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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. |
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~28" RCA TV - no picture, sound works
Hi All,
I've got a ~28" RCA "Entertainment Series" TV. It's a little over 2 years old (just out of warranty, of course), and the picture is totally gone. Sound is working fine. A couple days ago, I noticed when I turned it on, I heard what I assume is some type of relay click (per normal), then a couple seconds later, it clicked off again, and the tube never lit. I tried it 2x more times, and the 2nd time it worked. I chalked it up to a quirk, but it left a bad feeling in my stomach. Tonight I went to turn it on, I heard the click, then it "clicked off" again. No picture it all, and picture never comes up. Ive tried leaving it unplugged for a couple hours, wondering if there was some time-delay reset, but no such luck. Anyone have some ideas on what might be wrong, and if there's an easy fix? I'm hesitant to take it to a shop, but I should possibly do that. I'd rather just pop out the right fuse and be back in business. TIA, Dave |
#2
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~28" RCA TV - no picture, sound works
Whoops - I knew I forgot something:
Model: F27318 Chasis: CTC203AA5 Thanks again, Dave "Dave" wrote in message ... Hi All, I've got a ~28" RCA "Entertainment Series" TV. It's a little over 2 years old (just out of warranty, of course), and the picture is totally gone. Sound is working fine. A couple days ago, I noticed when I turned it on, I heard what I assume is some type of relay click (per normal), then a couple seconds later, it clicked off again, and the tube never lit. I tried it 2x more times, and the 2nd time it worked. I chalked it up to a quirk, but it left a bad feeling in my stomach. Tonight I went to turn it on, I heard the click, then it "clicked off" again. No picture it all, and picture never comes up. Ive tried leaving it unplugged for a couple hours, wondering if there was some time-delay reset, but no such luck. Anyone have some ideas on what might be wrong, and if there's an easy fix? I'm hesitant to take it to a shop, but I should possibly do that. I'd rather just pop out the right fuse and be back in business. TIA, Dave |
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~28" RCA TV - no picture, sound works
Remove L14401 in the base circuit of the horiz output. Clean all glue off
leads and solder pads, reinsert the coil and resolder it to the pads. Also check soldering aroung LOPT. "Dave" wrote in message ... Whoops - I knew I forgot something: Model: F27318 Chasis: CTC203AA5 Thanks again, Dave "Dave" wrote in message ... Hi All, I've got a ~28" RCA "Entertainment Series" TV. It's a little over 2 years old (just out of warranty, of course), and the picture is totally gone. Sound is working fine. A couple days ago, I noticed when I turned it on, I heard what I assume is some type of relay click (per normal), then a couple seconds later, it clicked off again, and the tube never lit. I tried it 2x more times, and the 2nd time it worked. I chalked it up to a quirk, but it left a bad feeling in my stomach. Tonight I went to turn it on, I heard the click, then it "clicked off" again. No picture it all, and picture never comes up. Ive tried leaving it unplugged for a couple hours, wondering if there was some time-delay reset, but no such luck. Anyone have some ideas on what might be wrong, and if there's an easy fix? I'm hesitant to take it to a shop, but I should possibly do that. I'd rather just pop out the right fuse and be back in business. TIA, Dave |
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~28" RCA TV - no picture, sound works
Thank you very much - I really appreciate you taking the time to respond.
