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
|
|||
|
|||
sony triniton 28" tv fell off
My 28" Sony Trinitron TV fell off to its face from about a feet's
height. It first landed on the top left edge of the case & subsequently fell to its face. Now, when I switch on the TV gives a flash once & then shows nothing. I can see the channel number, AV1, AV2 etc. on the top left but in red colour (it used to be shown in green). I can see the progress bar for volume when I change the volume. But I can't see the picture. Audio is perfect. I think the picture tube is gone but I want to be sure about it. Is there any way to confirm this myself without the help of a technician? I opened the TV to see if there are any cracks on the CRT but there are none. Any information in this regards os much appreciated. Thanks in advance. |
#2
|
|||
|
|||
Sunitha Kode ha escrito: My 28" Sony Trinitron TV fell off to its face from about a feet's height. It first landed on the top left edge of the case & subsequently fell to its face. Now, when I switch on the TV gives a flash once & then shows nothing. I can see the channel number, AV1, AV2 etc. on the top left but in red colour (it used to be shown in green). I can see the progress bar for volume when I change the volume. But I can't see the picture. Audio is perfect. I think the picture tube is gone but I want to be sure about it. Is there any way to confirm this myself without the help of a technician? I opened the TV to see if there are any cracks on the CRT but there are none. Any information in this regards os much appreciated. Thanks in advance. sounds like you are at least getting a picture, but no video signal. I'd say a board has got cracked. With the set on and the back off,try poking the boards with a wooden rod or cooking utensil to see if you can get a video signal back on screen and then locate the cracks. in any case, from the discolouration you mentioned , I'd say the tube is damaged. This is probably not feasible to repair. good luck, B. |
#3
|
|||
|
|||
It is possible that the tube is damaged from the drop. There is a
chance that the circuit board may be damaged. If you are not trained in TV service, you should have a TV service center look at it, and give you an estimate. Jerry Greenberg |
#4
|
|||
|
|||
"Sunitha Kode" wrote in message oups.com... My 28" Sony Trinitron TV fell off to its face from about a feet's height. It first landed on the top left edge of the case & subsequently fell to its face. Now, when I switch on the TV gives a flash once & then shows nothing. I can see the channel number, AV1, AV2 etc. on the top left but in red colour (it used to be shown in green). I can see the progress bar for volume when I change the volume. But I can't see the picture. Audio is perfect. I think the picture tube is gone but I want to be sure about it. Is there any way to confirm this myself without the help of a technician? I opened the TV to see if there are any cracks on the CRT but there are none. Any information in this regards os much appreciated. Thanks in advance. You've probably cracked a circuit board, that part is usually pretty easy to fix. The part that concerns me though is the menu being red instead of green, that could indicate that the aperature grill inside the tube has shifted, in which case you'll never be able to get the purity right and it'll always have off-colored blobs but it's hard to know without fixing the board, could be just fine. |
#5
|
|||
|
|||
My 28" Sony Trinitron TV fell off to its face from about a feet's height. It first landed on the top left edge of the case & subsequently fell to its face. Now, when I switch on the TV gives a flash once & then shows nothing. I can see the channel number, AV1, AV2 etc. on the top left but in red colour (it used to be shown in green). I can see the progress bar for volume when I change the volume. But I can't see the picture. Audio is perfect. I think the picture tube is gone but I want to be sure about it. Is there any way to confirm this myself without the help of a technician? I opened the TV to see if there are any cracks on the CRT but there are none. Any information in this regards os much appreciated. Thanks in advance. I think you have two problems with this set. The no picture fault might have been worth repairing, But the colour purity problem you see on the on-screen graphics is almost certainly caused by the trauma the set suffered buckling the aperture grille inside the CRT. The construction of the Trinitron aperture grille is lighter and more easily damaged than other types of CRT. -- Graham. %Profound_observation% |
#6
|
|||
|
|||
