Entertainment Center: TVs, Stereos, VCRs and DVDs - Sony Color TV is now B&W
Doityourself.com community forum was created to provide answers to all questions related to home improvement and home repair. Doityourself community can help you find information about how-to topics on small fixes to large remodeling projects. With comprehensive how-to content and expertly moderated community forums DoItYourself.com makes it easy to tackle even the most complex home improvement projects.View Full Version : Sony Color TV is now B&W
05-24-01, 05:51 PM
Hi,
I have a Sony Trinitron KV-2092AEB/RM-652 TV which was color before I moved. Apparently it was jostled, and now it only picks up black and white. I've had it repaired before for the same thing, and the tech wrote that he'd resoldered connections on the circuit board to fix it. It has a perfect picture (besides the color) and I have the schematic diagran for it. My question is: can I safely figure this out while the set is on, or should I just visually look it over with the power off and see if I notice anything? Any clue as to what connection to inspect?I'd like to keep the set and figure this out, but I'd also like to doitmyself. Any advice would be appreciated.
I have a Sony Trinitron KV-2092AEB/RM-652 TV which was color before I moved. Apparently it was jostled, and now it only picks up black and white. I've had it repaired before for the same thing, and the tech wrote that he'd resoldered connections on the circuit board to fix it. It has a perfect picture (besides the color) and I have the schematic diagran for it. My question is: can I safely figure this out while the set is on, or should I just visually look it over with the power off and see if I notice anything? Any clue as to what connection to inspect?I'd like to keep the set and figure this out, but I'd also like to doitmyself. Any advice would be appreciated.
Smokey
05-24-01, 07:01 PM
Good Evening, cetads:
You know, even the Swiss build a cheap wristwatch now and then. While Sony is one of the empire builders, once in a while they let something through that is not true quality.
On the circuit boards, there are several stages of color amplification of which a bad solder connection in any one of them will produce only a black and white picture. I can't give you a crash course in television theory on this site.
But, if you are willing to take a chance and save a few bucks, here is what I would do:
1)Allow the set to sit for 8 hours.
2) Remove the back of the set. If the AC Power Cord comes off with the set, remove the clip to remove the cord from the back. If it does not, slide the back down to the floor and let's get on with the problem.
3. Turn the set on with the back off. Stand back a bit and let things happen.
4) Grab the mirror out of the hallway and set it in front of the set so that you can see the picture while you are behind the set.
5)Create a wand of plastic or wood (anything non-conductive) and make it long enough to keep you away from the actual electronics of the set (such as the high voltage section).
6) With the set on, use your non-conductive wand and poke, prod, and jar circuit boards usually to the left of the neck of the picture tube. Look for a "sensitive spot". A "sensitive spot" is that spot that you poked that caused the color to appear on the screen. Therein, you have located the bad solder connection.
7) Turn the set off and unplug it. Use a low heat soldering iron and good 60/40 electronic solder (both available at Radio Shack) and resolder the connections on the "solder side" of the board. It requires just a touch of the iron and a touch of the solder. A little goes a long way so don't be adventureous.
8) Remove the iron, remove yourself, and turn on the set (with the back off). Does it make color? If not, repeat all the above steps.
Smokey says this is a job that can be handled at home if you are careful and do not get too adventureous.
Smokey ;)
You know, even the Swiss build a cheap wristwatch now and then. While Sony is one of the empire builders, once in a while they let something through that is not true quality.
On the circuit boards, there are several stages of color amplification of which a bad solder connection in any one of them will produce only a black and white picture. I can't give you a crash course in television theory on this site.
But, if you are willing to take a chance and save a few bucks, here is what I would do:
1)Allow the set to sit for 8 hours.
2) Remove the back of the set. If the AC Power Cord comes off with the set, remove the clip to remove the cord from the back. If it does not, slide the back down to the floor and let's get on with the problem.
3. Turn the set on with the back off. Stand back a bit and let things happen.
4) Grab the mirror out of the hallway and set it in front of the set so that you can see the picture while you are behind the set.
5)Create a wand of plastic or wood (anything non-conductive) and make it long enough to keep you away from the actual electronics of the set (such as the high voltage section).
6) With the set on, use your non-conductive wand and poke, prod, and jar circuit boards usually to the left of the neck of the picture tube. Look for a "sensitive spot". A "sensitive spot" is that spot that you poked that caused the color to appear on the screen. Therein, you have located the bad solder connection.
7) Turn the set off and unplug it. Use a low heat soldering iron and good 60/40 electronic solder (both available at Radio Shack) and resolder the connections on the "solder side" of the board. It requires just a touch of the iron and a touch of the solder. A little goes a long way so don't be adventureous.
8) Remove the iron, remove yourself, and turn on the set (with the back off). Does it make color? If not, repeat all the above steps.
Smokey says this is a job that can be handled at home if you are careful and do not get too adventureous.
Smokey ;)
05-25-01, 03:21 AM
Thanks Smokey!
I'll definitely give it a try--thanks for your time!
cetads
I'll definitely give it a try--thanks for your time!
cetads
Smokey
05-25-01, 07:30 AM
Good Morning, cetads:
Again, start from the side of the set with the channel selector and move slowly toward the picture tube. These boards contain your Intermediate Frequency Amplifiers, Color Amplifiers, Video Amps, etc. A bad connection in this area can cancel the color burst on the signal and give you a black and white presentation.
Once you have soldered on the board, there is a little flux residue left over from the soldering action. Radio Shack will sell you (very inexpensively) a small wire bristled brush to clean up the area after soldering to remove any loose stuff. The excess flux can be washed off with
denatured alcohol (not rubbing alcohol...that has oil in it)
The connections are very close to one another so it is easy to get too much solder on a connection and have it flow across to another trace on the board. Instant short circuit. So, be gentle. In most cases, all you need to do is just reheat the connections with the low heat iron. The old solder will melt and will regain its connection when it cools.
Good hunting.
Smokey ;)
Again, start from the side of the set with the channel selector and move slowly toward the picture tube. These boards contain your Intermediate Frequency Amplifiers, Color Amplifiers, Video Amps, etc. A bad connection in this area can cancel the color burst on the signal and give you a black and white presentation.
Once you have soldered on the board, there is a little flux residue left over from the soldering action. Radio Shack will sell you (very inexpensively) a small wire bristled brush to clean up the area after soldering to remove any loose stuff. The excess flux can be washed off with
denatured alcohol (not rubbing alcohol...that has oil in it)
The connections are very close to one another so it is easy to get too much solder on a connection and have it flow across to another trace on the board. Instant short circuit. So, be gentle. In most cases, all you need to do is just reheat the connections with the low heat iron. The old solder will melt and will regain its connection when it cools.
Good hunting.
Smokey ;)