I'm a bit new to the TV game (my background is in computing and some small electronics), could you possibly give me some pointers on locating these items? Thanks again, Dave "Art" wrote in message ... Remove L14401 in the base circuit of the horiz output. Clean all glue off leads and solder pads, reinsert the coil and resolder it to the pads. Also check soldering aroung LOPT. "Dave" wrote in message ... Whoops - I knew I forgot something: Model: F27318 Chasis: CTC203AA5 Thanks again, Dave "Dave" wrote in message ... Hi All, I've got a ~28" RCA "Entertainment Series" TV. It's a little over 2 years old (just out of warranty, of course), and the picture is totally gone. Sound is working fine. A couple days ago, I noticed when I turned it on, I heard what I assume is some type of relay click (per normal), then a couple seconds later, it clicked off again, and the tube never lit. I tried it 2x more times, and the 2nd time it worked. I chalked it up to a quirk, but it left a bad feeling in my stomach. Tonight I went to turn it on, I heard the click, then it "clicked off" again. No picture it all, and picture never comes up. Ive tried leaving it unplugged for a couple hours, wondering if there was some time-delay reset, but no such luck. Anyone have some ideas on what might be wrong, and if there's an easy fix? I'm hesitant to take it to a shop, but I should possibly do that. I'd rather just pop out the right fuse and be back in business. TIA, Dave |
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~28" RCA TV - no picture, sound works
I strongly urge you not to work on your set then. I've taken a
professional course(1 year) and extra electronics (also another year), and I have had plenty of minor shocks. Don't let your first shock be the last.... Isildur's Bane On Tue, 23 Mar 2004 19:00:55 GMT, "Dave" wrote: Thank you very much - I really appreciate you taking the time to respond. I'm a bit new to the TV game (my background is in computing and some small electronics), could you possibly give me some pointers on locating these items? Thanks again, Dave "Art" wrote in message ... Remove L14401 in the base circuit of the horiz output. Clean all glue off leads and solder pads, reinsert the coil and resolder it to the pads. Also check soldering aroung LOPT. "Dave" wrote in message ... Whoops - I knew I forgot something: Model: F27318 Chasis: CTC203AA5 Thanks again, Dave "Dave" wrote in message ... Hi All, I've got a ~28" RCA "Entertainment Series" TV. It's a little over 2 years old (just out of warranty, of course), and the picture is totally gone. Sound is working fine. A couple days ago, I noticed when I turned it on, I heard what I assume is some type of relay click (per normal), then a couple seconds later, it clicked off again, and the tube never lit. I tried it 2x more times, and the 2nd time it worked. I chalked it up to a quirk, but it left a bad feeling in my stomach. Tonight I went to turn it on, I heard the click, then it "clicked off" again. No picture it all, and picture never comes up. Ive tried leaving it unplugged for a couple hours, wondering if there was some time-delay reset, but no such luck. Anyone have some ideas on what might be wrong, and if there's an easy fix? I'm hesitant to take it to a shop, but I should possibly do that. I'd rather just pop out the right fuse and be back in business. TIA, Dave |
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~28" RCA TV - no picture, sound works
Thanks, I appreciate the concern.
I've left the tv unplugged since this morning for that very reason. Is it not wise to assume that ~12 hours will drain pretty much everything in a standard tv? Dave "Isildur's Bane" wrote in message ... I strongly urge you not to work on your set then. I've taken a professional course(1 year) and extra electronics (also another year), and I have had plenty of minor shocks. Don't let your first shock be the last.... Isildur's Bane On Tue, 23 Mar 2004 19:00:55 GMT, "Dave" wrote: Thank you very much - I really appreciate you taking the time to respond. I'm a bit new to the TV game (my background is in computing and some small electronics), could you possibly give me some pointers on locating these items? Thanks again, Dave "Art" wrote in message ... Remove L14401 in the base circuit of the horiz output. Clean all glue off leads and solder pads, reinsert the coil and resolder it to the pads. Also check soldering aroung LOPT. "Dave" wrote in message ... Whoops - I knew I forgot something: Model: F27318 Chasis: CTC203AA5 Thanks again, Dave "Dave" wrote in message ... Hi All, I've got a ~28" RCA "Entertainment Series" TV. It's a little over 2 years old (just out of warranty, of course), and the picture is totally gone. Sound is working fine. A couple days ago, I noticed when I turned it on, I heard what I assume is some type of relay click (per normal), then a couple seconds later, it clicked off again, and the tube never lit. I tried it 2x more times, and the 2nd time it worked. I chalked it up to a quirk, but it left a bad feeling in my stomach. Tonight I went to turn it on, I heard the click, then it "clicked off" again. No picture it all, and picture never comes up. Ive tried leaving it unplugged for a couple hours, wondering if there was some time-delay reset, but no such luck. Anyone have some ideas on what might be wrong, and if there's an easy fix? I'm hesitant to take it to a shop, but I should possibly do that. I'd rather just pop out the right fuse and be back in business. TIA, Dave |
#7
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~28" RCA TV - no picture, sound works
"Dave" wrote in message ... Hi All, I've got a ~28" RCA "Entertainment Series" TV. It's a little over 2 years old (just out of warranty, of course), and the picture is totally gone. Sound is working fine. A couple days ago, I noticed when I turned it on, I heard what I assume is some type of relay click (per normal), then a couple seconds later, it clicked off again, and the tube never lit. I tried it 2x more times, and the 2nd time it worked. I chalked it up to a quirk, but it left a bad feeling in my stomach. Tonight I went to turn it on, I heard the click, then it "clicked off" again. No picture it all, and picture never comes up. Ive tried leaving it unplugged for a couple hours, wondering if there was some time-delay reset, but no such luck. Anyone have some ideas on what might be wrong, and if there's an easy fix? I'm hesitant to take it to a shop, but I should possibly do that. I'd rather just pop out the right fuse and be back in business. TIA, Dave Probably just a bad solder joint, unless you can solder reasonably well don't even bother opening the thing up. |
#8
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~28" RCA TV - no picture, sound works
"Dave" wrote in message ... Thanks, I appreciate the concern. I've left the tv unplugged since this morning for that very reason. Is it not wise to assume that ~12 hours will drain pretty much everything in a standard tv? Dave Don't assume anything, yes it will all likely be discharged, but it's still best to treat everything as if it was live, don't be paranoid but don't be careless either. |
#9
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~28" RCA TV - no picture, sound works
I can solder reasonably well, that part doesn't bother me.
