge a fuse like i did - is not very smart. Manufactures are really really cheap - so if they bother to put a fuse into a product - its probably for a good reason.

The only camera i have available is my iphone - which is poor and i apologize. Hopefully you can still get the point. I hope this helps some one. New inverter boards are about 65$ and not worth the price. Hell i only paid 180 for the whole minitor 3 years ago.

be safe

~enjoy
 
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Step 1: Prove its the back light

To prove you have a dead back:
1. turn the monitor while attached to a computer.
2. take a strong flashlight and shine it at the screen
3. look to see if you can make out any dim indication of an image.

*** remember that an lcd screen is like a glass pane. Inorder to see images - there must be a source of light to iluminate it.
I like the "Yeah... It might be that... Let's bridge that fuse... I don't have a 100uF, not a problem, let's use a 330uF..." I really like that kind of hacks ^^
Thanks for the kind words! (I swear there was some logic there)

&& - The LCD still works 4 years later!
zack2472 years ago
unfortunately i wasnt so lucky with 3 15" monitors, the inverters are soldered to the power board, and they seem to be the part that failed, even after replacing all the capacitors the backlights still failed to light, but after testing them with the inverter on my laptop (dont say anything i know it wasnt a smart idea) they are indeed functional, but the inverters are shot.
hopefully i have more luck with this tv i got.
the inverter drives the back lights, its more common for the inverter board to fail, back lights do fail but not so much, if any one is looking for inverter repair service or other plasma lcd tv circuit board repairs, the have a look at this website for more info.

http://www.andyselectronicstuff.co.uk/index.html
motogen4 years ago
i thought fuses are indicated as f or f1 just like on my case  that im working right now,i have here two not working lcd monitors  and the circuitgoinr to he backligths starts on a parts that says f1 and a value that says f 3a/125v so think its a fuse,although it looks like a resistor,i checked it and its says it open using my multi tester
qubic4 years ago
 "If it's not on fire, it's a software problem."
purpulhaze5 years ago
When screen is dim or dark i thought that the back light is bad and needs replacing (not the inverter). I guess by troubleshooting I would will figure out which one it is.
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