"James Sweet" wrote in message news:vG_%e.9445$UD6.2205@trnddc04... "Sunitha Kode" wrote in message oups.com... My 28" Sony Trinitron TV fell off to its face from about a feet's height. It first landed on the top left edge of the case & subsequently fell to its face. Now, when I switch on the TV gives a flash once & then shows nothing. I can see the channel number, AV1, AV2 etc. on the top left but in red colour (it used to be shown in green). I can see the progress bar for volume when I change the volume. But I can't see the picture. Audio is perfect. I think the picture tube is gone but I want to be sure about it. Is there any way to confirm this myself without the help of a technician? I opened the TV to see if there are any cracks on the CRT but there are none. Any information in this regards os much appreciated. Thanks in advance. You've probably cracked a circuit board, that part is usually pretty easy to fix. The part that concerns me though is the menu being red instead of green, that could indicate that the aperature grill inside the tube has shifted, in which case you'll never be able to get the purity right and it'll always have off-colored blobs but it's hard to know without fixing the board, could be just fine. A simillar drop onto the bottom right hand corner should fix it ;O) Seriously it is worth a try before binning the tube. I remember the days when a firm thump to the side of the set would cure 99% of television faults :O) |
#7
|
|||
|
|||
"Sunitha Kode" wrote in message oups.com... My 28" Sony Trinitron TV fell off to its face from about a feet's height. It first landed on the top left edge of the case & subsequently fell to its face. Now, when I switch on the TV gives a flash once & then shows nothing. I can see the channel number, AV1, AV2 etc. on the top left but in red colour (it used to be shown in green). I can see the progress bar for volume when I change the volume. But I can't see the picture. Audio is perfect. I think the picture tube is gone but I want to be sure about it. Is there any way to confirm this myself without the help of a technician? I opened the TV to see if there are any cracks on the CRT but there are none. Any information in this regards os much appreciated. Thanks in advance. The other posters are most likely right IMO- the aperture grille in the CRT is damaged/shifted. I managed to restore a rather badly damaged (dropped) Trinitron by a lot of fiddling with the yoke rings and placing magnets on the CRT, but I guess I was lucky, and had too much time on my hands ;-). You may find a few degauss cycles lessens the symptoms, but it isn't very likely. Also it's worth considering that the integrity of the CRT may have been compromised. It may not be visible, but there may be weaknesses in the glass which could prove dangerous. You don't say what kind of surface it fell on, but if it was concrete, I'd be wary. Dave |
#8
|
|||
|
|||
Can you say "Implode!"
"Dave D" wrote in message news "Sunitha Kode" wrote in message oups.com... My 28" Sony Trinitron TV fell off to its face from about a feet's height. It first landed on the top left edge of the case & subsequently fell to its face. Now, when I switch on the TV gives a flash once & then shows nothing. I can see the channel number, AV1, AV2 etc. on the top left but in red colour (it used to be shown in green). I can see the progress bar for volume when I change the volume. But I can't see the picture. Audio is perfect. I think the picture tube is gone but I want to be sure about it. Is there any way to confirm this myself without the help of a technician? I opened the TV to see if there are any cracks on the CRT but there are none. Any information in this regards os much appreciated. Thanks in advance. The other posters are most likely right IMO- the aperture grille in the CRT is damaged/shifted. I managed to restore a rather badly damaged (dropped) Trinitron by a lot of fiddling with the yoke rings and placing magnets on the CRT, but I guess I was lucky, and had too much time on my hands ;-). You may find a few degauss cycles lessens the symptoms, but it isn't very likely. Also it's worth considering that the integrity of the CRT may have been compromised. It may not be visible, but there may be weaknesses in the glass which could prove dangerous. You don't say what kind of surface it fell on, but if it was concrete, I'd be wary. Dave |
#9
|
|||
|
|||
"Michael Kennedy" wrote in message ... Can you say "Implode!" That really shouldn't be much concern, modern TV's are designed so that an implosion that sprays anything beyond the enclosure is very unlikely, now with the back off it's a whole different story but the face of a CRT is made of very thick glass and the shadow mask helps shield any internals. |
#10
|
|||
|
|||
What color is the volume bar? What color is the volume bar supposed to be?
