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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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#41
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Zenith SR3587DT Sound OK, No Picture????
im not sure where these are located.
Is the pin coil on that seperate little board to the right? It didnt arc. yet. "David" wrote in message ... FYI you can disable a shutdown circuit as a last resort for troubleshooting when all standard procedures with the schematic fail but NEVER the XRAY protect, PERIOD. There are far too many other safe ways to troubleshoot a problem that triggers the xray protect. i.e. lowering the B+ voltage to the flyback circuit for one. BTW you still need to pull the shaping coil and pincushion coil on that set as those are very common failure items, as are electrolytic capacitors in the smps and the little filter one on the hv driver coil, as well as high failure of the flyback tripler causing an effective short (for 25kv) between the hv anode and ground, plus the tubes have been known to arc back to the yoke and blow a hole in the glass on these from flyback failure. David Mike wrote in message ... john, now that you told me off, and told him off, I see that YOUR NOT a technician, and you need to kiss my ass and bug off. "john" wrote in message .. . You are totally wrong William with your thinking a real Tech would never ever disable a shutdown circuit, maybe a non tech Guy would as per yourself. I have been in this buis for 36 yrs and have never even thought of disableing one to find a fault. Do it the right way........... kip Not say who is or is not, but sometimes you've got to disable a protection or shutdown circuit to fix a problem--even if the only result is burning up something. I'm not a tech, and I haven't had to do so very often, but sometimes it just takes a "plug 'er in and see what smokes" test to get to the bottom of something. William |
#42
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Zenith SR3587DT Sound OK, No Picture????
yea..... it's a real good price.... for the seller.
-- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "Mike" wrote in message ... I just looked up some information, Im just going to replace the whole board. they said it would cost 158 bucks for the board, Is this a good price? "Q.E.D." wrote in message ... Looking for input into whether this June 1996 build TV is worth having repaired. TV has worked great since purchase in 1996. Never got a great deal of use...maybe 10 hours a week on weekends to watch mainly movies on DVD or HBO. I figure less than 4000 hours total use. Set had been on for about 4 hours one day and the picture just went blank...like someone turned it off. No warning of trouble before that...no picture fade or blooming, it just went dark. Sound still works OK. The TV is long out of warranty but due to it's light use I was thinking it might be worth repairing. Can anyone give me an idea how much would be a fair rate for a repairman to come out and diagnose (I live in Philadelphia, PA)? What's an average repair cost on a 35" set? I realize the repair costs would be on top of the initial estimate depending on what is wrong. On that note, are my TV's symptoms indicative of a common problem? Based on my novice research I think it could be a high voltage problem. The neighborhood repair guy went out of business about three years ago. Choosing a repair service, I'm finding, is almost impossible to decide on blindly. Any advice would be appreciated. Thanks |
#43
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Zenith SR3587DT Sound OK, No Picture????
William R. Walsh:
Your comment about "plug 'er in and see what smokes" reminds me of a "technician" that once worked in my shop...... if he was troubleshooting a piece of equipment that was blowing fuses, instead of actually doing some real troubleshooting and component testing, etc.... he would install a much higher rated fuse to see what smoked. Unfortunately with that method, there are lots of (what were good) parts that get smoked too, which runs up the repair bill, parts and labor.... and then the customer is not happy with the final invoice amount and won't come back..... a lost customer for sure. The final straw that forced me to fire this "technician" was when he was working on a very nice, high end stereo receiver that he was "troubleshooting" ..... after he went home, I happened to glance a look at the unit on his bench.... he had installed 2 cut-off 1/4" bolts where two 8 amp fuses were supposed to go. After he was fired the next day, I finally got the unit going but tons of parts along with the pcb were fried, charred, and smoked..... I ate the extra repair expenses to keep the customer coming back. William....in my opinion this is NOT good service practice..... just like disabling speaker "protection" circuitry in amplifiers and disabling "shut-down" circuitry when troubleshooting televisions. I have had stuff come into my shop that had previous repair attempts by so called techs using these methods..... and they left the circuitry disabled and butchered the unit..... this could be a safety issue and a disaster if the subsequent shop does not catch the modifications and do the repair job correctly. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "William R. Walsh" m wrote in message news:HBcXa.55756$Ho3.8481@sccrnsc03... Hi! A Technician would never ever think of disableing the Shut Down circuit like you wish to do. Do it the correct way ..The right way. Not say who is or is not, but sometimes you've got to disable a protection or shutdown circuit to fix a problem--even if the only result is burning up something. I'm not a tech, and I haven't had to do so very often, but sometimes it just takes a "plug 'er in and see what smokes" test to get to the bottom of something. William |
#44
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Zenith SR3587DT Sound OK, No Picture????
