Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
I have a transistorized Toshiba 19" color TV that I purchased in 1984.
It has worked quite well over the years, but recently has been exhibiting a symptom which I would describe as a horizontal "bleeding" of color under certain conditions. Specifically, bright images on the screen (such as white shirts, brightly-lit windows, white lettering, etc.) will exhibit a bluish bleeding or tearing effect, always horizontally to the right of the bright object. The picture is otherwise very good and stable, with good contrast, color, and brightness. Is this likely to be cause by some kind of adjustment out of whack? Components (maybe condensers?) going bad? As mentioned, this is a transistor set so I know it's not a weak tube causing the problem. Thanks for any help with this! |
#2
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
"pdp11tech" wrote in message ... I have a transistorized Toshiba 19" color TV that I purchased in 1984. It has worked quite well over the years, but recently has been exhibiting a symptom which I would describe as a horizontal "bleeding" of color under certain conditions. Specifically, bright images on the screen (such as white shirts, brightly-lit windows, white lettering, etc.) will exhibit a bluish bleeding or tearing effect, always horizontally to the right of the bright object. The picture is otherwise very good and stable, with good contrast, color, and brightness. Is this likely to be cause by some kind of adjustment out of whack? Components (maybe condensers?) going bad? As mentioned, this is a transistor set so I know it's not a weak tube causing the problem. Thanks for any help with this! picture tube (CRT) showing signs of age, IMO. Time for a new TV. After 23 years, I believe you've got your money out of the Toshiba. |
#3
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
|
#4
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
On Dec 7, 12:29 am, "Deke" no wrote:
picture tube (CRT) showing signs of age, IMO. Time for a new TV. After 23 years, I believe you've got your money out of the Toshiba. Actually I don't really think of the Toshiba as all that old, it's my newest set and I have older ones (vacuum-tube type) that are still in regular use. I don't care much for those strange new futuristic flat sets, and the Toshiba fits perfectly in my home entertainment center -- guess I'll have to keep an eye out for a good used TV that's similar. Thanks for your input... |
#5
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
Try replacing the electrolytic caps on the video driver board. It doesn't
cost much and it's not difficult. |
#6
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
On Dec 7, 8:17 am, "William Sommerwerck"
wrote: Try replacing the electrolytic caps on the video driver board. It doesn't cost much and it's not difficult. Actually this set has just a single circuit board in the bottom of the chassis. (I've gone into it before to tweak the vertical height which started shrinking a bit a few years ago.) Replacing the electrolytics is probably not a bad idea, though, they're pretty likely to be drying out at this point and starting to cause problems. |
#8
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
|
#9
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
On Dec 7, 10:41 am, Bruce Esquibel wrote:
The description of the problem I remember quite well, flaring, comet tails, color bleeding off one edge, always going in the same direction. Don't remember working on Toshiba's but remember the problem was common on Panasonics and Quasars in that period (early/mid 80's). That's the problem exactly. They were probably the 1st generation that used video jungles, complex large scale ic's to near do everything from take in from the tuner and spit out RGB. Same with this set, it has a single circuit board in the bottom with what I would consider to be an amazingly small number of components for a color television. I'd try to narrow down odd ball caps around anything that looks like the video processor ic, 1uf at 160v or 200uf at 3v, anything that is marked that seems lop-sided with rating vs. voltage or visa versa. Sounds like a plan, or maybe I should just recap the whole set, probably wouldn't be much money and just an afternoon's work with a soldering iron. Will have to pull the back off and take inventory of the electrolytics. But I do agree, with it at the quarter-century mark at age, I wouldn't put that much effort in it, rainy day project at best. It will be less work than trying to revamp my entire home entertainment unit for a TV with a different form factor. :-) Also I hate the idea of discarding something that probably just needs minor repairs. I am still seeing new CRT-type sets around for sale that would fit, but they look like cheap Chinese junk that would probably last about six months and would be pretty much unrepairable. |
#10
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
On Dec 7, 2:18 pm, "Dave" wrote:
Your statement harkens up memories of 'me old grandpappy and his dislike of "them newfangled iron horses and moving pictures." I don't mind certain aspects of technology, but still enjoy the glow from my tube amplifier in a darkened room. I just like to stick with what I'm familiar with and works well. (Since you mention it, I have vacuum-tube equipment as well that I still use and keep in repair.) Thanks everyone for the suggestions, I'll have to take a look at replacing some or all of the elecrolytics in this puppy... |
#11
Posted to sci.electronics.repair
|
|||
|
|||
Color bleeding on 19" Toshiba TV
Dave wrote:
You say you do not like "those strange new futuristic flat sets". To each their own, but if you give them a look I think you'll find the picture quality is better than most CRT's. Depends. Given a good video source, I agree. But HDTV is so full of nasty digitization artifacts that I would rather watch an NTSC signal from 100 miles away with rabbit ears. I am not exaggerating. -- Dec. 6 (Bloomberg) -- Government officials and activists flying to Bali, Indonesia, for the United Nations meeting on climate change will cause as much pollution as 20,000 cars in a year. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
LED Showerhead "Color Fusion" changes water color! | Home Repair | |||
Toshiba color TV audio problem | Electronics Repair | |||
Toshiba color problems | Electronics Repair | |||
toshiba 50a61 no color | Electronics Repair |