Re: Basic Soldering Questions

Ended up buying a 40w starter set for £14.99 and did my repair.

If I use it much I'll buy better kit later on.

Thanks for the advice.

Re: Samsung Syncmaster T240 - Bad Inverter Transformer?

Thanks for all the help guys!!!

I ordered the inverter transformer from Hong Kong and bought a cheap 40w soldering set and I fixed the monitor tonight.

I've never soldered anything before and am quite pleased with my work - shiny joints and quite neat.

Now I need to go and find something else to solder...

I'm just about to order a Weller Sp40 soldering iron and some solder to have a go at removing some components from an old motherboard and resoldering them before I try to fix my PC monitor but I'm a bit confused by the labelling on rolls of solder.

Is resin and rosin core solder basically the same thing and if so would Weller EL60/40-100 (1mm thick) solder be okay to use?

Is the Weller SP40 soldering iron adequate for this type of work?

I'm not looking to break the bank here. If I find I have a knack for this type of work and want to take on a bigger...

Re: Samsung Syncmaster T240 - Bad Inverter Transformer?

So just to be clear, when the meter is showing 1 is that it reading open circuit?

I'll need to go and buy a soldering iron now I guess.

Re: Samsung Syncmaster T240 - Bad Inverter Transformer?

I can't get a reading on C301 and C302. My meter only has up to 2M range and it's showing 1. for those two.

C305 shows 931 ohms and R302 shows 149.7k ohms.

Re: Samsung Syncmaster T240 - Bad Inverter Transformer?

Okay, so I've not got a spare CCFL to test with and I've not taken the panel apart to look at them so I did the following test:

1) Plugged the bottom set of lights into the bottom connector (rightmost in the picture) and powered up. No image at all.

2) Plugged the top set of lights into the bottom connector. No image at all.

3) Plugged the top set of lights into the top connector. 2 seconds to black.

4) Plugged the bottom set of lights into the top connector. 2 seconds...

Re: Samsung Syncmaster T240 - Bad Inverter Transformer?

Thanks for the reply. I'll have a look at the CCFLs later but in the meantime here's a few pics of the board....

My monitor has developed the 2 seconds to black fault. I've never tried to fix anything like this before but thought I'd give it a go just for the fun of it rather than pay someone else to do it and you guys make it sound really easy.

I removed the power board from the monitor on from a quick visual inspection all appears well with the capacitors.

Testing the secondary coils on the inverter transformer give reading of 952 and 918. I've read that 3 or 4% variance is enough to suggest a faulty transformer but mine seems to be borderline. Other threads I've read on...