Is the price too high or something? Could I get it cheaper if I ordered it
elseware instead of my local shop? "Sofie" wrote in message ... yea..... it's a real good price.... for the seller. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - "Mike" wrote in message ... I just looked up some information, Im just going to replace the whole board. they said it would cost 158 bucks for the board, Is this a good price? "Q.E.D." wrote in message ... Looking for input into whether this June 1996 build TV is worth having repaired. TV has worked great since purchase in 1996. Never got a great deal of use...maybe 10 hours a week on weekends to watch mainly movies on DVD or HBO. I figure less than 4000 hours total use. Set had been on for about 4 hours one day and the picture just went blank...like someone turned it off. No warning of trouble before that...no picture fade or blooming, it just went dark. Sound still works OK. The TV is long out of warranty but due to it's light use I was thinking it might be worth repairing. Can anyone give me an idea how much would be a fair rate for a repairman to come out and diagnose (I live in Philadelphia, PA)? What's an average repair cost on a 35" set? I realize the repair costs would be on top of the initial estimate depending on what is wrong. On that note, are my TV's symptoms indicative of a common problem? Based on my novice research I think it could be a high voltage problem. The neighborhood repair guy went out of business about three years ago. Choosing a repair service, I'm finding, is almost impossible to decide on blindly. Any advice would be appreciated. Thanks |
#45
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Zenith SR3587DT Sound OK, No Picture????
Mike:
Obviously buying a replacement board will SPOIL your flawless 100% record with your method of troubleshooting. .... and I am quoting you...... ........ "I have fixed every TV i ran into so far." Replacing entire circuit boards is almost never a cost effective option for the service shop business, particularly if the board costs $158..... but if it is for your own personal repair and you like your television and there are NO other problems, especially with the CRT performance and emissions...... ? .... you will have to make that decision. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - snipped: "Mike" wrote in different messages "so, thats how I troubleshoot things, and I dont have a schematic, nor feel like ordering one for any TV I do, and it works for me every time. I have fixed every TV i ran into so far." I just looked up some information, Im just going to replace the whole board. they said it would cost 158 bucks for the board, Is this a good price? |
#46
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Zenith SR3587DT Sound OK, No Picture????
well, I called up another shop in my area, and they said that the whole
board needs replaced. The CRT gave a damn good picture before it went. The picture tube didnt gass out, I know that, and I even tested the filiment, and it lights normally. "Sofie" wrote in message ... Mike: Obviously buying a replacement board will SPOIL your flawless 100% record with your method of troubleshooting. .... and I am quoting you...... ....... "I have fixed every TV i ran into so far." Replacing entire circuit boards is almost never a cost effective option for the service shop business, particularly if the board costs $158..... but if it is for your own personal repair and you like your television and there are NO other problems, especially with the CRT performance and emissions...... ? ... you will have to make that decision. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - snipped: "Mike" wrote in different messages "so, thats how I troubleshoot things, and I dont have a schematic, nor feel like ordering one for any TV I do, and it works for me every time. I have fixed every TV i ran into so far." I just looked up some information, Im just going to replace the whole board. they said it would cost 158 bucks for the board, Is this a good price? |
#47
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Zenith SR3587DT Sound OK, No Picture????