Would you go to the extent of using insulated tools? I haven't bothered to crack the case yet, but I assume I'm going to need a little direction on finding the parts I'll be working with .. or is it really worth going through *everything* checking solder connecetions? Dave "James Sweet" wrote in message news:7s48c.77484$1p.1092324@attbi_s54... "Dave" wrote in message ... Hi All, I've got a ~28" RCA "Entertainment Series" TV. It's a little over 2 years old (just out of warranty, of course), and the picture is totally gone. Sound is working fine. A couple days ago, I noticed when I turned it on, I heard what I assume is some type of relay click (per normal), then a couple seconds later, it clicked off again, and the tube never lit. I tried it 2x more times, and the 2nd time it worked. I chalked it up to a quirk, but it left a bad feeling in my stomach. Tonight I went to turn it on, I heard the click, then it "clicked off" again. No picture it all, and picture never comes up. Ive tried leaving it unplugged for a couple hours, wondering if there was some time-delay reset, but no such luck. Anyone have some ideas on what might be wrong, and if there's an easy fix? I'm hesitant to take it to a shop, but I should possibly do that. I'd rather just pop out the right fuse and be back in business. TIA, Dave Probably just a bad solder joint, unless you can solder reasonably well don't even bother opening the thing up. |
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~28" RCA TV - no picture, sound works
On Wed, 24 Mar 2004 00:00:39 GMT, "Dave" wrote:
Thanks, I appreciate the concern. I've left the tv unplugged since this morning for that very reason. Is it not wise to assume that ~12 hours will drain pretty much everything in a standard tv? Dave Dave, Don't remove the black suction cup with hot pink wire on the CRT itself. The L14401 is between base pin of horizontal (Q14401) transistor and the horizontal driver transformer (grey or black). The guys forgot to tell you to remove glue, they mean completely after removing the coil. This means stripping glue from the coil with finger nails and unclog one hole where coil lead goes through with piece of wire. To make things go easier, get wires out of plastic bow-tie holders, unplug the speaker wires also unplug input wires on the upright board. Remember how wires are put in this way and reinstall all wires in original places after the repair. Still need to unplug the two (vertical and horizontal plugs) plugs on the CRT yoke and gently get the wires out of CRT yoke wire holders. These white connectors is latched, Gently lift the "hoop" and work plug out of it's socket. I like these CTC203, good so far. Cheers, Wizard |
#11
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~28" RCA TV - no picture, sound works
Thanks, that was very helpful. I've got everything apart, and identified
the L14401. I seem to have forgotten my soldering iron at work, though, so I'll have to finish up tomorrow. However, all of the solder connections on the panel seem to be in good shape. I don't see any problems near any of the transformers either - everything looks solid. Hopefilly cleaning that glue off and resoldering L14401 will take care of it. Dave "Jason D." wrote in message ... On Wed, 24 Mar 2004 00:00:39 GMT, "Dave" wrote: Thanks, I appreciate the concern. I've left the tv unplugged since this morning for that very reason. Is it not wise to assume that ~12 hours will drain pretty much everything in a standard tv? Dave Dave, Don't remove the black suction cup with hot pink wire on the CRT itself. The L14401 is between base pin of horizontal (Q14401) transistor and the horizontal driver transformer (grey or black). The guys forgot to tell you to remove glue, they mean completely after removing the coil. This means stripping glue from the coil with finger nails and unclog one hole where coil lead goes through with piece of wire. To make things go easier, get wires out of plastic bow-tie holders, unplug the speaker wires also unplug input wires on the upright board. Remember how wires are put in this way and reinstall all wires in original places after the repair. Still need to unplug the two (vertical and horizontal plugs) plugs on the CRT yoke and gently get the wires out of CRT yoke wire holders. These white connectors is latched, Gently lift the "hoop" and work plug out of it's socket. I like these CTC203, good so far. Cheers, Wizard |
#12
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~28" RCA TV - no picture, sound works
Remove L14401 in the base circuit of the horiz output. Clean all glue off
leads and solder pads, reinsert the coil and resolder it to the pads. Also check soldering aroung LOPT. Yes, this should fix it. Very common on these "28 inchers" ;-) Ron |
#13