Is the color of the volume bar and the channel numbers consistant? (not changing shades of red or green) Are the red channel numbers possilby from the tv not recieving any signal on those channels because of a broken circuit board? Try using a composite input and see what happens on AV1 and AV2. - Mike "Sunitha Kode" wrote in message oups.com... My 28" Sony Trinitron TV fell off to its face from about a feet's height. It first landed on the top left edge of the case & subsequently fell to its face. Now, when I switch on the TV gives a flash once & then shows nothing. I can see the channel number, AV1, AV2 etc. on the top left but in red colour (it used to be shown in green). I can see the progress bar for volume when I change the volume. But I can't see the picture. Audio is perfect. I think the picture tube is gone but I want to be sure about it. Is there any way to confirm this myself without the help of a technician? I opened the TV to see if there are any cracks on the CRT but there are none. Any information in this regards os much appreciated. Thanks in advance. |
#11
|
|||
|
|||
Michael Kennedy wrote: What color is the volume bar? What color is the volume bar supposed to be? Is the color of the volume bar and the channel numbers consistant? (not changing shades of red or green) Are the red channel numbers possilby from the tv not recieving any signal on those channels because of a broken circuit board? Try using a composite input and see what happens on AV1 and AV2. Hi... I'd surely want to see some video on it before giving up on the tube. It's even possible that it fell at turn on, failed while de-gaussing. I once turned on a set at about the same instant that hydro failed. What a kalaedascopic (sp?) mess!!! Ken |
#12
|
|||
|
|||
What color is the volume bar? What color is the volume bar supposed to be?
Volume bar is green as it is supposed to be. The mute sign etc. are also displayed in green. Is the color of the volume bar and the channel numbers consistant? (not changing shades of red or green) The channel numbers were half green & red initially & now it is fully red. Try using a composite input and see what happens on AV1 and AV2. Donno what you mean by this. I tried playing a DVD, there is no picture on the screen but audio is fine. -Sunitha. |
#13
|
|||
|
|||
With the set on and the back off,try poking the boards with a wooden
When I tried tapping the circuit board behind the CRT filament, there were color stripes which went on & off here & there. Also noticed that the CRT filament is not glowing. -Sunitha |
#14
|
|||
|
|||
With the set on and the back off,try poking the boards with a wooden rod or
I tried poking on the circuit board behind the CRT filament & saw some colour stripes come & go here & there on the screen. Other thing that I noticed is the CRT filament isn't glowing. -Sunitha |
#15
|
|||
|
|||
"James Sweet" wrote in message news:E_10f.7092$JY6.4126@trnddc02... "Michael Kennedy" wrote in message ... Can you say "Implode!" That really shouldn't be much concern, modern TV's are designed so that an implosion that sprays anything beyond the enclosure is very unlikely, now with the back off it's a whole different story but the face of a CRT is made of very thick glass and the shadow mask helps shield any internals. The aperture grille on a Trinitron would be next to no protection from flying glass, especially if the screen area collapses. However, I agree it is not particularly likely the screen area would fail. I've certainly never seen it happen. It is worth pointing it out to the OP as a risk though. Any TV landing on its face, certainly onto a hard floor, should be treated with caution. Dave |
#16
|
|||
|
|||
Composite would be a connection with RCA cables.. example: a dvd player with
yellow video and red and white audio wires, not through the antenna port anything you use on AV1 or AV2. Sounds to me like possible screen mask damage and circuit board damage. I'd fix the board before making any decisions about the CRT tube. - Mike "Sunitha Kode" wrote in message oups.com... What color is the volume bar? What color is the volume bar supposed to be? Volume bar is green as it is supposed to be. The mute sign etc. are also displayed in green. Is the color of the volume bar and the channel numbers consistant? (not changing shades of red or green) The channel numbers were half green & red initially & now it is fully red. Try using a composite input and see what happens on AV1 and AV2. Donno what you mean by this. I tried playing a DVD, there is no picture on the screen but audio is fine. -Sunitha. |
#17
|
|||
|
|||
By the way, if you are getting channel numbers and volume bars on the screen
