BenQ T701 TFT... | Answered on Sep 16, 2011
Sounds like some bad
electrolytic capacitors, it's easily fixed. I highly recommend
reading the links at the bottom, it'll give a you a better insight
into the problem and solution.
You have 2 or 3
1. If it's under
warranty then you could send it back to be fixed, problem is they
will likely use the same rubbish brand of capacitors again, but
anything else will void the warranty.
2. Pay a tv repairman
or similar to fix it for you. They may still use substandard
capacitors, so specify what brand you want them to use, this will
probably mean waiting longer and possibly paying a little more. This
way you know the job should be done right.
3. You could replace them yourself if you're comfortable with a soldering iron, or know someone who is. The capacitors themselves are quite cheap and easy to replace.
Go for the best ones
you can get for the job and try to buy from reputable companies, the
links below will help you chose but you can't go wrong with Rubycons.
Every capacitor manufacturer has several ranges, each having
different properties which make some more suitable than others
Always match the values
on the original capacitors. You can actually use slightly different
values for the capacitance and voltage (uf and v) but never use ones
below what the originals are rated at.
The links below will
explain this further.
They should look something like this:
As you should be able to see, the one on the left is bulging. The blue stripe with the arrow tells you that the lead on that side is the negative, the positive lead should also be longer than the negative one(only on a new cap, old ones will have been trimmed).
1. Soldering iron. - preferably with a stand with a sponge in.
2. Solder - there's different types so make sure it's suitable for electronics
3. Phillips screwdriver
4. Flat head screwdriver
6. De-soldering wick, or pump. - definitely recommended but not really essential.
If you haven't already got the tools then it's a good investment, as bad caps cause a lot of faults in all kinds of electronics.
1. Unplug monitor and open case.
2. Identify power board, it should have a lot of electrolytic caps on there and obviously should be connected to where the power lead is attached.
3. Identify the bad caps, they should be bulging and/or leaking, although not always. Note down the three values for each cap (eg 220uf, 16v, 105c) and their approximate dimensions, and get new ones, preferably Rubicon or Panasonic, the link below will help you chose some good ones. If in doubt you could remove them and take them to the shop, but you'll have to remember where each one goes and which way round it was (take pics).
4. Very carefully heat up the contact on one side with the soldering iron, and rock the cap the other way, then do the other side, keep doing this until the cap comes out, if you have a de-soldering wick/pump use it to remove the solder and it should just pop out easily.
4. Replace with new cap, making sure that you observe the polarity and make sure it's securely seated and soldered in. Make sure the solder is neat, tidy and doesn't contact anything else. If there's any solder left in the holes then you'll have to heat it up or remove it before you can get the new cap's leads through. Once done properly trim the leads off so they won't cause any problems.
5. Replace casing and test. If it doesn't work then you'll have been a bit messy with the solder, tidy it up and try it again.
Here's a few links to help you:
Bad caps faq - should have pretty much everything you need to know.
Hints on soldering.
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