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the scart socket on the back of my tv is loose and i keep loosing picture so i took the back off and noticed some of the solder is loose.i just want to know to resolder do i have to take the old stuff off or just add new solder over the top?......any body help!

woogie33 Mon 06/10/08 19:12

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vehelpfulguy
Tue 07/10/08
13:40

There are lot if VERY HIGH VOLTAGES round the back of a TV.

If you dont know what you are doing leave it to someone else.

romko
Wed 08/10/08
00:57

as VHG says, this is best left well alone due to potential dangers. if you can't solder you could end up bridging and shorting contacts on the board, and wrecking the set beyond economical repair. At present this is a simple fix for an experienced tech - ideally you want to keep it that way!

that said, soldering is not too hard if you have the right tools and an aptitude for delicate work. Get some old circuit boards to practise on first, and don't attempt anything 'serious' until you are confident.

you will need a 30watt soldering iron with a fine tip , and some resin core solder. you probably won't need to remove the old solder but if it is very bad you can do this with a bit of ,metal braiding from old coax cable dipped in fluxite.

see www.repairfaq.org for some more tips.

beso
Fri 10/10/08
12:59

If you disconnect the power and leave it for a few minutes it isn't going to shock you. Just make sure you don't bridge the terminals.

If you have no experience with soldering it is probably better taken to an experienced person. Try getting some practice on some broken stuff first. If you want to have a go here is the info you want.

If the solder is not connecting to the pins on the socket it could be just "cold" soldered. Solder only sticks properly if the surfaces reach sufficient temperature and heavier components are sometimes not brought to a high enough temperature.

Try reheating and add a dab of electrical solder to get a bit of flux onto the joint. You need to get both the circuit board and pins to the right temperature. This usually needs more heat to the pins. Use the molten solder to help transmit the heat to the required areas. The solder should then flow easily across the surfaces.

However if can also be due to dirty or corroded surfaces. In this case the old solder is best removed. Use some solder wick to remove the old solder and scrape the surfaces clean with a sharp edge. Never use abrasives like sandpaper as these leave residues which inhibit the soldering. A clean joint solders very easily and it is often better to remove the old solder and clean the joint if there is any doubt.

The main worry is damaging the circuit board with excessive heat. This will make the copper lift off. If the solder soesn't start flowing easily and smoothly across the joint this is a real risk as you have to complete the job quickly.

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