that means the CRT tube is working, but something must be wrong with the electronics. The discoloration may indicate damage to the CRT but never the less you should be able to get some sort of picture when the circuit that is damaged is fixed. - Mike "Sunitha Kode" wrote in message oups.com... What color is the volume bar? What color is the volume bar supposed to be? Volume bar is green as it is supposed to be. The mute sign etc. are also displayed in green. Is the color of the volume bar and the channel numbers consistant? (not changing shades of red or green) The channel numbers were half green & red initially & now it is fully red. Try using a composite input and see what happens on AV1 and AV2. Donno what you mean by this. I tried playing a DVD, there is no picture on the screen but audio is fine. -Sunitha. |
#18
|
|||
|
|||
"Ken Weitzel" bravely wrote to "All" (03 Oct 05 04:18:25)
--- on the heady topic of " sony triniton 28" tv fell off" KW From: Ken Weitzel KW Xref: core-easynews sci.electronics.repair:343960 KW Hi... KW I'd surely want to see some video on it before giving up on the tube. KW It's even possible that it fell at turn on, failed while de-gaussing. KW I once turned on a set at about the same instant that hydro failed. KW What a kalaedascopic (sp?) mess!!! Ken, I agree with you that there may be nothing wrong with the crt. The red colour channel numbers might be the cpu indicating a problem and as such is a normal display. In that case the circuitry has been damaged. A*s*i*m*o*v .... I ran Doublespace on my monitor & get 2 more TV channels. |
#19
|
|||
|
|||
The red colour channel numbers might be the cpu indicating a problem
I concur. Also, there is a difference between red/used to be green and red/used to be pale green. The channel numbers may always have had some red in them, you just never noticed it under the green. I've fixed a lot of dropped tv's and monitors by resoldering connections that popped loose. Make sure you check all of the solder connections, esp. the ones on the tube socket and in places where boards come together. |
#20
|
|||
|
|||
On 3 Oct 2005 03:45:07 -0700, "Sunitha Kode"
wrote: With the set on and the back off,try poking the boards with a wooden When I tried tapping the circuit board behind the CRT filament, there were color stripes which went on & off here & there. Also noticed that the CRT filament is not glowing. -Sunitha The CRT may be gone, for sure. Usually with a set of this size following the board cracks around the FBT also. You never know...if you do get it going, a degauss may take care of the possible CRT problem. Tom |
#21
|
|||
|
|||
28`` ? probably a 27`` set . Good reason to chuck it and get one of
those new cool flat LCD sets :-) |
#22
|
|||
|
|||
On 3 Oct 2005 14:05:03 -0700, "
wrote: The red colour channel numbers might be the cpu indicating a problem I concur. Also, there is a difference between red/used to be green and red/used to be pale green. The channel numbers may always have had some red in them, you just never noticed it under the green. No Sony TV I have ever seen has used anything but pure green for the channel numbers. Andy Cuffe -- Use this address until 12/31/2005 -- Use this address after 12/31/2005 |
#23
|
|||
|
|||
Sunitha Kode wrote:
With the set on and the back off,try poking the boards with a wooden When I tried tapping the circuit board behind the CRT filament, there were color stripes which went on & off here & there. Also noticed that the CRT filament is not glowing. -Sunitha filament has to be on u have OSD!! u have prolly a cold solder / cracked board somewhere |
#24
|
|||
|
|||
"Sunitha Kode" wrote in message oups.com... With the set on and the back off,try poking the boards with a wooden When I tried tapping the circuit board behind the CRT filament, there were color stripes which went on & off here & there. Also noticed that the CRT filament is not glowing. -Sunitha If you got anything at all on the screen then the filaments are glowing, they just may be obstructed by other structures in the neck and difficult to see. You'll have to repair broken circuit board before you'll know anything else, the tube is clearly still working, no way to know if the purity will be ok until you can at least get a picture. |
#25
|
|||
|
|||
James Sweet wrote: "Michael Kennedy" wrote in message ... Can you say "Implode!" That really shouldn't be much concern, modern TV's are designed so that an implosion that sprays anything beyond the enclosure is very unlikely, now with the back off it's a whole different story but the face of a CRT is made of very thick glass and the shadow mask helps shield any internals. About 15 years ago, I thought an imploding picture tube would be cool, so some friends and I found an old TV in the dump, and while hiding down behind a mound of dirt 15 or 20 feet away, we threw a heavy metal fence post at it. Repeatedly. Then we walked up to the TV and rammed it with the post or swung at it over and over again. Eventually, we got a few cracks in the screen. Nothing dramatic except that we were all out of breath from taking turns swinging the fence post. I couldn't believe how tough the glass was. No idea about the strength of the back side of the tube, though. |
