Monitor troubles

Mightycamels · 31 Jan 2011 at 23:59

My monitor, one morning decided to only turn on for a second or 2 and then turn off. Tried it again and same thing. For that second or 2 its fine but then all black again.

I then spent some time faffing around setting my tv up to my computer instead and went on a google mission.

I decided that it could be bad caps.

So taking my monitor apart tonight (which was fun) I noticed 2 things

First (beware I know nothing about electronics) there is on it what I am going to call "jizz" on some parts of it (could be some sort of insulator I guess)

The second is that some of the caps have black on their tops. None of them are bulging

It's only a cheapo AOC 19" LCD. Model number M19W

I have a new benQ monitor on order but it's just sitting here broken until it arrives and I can't stop thinking if it only costs a few quid and a bit of soldering, why not give it ago

If anyone got any idea let me know

Cheers

gbaromman · 1 Feb 2011 at 12:29

the "jizz" as you call it could be like soldier to keep the components in ? not sure myself but that would be my guess

PCM2 · 1 Feb 2011 at 14:20

Solder is shiny and metallic and would be found underneath the circuit board mainly. I believe the white 'waxy substance' is intended to protect some more fragile components and help keep them in place. I am not exactly an expert on the subject though

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Ergates · 1 Feb 2011 at 18:42

The black bits look like marker pen - most likely to make it easier to tell the different between similar looking components.

Homeengineer · 1 Feb 2011 at 19:36

1/ The ( jizz ) you see is 'hot-melt' glue. Its put there to hold components from vibration as otherwise they are only held with their wire legs and can easily be broken creating faults. In older electronics , laquer was used but now it's much easier to simply use a glue gun. 2/ The black marks on top of the capacitors / other components are quality control who use a simple ' marker pen ' as they scan ( with their eyes ) for any problems during manufacture . They are known as 'witness marks' and sort of prove to a supervisor that the circuit board has in fact been checked and not just passed over by a worker. The actual fault you describe sounds like an 'inverter' problem that is causing the circuit to shut down. The inverter generates power for the screen at high voltage. These power supply faults can be difficult to diagnose unless you are an engineer with experience of switch mode supplies. I would suggest you leave well alone and either get a proper person to fix it ... or throw the whole thing in the bin . Good luck.

Mightycamels · 1 Feb 2011 at 21:05

Cheers mate, new monitor arriving tomorrow so I will bin it now!

On the plus side it's a good excuse to upgrade as it was only meant to be a tempory thing but ended but using it for 2 and a half years.