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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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#1
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older sony RPTV problem
this is my first post here but hopefully someone can point me in the right
direction or help out. i just recently picked up a used sony KP53XBR200 53 inch rear projection tv. it's visibly in very good condition and i tested it on-site and it seemed to work without noticing any issues. we loaded as carefully as possible without slamming it around, etc, into one of those home depot rental trucks and stapped down very tightly for the 20 mile drive home.. not a very bumpy trip at all. i know these tvs are delicate so i did my best to be very careful. we got it home and fired it up... the red gun is way out of alignment.. probably about 2-3 inches off. I opened up the tv and nothing is visibly loose, etc. I cleaned out some cobwebs, cleaned the mirror, gun lenses and inside of the screen (filthy!) and buttoned it all back up. this tv has an 'auto focus' for convergence but no manual convergence i could find. when i run the auto convergence it moves the red signal closer to the center + but never converges it fully. the numerous times i've run it i've gotten the following error codes... E12R, E17R, and E13R after about 30 minutes of being left on last night on the red image seemed to have some horizontal jitter in it. almost like some electronic noise or interference and was wavering from 1-3 inches off convergence to the right. strangely when i turned the tv off.. then back on again.. the picture was clear as a bell with no convergence issues. i left it on overnight and when i woke up it was still fine after about 6-8 hours. I turned it off and went out for the day... came home about 4 hrs later and it's back to a convergence issue again. i kept cycling power with no change and then out of nowhere the image converged itself. an hour or so later.. while watching the TV the convergence went off without warning and cycling power didn't seem to have any effect. i'm assuming convergence on this isn't a matter of physical positioning of the guns but more a circuit board controlled thing. maybe the red board needs replacing? this is a longshot but does anyone have a service manual for this tv or an idea of what could be causing the issue and what it will cost to have fixed? also.. what should i look for when calling around for a service technician if this is not something I can fix myself (i do have some technical ability and not adverse to getting in there and swapping parts if possible.) thanks! keith. |
#2
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Likely just bad solder connections at the convergence IC's. Rono.
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#3
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i found this page
http://wa6ati.com/Sony-Projection.html and it's showing some similar issues with a covergence IC (IC506) being the culprit.. i'd assume this is possibly the one you're talking about. without a schematic, anyone know where i could locate this chip? not sure if it's on the crt yoke itself or somewhere else (on the mainboard?) thanks. k. "Rono" wrote in message ... Likely just bad solder connections at the convergence IC's. Rono. |
#4
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On Mon, 13 Jun 2005 00:23:44 -0400, "Keith in NJ"
wrote: i found this page http://wa6ati.com/Sony-Projection.html and it's showing some similar issues with a covergence IC (IC506) being the culprit.. i'd assume this is possibly the one you're talking about. without a schematic, anyone know where i could locate this chip? not sure if it's on the crt yoke itself or somewhere else (on the mainboard?) thanks. k. There should be two large ICs mounted on a big heat sink. The ICs probably have a number that starts with STK. They are a common problem with virtually all projection TVs. Andy Cuffe -- Use this address until 12/31/2005 -- Use this address after 12/31/2005 |
#5
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Keith in NJ wrote: this is my first post here but hopefully someone can point me in the right direction or help out. i just recently picked up a used sony KP53XBR200 53 inch rear projection tv. it's visibly in very good condition and i tested it on-site and it seemed to work without noticing any issues. we loaded as carefully as possible without slamming it around, etc, into one of those home depot rental trucks and stapped down very tightly for the 20 mile drive home.. not a very bumpy trip at all. i know these tvs are delicate so i did my best to be very careful. we got it home and fired it up... the red gun is way out of alignment.. probably about 2-3 inches off. I opened up the tv and nothing is visibly loose, etc. I cleaned out some cobwebs, cleaned the mirror, gun lenses and inside of the screen (filthy!) and buttoned it all back up. this tv has an 'auto focus' for convergence but no manual convergence i could find. when i run the auto convergence it moves the red signal closer to the center + but never converges it fully. the numerous times i've run it i've gotten the following error codes... E12R, E17R, and E13R after about 30 minutes of being left on last night on the red image seemed to have some horizontal jitter in it. almost like some electronic noise or interference and was wavering from 1-3 inches off convergence to the right. strangely when i turned the tv off.. then back on again.. the picture was clear as a bell with no convergence issues. i left it on overnight and when i woke up it was still fine after about 6-8 hours. I turned it off and went out for the day... came home about 4 hrs later and it's back to a convergence issue again. i kept cycling power with no change and then out of nowhere the image converged itself. an hour or so later.. while watching the TV the convergence went off without warning and cycling power didn't seem to have any effect. i'm assuming convergence on this isn't a matter of physical positioning of the guns but more a circuit board controlled thing. maybe the red board needs replacing? this is a longshot but does anyone have a service manual for this tv or an idea of what could be causing the issue and what it will cost to have fixed? also.. what should i look for when calling around for a service technician if this is not something I can fix myself (i do have some technical ability and not adverse to getting in there and swapping parts if possible.) thanks! keith. It is highly likely that one of the yokes on the red tube is loose, and moved during the trip. Just look on the back end of the red tube and see if there's anything loose, tighten the clamps again after aligning the picture. Good luck. |
#6
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yoke as in the yoke board on the back of the CRT?
i'll reach in there and see if it's loose. what is strange though is that moving the unit or tapping the body of the CRT has no effect on the picture which i would assume it would if it were loose. question... i mess around with arcade machines and monitors so i have a little experience with discharging monitors and staying clear of the annode cap and wire, etc... but on this monster... what exactly am I watching out for? i guess i could just trace the wires from the flyback and steer clear from there. also.. i located the 2 "stk" IC's on the heatsinks. they're held in with 2 screws so i'm assuming they're socketed unless that's what holds the heatsink to them. 1. where would I get replacements for these. 2. doesn't each gun have individual convergence circuitry? 3. where (if anywhere) can i find the service manual for this tv? thanks for all the help so far. i'm confident i'll get this fixed. k. |
#7
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i'm assuming this is the IC you're referring to is this one...