#26
|
|||
|
|||
wrote in message oups.com... James Sweet wrote: "Michael Kennedy" wrote in message ... Can you say "Implode!" That really shouldn't be much concern, modern TV's are designed so that an implosion that sprays anything beyond the enclosure is very unlikely, now with the back off it's a whole different story but the face of a CRT is made of very thick glass and the shadow mask helps shield any internals. About 15 years ago, I thought an imploding picture tube would be cool, so some friends and I found an old TV in the dump, and while hiding down behind a mound of dirt 15 or 20 feet away, we threw a heavy metal fence post at it. Repeatedly. Then we walked up to the TV and rammed it with the post or swung at it over and over again. Eventually, we got a few cracks in the screen. Nothing dramatic except that we were all out of breath from taking turns swinging the fence post. I couldn't believe how tough the glass was. That can be the problem though. It doesn't break straight away, but has hidden stress fractures which could fail unexpectedly days, months or even years later. Having said that, it is rare for the front glass to fail on a CRT. I had a similar experience with glass in a scrap car. At our local scrapyard the guys were trying to get into a Nissan Laurel they couldn't find the keys for. Trying to look cool, one of them swung a spanner at the side window, nothing. He picked up a half-brick sized rock, threw it at the glass, nothing. He picked up an exhaust manifold and threw it at the glass, nothing. He eventually cracked it with a hammer. Glass is strange stuff. No idea about the strength of the back side of the tube, though. Not as strong, but I've never seen that go either. I've done a few tubes where the whole neck, guns and all, has flown into the tube, but nothing more spectacular. Dave |
#27
|
|||
|
|||
My friend and I tried a rock. A big one, about a 20 pounder. It
probably didn't help that it was so hard to throw, but that and our lousy aim from "safe distance" outside the "blast radius" made for an exhausting ordeal. I remember that we knocked the phosphor off the inside surface of the tube with one blow in a very interesting star-shaped pattern. I wonder if anyone's modeled a CRT with Bessel functions before. We eventually did smash the front in, and it was quite a celebration that ensued, but we never tried it again because bashing a TV in is just too much work. |
#28
|
|||
|
|||
Had a similar experience with an old Sony. We were cleaning the shop and
dumping old junk. We had several televisons. We thought it might be fun to take out our frustrations with a sledge hammer. A Hitachi required a tap. Same for the JVC. When we got to the Sony, we all exhausted ourselves. Finally a burly manager type came out and gave his all. It cracked. Then the rest of us were able to do some damage. Because the Sony tubes have always been flat (at least in one direction) they have very thick glass for the screens. By the way, the backsides are every but a fragile as any other tube (experience speaking....oops). PoD |
#30
|
|||
|
|||
On 7 Oct 2005 03:02:11 -0700, "
wrote: My friend and I tried a rock. A big one, about a 20 pounder. It probably didn't help that it was so hard to throw, but that and our lousy aim from "safe distance" outside the "blast radius" made for an exhausting ordeal. I remember that we knocked the phosphor off the inside surface of the tube with one blow in a very interesting star-shaped pattern. I wonder if anyone's modeled a CRT with Bessel functions before. We eventually did smash the front in, and it was quite a celebration that ensued, but we never tried it again because bashing a TV in is just too much work. It certainly wasn't as difficult 30+ years ago...my friends and I found an old CRT in the woods, and one shot on the front glass with about a 5 or 6 pound rock and it was a goner. Tom |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Sony Triniton pincushin problem | Electronics Repair | |||
SONY TRINITON TV PROBLEMS | Electronics Repair | |||
1991 Sony 8MM Camcorder real wierd problem --need expert help | Electronics Repair | |||
Sony G500 Monitor Repair | Electronics Repair | |||
Sony G410R Monitor problem (and bad Sony support) | Electronics Repair |