the local shop I called up, said thats what they do. They told me that they
never really work down to the compnent level in zeniths, and told me i would have to replaced the board anyway. Quote from foley at teh shop: "Well, you can change the flyback, and I have to warn you, you will end up replacing that whole board, Give me the zenith part number, and I can quote you a price. blah blah blah" so, hes fixed this type of set many times according to him. Ill say one thing, of course he can fix it, if its a known good tube, sure replaceing the board is going to fix the set, think about it. anyway, FYI: i only ran into about 8 TVs, as the other tech i work with dont work on direct view TVs. Hes the projection tech, but im not making much money, and the repair business is not getting much business at all, so im thinking about quitting and opening my own PC and electronics shop. the Zenith is mine. I got it from a friend. he said a surge hit one day, and knocked the horiz sweep out, which i dont believe him on that part, because it was just a bad solder on the yoke return cap. I resolder it, and the shaping coil or pin coil, or something among that magnitude died, causing the flyback failure. "Sofie" wrote in message ... Mike: Obviously buying a replacement board will SPOIL your flawless 100% record with your method of troubleshooting. .... and I am quoting you...... ....... "I have fixed every TV i ran into so far." Replacing entire circuit boards is almost never a cost effective option for the service shop business, particularly if the board costs $158..... but if it is for your own personal repair and you like your television and there are NO other problems, especially with the CRT performance and emissions...... ? ... you will have to make that decision. -- Best Regards, Daniel Sofie Electronics Supply & Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - snipped: "Mike" wrote in different messages "so, thats how I troubleshoot things, and I dont have a schematic, nor feel like ordering one for any TV I do, and it works for me every time. I have fixed every TV i ran into so far." I just looked up some information, Im just going to replace the whole board. they said it would cost 158 bucks for the board, Is this a good price? |
#48
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Zenith SR3587DT Sound OK, No Picture????
One last thing, its not the entire chassis i am replacing, it would be a
waste of time for that. its just one module, called the sweep/smps board. and if you think about it, technically, it will "fix" the set. it sure wont be broken. it will work. so technically, its fixed. thank you very much. "Q.E.D." wrote in message ... Looking for input into whether this June 1996 build TV is worth having repaired. TV has worked great since purchase in 1996. Never got a great deal of use...maybe 10 hours a week on weekends to watch mainly movies on DVD or HBO. I figure less than 4000 hours total use. Set had been on for about 4 hours one day and the picture just went blank...like someone turned it off. No warning of trouble before that...no picture fade or blooming, it just went dark. Sound still works OK. The TV is long out of warranty but due to it's light use I was thinking it might be worth repairing. Can anyone give me an idea how much would be a fair rate for a repairman to come out and diagnose (I live in Philadelphia, PA)? What's an average repair cost on a 35" set? I realize the repair costs would be on top of the initial estimate depending on what is wrong. On that note, are my TV's symptoms indicative of a common problem? Based on my novice research I think it could be a high voltage problem. The neighborhood repair guy went out of business about three years ago. Choosing a repair service, I'm finding, is almost impossible to decide on blindly. Any advice would be appreciated. Thanks |
#49
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Zenith SR3587DT Sound OK, No Picture????
Gee ! You crack me up..Really
kip -- "Watch the return E-Mail addy its false" "Mike" wrote in message ... One last thing, its not the entire chassis i am replacing, it would be a waste of time for that. its just one module, called the sweep/smps board. and if you think about it, technically, it will "fix" the set. it sure wont be broken. it will work. so technically, its fixed. thank you very much. "Q.E.D." wrote in message ... Looking for input into whether this June 1996 build TV is worth having repaired. TV has worked great since purchase in 1996. Never got a great deal of use...maybe 10 hours a week on weekends to watch mainly movies on DVD or HBO. I figure less than 4000 hours total use. Set had been on for about 4 hours one day and the picture just went blank...like someone turned it off. No warning of trouble before that...no picture fade or blooming, it just went dark. Sound still works OK. The TV is long out of warranty but due to it's light use I was thinking it might be worth repairing. Can anyone give me an idea how much would be a fair rate for a repairman to come out and diagnose (I live in Philadelphia, PA)? What's an average repair cost on a 35" set? I realize the repair costs would be on top of the initial estimate depending on what is wrong. On that note, are my TV's symptoms indicative of a common problem? Based on my novice research I think it could be a high voltage problem. The neighborhood repair guy went out of business about three years ago. Choosing a repair service, I'm finding, is almost impossible to decide on blindly. Any advice would be appreciated. Thanks |
#50
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Zenith SR3587DT Sound OK, No Picture????
i know.
