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Re: hi again!!!
The RCA jacks should be near the signal board. The vertical will be on the same board as the Flyback which Is a large transformer with the large red wires coming out of it. You shold be able to remove the screws in the chassis and slide the chassis out and tip it up so you can see the under side of the boards.
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Unless the jacks have physically broken, replacing them is not the solution to the problem. Generally if both channels are dead, then you will find that a pre-amp IC has failed. This can be found by simply following where the jacks enter the PC board then following the circuit till they go into an IC.
Unroll the wick about 6 inches. Lay about 1/2 inch of wick across the solder joint. (Solder connection on bottom of circuit board)
Put the soldering iron tip on Top of the wick, and on top of the solder joint. When the wick starts to absorb the melted solder, remove the wick. Cut off the solder soaked wick part, so you will have a new wick surface to operate with.
Keep going around the solder joint, until most of the solder joint is removed. You will NOT remove all solder. You are JUST trying to remove the majority.
Perform for all solder joints (Connections) on the bottom of the circuit board, for those RCA jack leads.
GO SLOW. Remove solder from one lead -> STOP Allow the circuit board to cool down. Then continue on.
Circuit board on it's side on the workbench, hold the insulated part of the RCA jack with one hand.
You want to rest your hand on part of the circuit board, (If possible), and use the heel of your hand as a fulcrum. Fingers constantly applying pressure to the jack, pulling jack away from circuit board.
Heat one of the solder connections up on the bottom of the circuit board. Applying pressure with your fingers, see if this one lead will start to come out of the circuit board.
It will only come out so far, as the other leads of the RCA jack are still holding it in. The method is to heat one solder connection, try to pull the lead out of the circuit board a little, then go to the nearest lead; and heat it up. (Heat it up = Melt the solder)
Keep pulling the leads out a little at a time, and going from lead to lead, until they all come out of the circuit board.
NOTE* What look to be very flat thin copper wires, on the bottom of the circuit board, are actually Circuit Traces. Also known as Signal Traces.
IF, you heat the solder joint (Connection), too long, you stand the chance of ruining the circuit board. This = No.
You can lift the circuit trace right off of the motherboard, using too much heat. You can burn the circuit trace 'hole', and this will make it so it will NOT accept solder again. (You can't tin it )
GO SLOW. You have as MUCH time as you need.
Suggest melt one solder joint a little, pull on on it's lead, then allow the circuit board to cool down some. Then go to the nearest lead, heat it's solder joint, pull up; then let the circuit board cool all the way down.
You get the picture
[Leads are the 'stiff wires' coming down from the RCA jack. Circuit trace 'hole', is the hole where the lead goes through in the circuit board ]
When the damaged RCA jack is removed:
There will be residue left behind on the circuit board 'hole'. This needs to be properly cleaned. I use Isopropyl Alcohol, and an old toothbrush.
CAUTION! Isopropyl alcohol is EXTREMELY FLAMMABLE! Use in a WELL ventilated area with NO sparks or flames present.
Yeah, I know. A disclaimer. I just want to make sure you do not get hurt.
Means circuit board well away from the hot soldering iron, when cleaning.
There may also be a thin coat of solder over the circuit trace holes, left behind. DO NOT worry about it/them. Leave alone.
When you go to install the new RCA jack, you will cut the leads until they are about 1 inch long, if not already that length. Bend the leads so you can try a trial fit, and make sure each lead is going towards it's circuit trace hole.
Leads of the RCA jack pushing against (Lightly), the circuit trace hole, and the thin solder 'skin'. When you heat the circuit trace hole from the bottom of the circuit board, the solder 'skin' will instantly melt, and allow the RCA jack lead to poke through.
Don't know if you used to solder back in the day, but solder has changed now. It is 'green', and no longer contains lead. Makes it a @$#@^ if you are soldering with it the first time. Suggest practice on soldering wires together, and perhaps an old circuit board.
The solder joints you make MUST be clean and bright. They should look like a 'Hershey's Kiss' when properly done.
IF, you make a bad solder joint, it is a Cold Solder Joint. This = No. You'll be pulling your hair out trying to figure out what is wrong, when it is just a cold solder joint.
You may wish to also view some soldering tutorials on Youtube,
If that tape deck of yours has an audio line out jack (like the RCA red & white holes, usually located at the back), get an RCA plug to connect it to your stereo receiver's line in jack..... or
if that tape deck of yours doesn't have an audio line out jack but, instead, has phones (or headphones) jack (usually located at the side or front of the unit), then get a plug to connect it to your receiver's audio line in jack (RCA type, also coloured red & white).. Usually the plug is small so you may have to use an adapter for your tape deck's phones jack.
I just fixed this on my TV. With the small front input board removed from the tv, solderside up and the rca jacks pointing away from you begin.Looking at the board in this position locate RCA video jack. Directly in a row are 2 comparitively large solder pads. The pad furthest from the RCA jack and closest to you has a thin trace that runs from the noted pad to a solder pad on a small surface mount component marked 750. That small trace is not making contact on the solderpad that is soldered to the RCA jack. To fix it take a small metal pic or tiny flat screwdriver and scrape away some of the PC board coating right on the trace where it meets the solder pad, and place a small solder bridge on it. Thats it put it back together and watch TV. Thanks to all the members here who post solutions. Frank
Yes, the front RCA jacks on the Sony sets always seem to crack loose. I have seen that many, many times. To get to those jacks, you will have to remove the back of the TV and carefully pull out the main chassis, taking care not to pull out any wires or jacks. When the main chassis slides back, there is a smaller board in front of the main board, and the pushbuttons and RCA jacks are on that smaller board. The connectors to that board usually come off when you slide the main chassis back, so you will need to put those jacks back in place when reassembling. Slide the smaller board back, flip it over and resolder the connections on the RCA jacks. Sometimes I find that the copper trace to the center pin of the video (yellow) RCA jack is broken, so test for continuity and solder a small jumper wire to take the place of the cracked copper trace if necessary. Reassembnle the set and your jacks should be working fine.
Your set uses the 195 series chasis. The only thing I can think of which would make the channels scroll by themselves is a contaminated PC board and pushbuttons behind the buttons on the front of the set. This is usually the case when spray cleaner or some other fluid is sprayed or spilled on the screen, and it drips down onto that board. To prove this, remove the back cover and on the top of the main chassis, where the top of the picture tubes are, is a small PC board with the remote reciever and a couple of jacks. The smaller jack is for the speakers and the larger jack is for the front panel PC board. Unplug the larger connector which goes up to the front PC board and then turn the set on with the remote. If the set works normally, the front PC board will have to be removed and cleaned or repaired (or just leave the jack unplugged and work the TV from the remote only). If you do not have any experience working inside projection sets then allow a qualified tech to handle it for you.
If you got the exact same ones, you should be able to simply pit them back into the same holes. if you did not get the same ones, look at the open holes, two should be connected together, and two are separate. Hook the two that are connected together to the ground part of the jacks, and the middle connections of the jack to the other two holes. if this does not make any since, send a picture of the jacks and the board so we can look at it for you. Good Luck