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~28" RCA TV - no picture, sound works
Ive got the coil off right now -- it's just the "hot glue" that they used to
fix it down that needs to be removed/cleaned? It's not actually that pink glue they use to hold the coil in, right? Also, silly question, how do you identify the LOPT? I see multiple transformers, the one closest to the coil is the horiz, I assume .. not sure which the lopt is though.. Thanks agian, Dave "RonKZ650" wrote in message ... Remove L14401 in the base circuit of the horiz output. Clean all glue off leads and solder pads, reinsert the coil and resolder it to the pads. Also check soldering aroung LOPT. Yes, this should fix it. Very common on these "28 inchers" ;-) Ron |
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~28" RCA TV - no picture, sound works
Woohoo! Got it working, thanks for all the help guys. I really do
appreciate the time you took. These things are great to work on, you'd swear they were designed just for repairing. (kinda scary that way But it was so dead simple that I couldn't believe it when it worked. I went through and cleaned up several other kind of messy solders while I had it open, not sure exactly what fixed it, but I'd guess it was the L14401. Thanks again, Dave "Dave" wrote in message ... Hi All, I've got a ~28" RCA "Entertainment Series" TV. It's a little over 2 years old (just out of warranty, of course), and the picture is totally gone. Sound is working fine. A couple days ago, I noticed when I turned it on, I heard what I assume is some type of relay click (per normal), then a couple seconds later, it clicked off again, and the tube never lit. I tried it 2x more times, and the 2nd time it worked. I chalked it up to a quirk, but it left a bad feeling in my stomach. Tonight I went to turn it on, I heard the click, then it "clicked off" again. No picture it all, and picture never comes up. Ive tried leaving it unplugged for a couple hours, wondering if there was some time-delay reset, but no such luck. Anyone have some ideas on what might be wrong, and if there's an easy fix? I'm hesitant to take it to a shop, but I should possibly do that. I'd rather just pop out the right fuse and be back in business. TIA, Dave |
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~28" RCA TV - no picture, sound works
Do everything as suggested EVEN when they look good.
kip -- However, all of the solder connections on the panel seem to be in good shape. I don't see any problems near any of the transformers either - everything looks solid. |
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~28" RCA TV - no picture, sound works
On Thu, 25 Mar 2004 01:56:25 GMT, "Dave" wrote:
Ive got the coil off right now -- it's just the "hot glue" that they used to fix it down that needs to be removed/cleaned? It's not actually that pink glue they use to hold the coil in, right? Also, silly question, how do you identify the LOPT? I see multiple transformers, the one closest to the coil is the horiz, I assume .. not sure which the lopt is though.. Line output transformer, "old timer name", the RCA name for it is IHVT (intergrated high voltage transformer) but we call those as FLYBACK transformer. This is round thing with ferrite core on the outside with one leg going into it with screen & focus (some models don't have the adjustments on it like in projectors) with three wires from it (high voltage to the suction cup on the tube), two goes to the CRT board. Reason it is called flyback transformer in part of horizontal scan, right after horizontal transistor turnoff, transformer's magnetic field collapses generating back emf voltage that cause beam (beam spot at right side) to fly back to left side. During flyback also generates back-emf charges up all caps and diode, coils network modulates and smoothes the motion of beam from left to appox mid way as this network discharges & oscillates. This is the point where horizontal transistor turns on just before that. It's very heavy in energy and any problems anywhere, the horizontal transistor blows. This is why this glue is one of many possible horizontal problems but this CTC203 is common with this glue. Pink glue? This would be the two small red hard lumps that secures coil winding to the ferrite rod, that is not the problem. The hot glue is pale off white (almost feels like wax) thing that held coil to the board. Clean those hot glue *completely* and unplug one tiny hole for one of wires for that coil. Cheers, Wizard Thanks agian, Dave "RonKZ650" wrote in message ... Remove L14401 in the base circuit of the horiz output. Clean all glue off leads and solder pads, reinsert the coil and resolder it to the pads. Also check soldering aroung LOPT. Yes, this should fix it. Very common on these "28 inchers" ;-) Ron |
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