"john" wrote in message .. . Gee ! You crack me up..Really kip -- "Watch the return E-Mail addy its false" "Mike" wrote in message ... One last thing, its not the entire chassis i am replacing, it would be a waste of time for that. its just one module, called the sweep/smps board. and if you think about it, technically, it will "fix" the set. it sure wont be broken. it will work. so technically, its fixed. thank you very much. "Q.E.D." wrote in message ... Looking for input into whether this June 1996 build TV is worth having repaired. TV has worked great since purchase in 1996. Never got a great deal of use...maybe 10 hours a week on weekends to watch mainly movies on DVD or HBO. I figure less than 4000 hours total use. Set had been on for about 4 hours one day and the picture just went blank...like someone turned it off. No warning of trouble before that...no picture fade or blooming, it just went dark. Sound still works OK. The TV is long out of warranty but due to it's light use I was thinking it might be worth repairing. Can anyone give me an idea how much would be a fair rate for a repairman to come out and diagnose (I live in Philadelphia, PA)? What's an average repair cost on a 35" set? I realize the repair costs would be on top of the initial estimate depending on what is wrong. On that note, are my TV's symptoms indicative of a common problem? Based on my novice research I think it could be a high voltage problem. The neighborhood repair guy went out of business about three years ago. Choosing a repair service, I'm finding, is almost impossible to decide on blindly. Any advice would be appreciated. Thanks |
#51
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Zenith SR3587DT Sound OK, No Picture????
On Mon, 04 Aug 2003 23:38:18 GMT, "Mike" wrote:
the local shop I called up, said thats what they do. They told me that they never really work down to the compnent level in zeniths, and told me i would have to replaced the board anyway. Quote from foley at teh shop: "Well, you can change the flyback, and I have to warn you, you will end up replacing that whole board, Give me the zenith part number, and I can quote you a price. blah blah blah" This is Zenith's warranty policy, and it flies in the face of common sense. They repair to component level for the smaller sets, forcing a shop to do a lot of work for little or nothing, while replacing for the larger sets, forcing the shops to work for...little or nothing, and have a lot of money tied up for months besides, from purchasing entire assemblies, including CRT's. I have seen Zenith's policies, and if you are not intimately familiar...you won't understand anyway. Mike...time to wake up. Tom |
#52
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Zenith SR3587DT Sound OK, No Picture????
and smell the coffee? lol. I dont drink it.
"Tom MacIntyre" wrote in message news On Mon, 04 Aug 2003 23:38:18 GMT, "Mike" wrote: the local shop I called up, said thats what they do. They told me that they never really work down to the compnent level in zeniths, and told me i would have to replaced the board anyway. Quote from foley at teh shop: "Well, you can change the flyback, and I have to warn you, you will end up replacing that whole board, Give me the zenith part number, and I can quote you a price. blah blah blah" This is Zenith's warranty policy, and it flies in the face of common sense. They repair to component level for the smaller sets, forcing a shop to do a lot of work for little or nothing, while replacing for the larger sets, forcing the shops to work for...little or nothing, and have a lot of money tied up for months besides, from purchasing entire assemblies, including CRT's. I have seen Zenith's policies, and if you are not intimately familiar...you won't understand anyway. Mike...time to wake up. Tom |
#53
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Zenith SR3587DT Sound OK, No Picture????
In article , Mike
writes I just looked up some information, Im just going to replace the whole board. Are you sure you're competent? Could you learn to snip your quotes when posting? And stop top-posting? -- A. Top posters. Q. What's the most annoying thing on Usenet? |
#54
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Zenith SR3587DT Sound OK, No Picture????
In article , Mike
writes im thinking about quitting and opening my own PC and electronics shop. God help your customers. With the level of clue you have demonstrated to date, you'll go out of business very quickly. -- A. Top posters. Q. What's the most annoying thing on Usenet? |
#55
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Zenith SR3587DT Sound OK, No Picture????
On Mon, 4 Aug 2003 14:21:36 -0700, "Sofie" wrote:
Mike: Obviously buying a replacement board will SPOIL your flawless 100% record with your method of troubleshooting. .... and I am quoting you...... ....... "I have fixed every TV i ran into so far." Replacing entire circuit boards is almost never a cost effective option for the service shop business, particularly if the board costs $158..... but if it is for your own personal repair and you like your television and there are NO other problems, especially with the CRT performance and emissions...... ? ... you will have to make that decision. -- Best Regards, Daniel Sofie True, I have to replace a whole board on occasion and luckily the owner footed the cost, set was hacked by idiot "tech" or was covered under warrenty. Related to this topic: I once quoted for my tv project an whole AV-20D303 chassis. GLUPS, 400! This is an power efficient chassis that should consume less than 80W on 20" this chassis is also used in AV-27D303 which only consumes 105W using RCA 27" CRT. The RCA CTC203 based 27" is about 130W or so. Most of power losses comes from linear regulators (any) or older SMPSes. Looks like I would have to design in an switching SMPS in place of STR30134 regulator on an AV-20200. Cheers, Wizard |
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