IC STK392-020 i just found a source for it.. is $32.38 each from partstore.com a good price / source for parts? i guess i should replace both of these ICs? is there any way to pinpoint an issue like this before simply swapping out parts until it's resolved? thanks. |
#8
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#9
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thanks ken. i'm a pretty common sense, check the basics and go by
process of elimintation first kind of guy. i have a couple of more physical things i want to check before I start swapping ICs and such. this morning before i left for work i took another look at the mainboard just to see what's socketed and what's not... i see a few boards in there I want to pull and reseat as well as some of the connections. before i can really see anything though, I'm going have to figure out a way to get 4-5 years worth of dust off the board without simply blowing it all over the place. maybe one of those little vacuums with the brushes. yeah.. before i order $70 worth of ICs i'm going to get in there and check the basics again. thanks. k. |
#10
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wrote in message ups.com... i'm assuming this is the IC you're referring to is this one... IC STK392-020 i just found a source for it.. is $32.38 each from partstore.com a good price / source for parts? i guess i should replace both of these ICs? is there any way to pinpoint an issue like this before simply swapping out parts until it's resolved? thanks. Try resoldering the IC before you go throwing parts at it. |
#11
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wrote in message ups.com... yoke as in the yoke board on the back of the CRT? i'll reach in there and see if it's loose. what is strange though is that moving the unit or tapping the body of the CRT has no effect on the picture which i would assume it would if it were loose. I think you mean the neck board, and no that's not the yoke, the yoke is the coil of wires on the neck. |
#12
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yeah. neck board.. sorry. i get the naming mixed up. coincidentally, i just
adjusted the convergence on my ms pac man machine last night.. what a pain.. i wish arcade monitors had a 'magic focus' button on them. lol. k. "James Sweet" wrote in message news:xVqre.10706$lb5.9659@trnddc04... wrote in message ups.com... yoke as in the yoke board on the back of the CRT? i'll reach in there and see if it's loose. what is strange though is that moving the unit or tapping the body of the CRT has no effect on the picture which i would assume it would if it were loose. I think you mean the neck board, and no that's not the yoke, the yoke is the coil of wires on the neck. |
#13
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#14
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by suffix i'm assuming your referring to the last 2 numbers on the
convergence ICs... IC STK392-020 in this case "20". another question is.. if there's 3 guns.... there's only 2 convergence ICs. actually.. i thought about this.. on a regular CRT.. green is the center and red an blue converge on that.. is rear projection similar? and if so... i'm assuming 1 IC controls red and the other controls blue. that being said.. is there any way to tell which is the RED convergence IC? or am i completely incorrect in my assumption. thx. keith |
#15
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so i visually checked everything out tonight. then with the tv on i lightly
tapped a couple of the heat sinks and the red crt neck board, etc and there was no visible change in the red convergence. i'm going to call around to a few places tomorrow to get estimates on repair... can anyone give me an idea what i might be looking at $$$ wise so i don't get ripped off. thanks. keith. "Keith in NJ" wrote in message ... this is my first post here but hopefully someone can point me in the right direction or help out. i just recently picked up a used sony KP53XBR200 53 inch rear projection tv. it's visibly in very good condition and i tested it on-site and it seemed to work without noticing any issues. we loaded as carefully as possible without slamming it around, etc, into one of those home depot rental trucks and stapped down very tightly for the 20 mile drive home.. not a very bumpy trip at all. i know these tvs are delicate so i did my best to be very careful. we got it home and fired it up... the red gun is way out of alignment.. probably about 2-3 inches off. I opened up the tv and nothing is visibly loose, etc. I cleaned out some cobwebs, cleaned the mirror, gun lenses and inside of the screen (filthy!) and buttoned it all back up. this tv has an 'auto focus' for convergence but no manual convergence i could find. when i run the auto convergence it moves the red signal closer to the center + but never converges it fully. the numerous times i've run it i've gotten the following error codes... E12R, E17R, and E13R after about 30 minutes of being left on last night on the red image seemed to have some horizontal jitter in it. almost like some electronic noise or interference and was wavering from 1-3 inches off convergence to the right. strangely when i turned the tv off.. then back on again.. the picture was clear as a bell with no convergence issues. i left it on overnight and when i woke up it was still fine after about 6-8 hours. I turned it off and went out for the day... came home about 4 hrs later and it's back to a convergence issue again. i kept cycling power with no change and then out of nowhere the image converged itself. an hour or so later.. while watching the TV the convergence went off without warning and cycling power didn't seem to have any effect. i'm assuming convergence on this isn't a matter of physical positioning of the guns but more a circuit board controlled thing. maybe the red board needs replacing? this is a longshot but does anyone have a service manual for this tv or an idea of what could be causing the issue and what it will cost to have fixed? also.. what should i look for when calling around for a service technician if this is not something I can fix myself (i do have some technical ability and not adverse to getting in there and swapping parts if possible.) thanks! keith. |
#16
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woohoo! success.
ordered 2 new convergence ICs thursday from east coast transistor... ($8.95 each on ebay) look like OEM (listed as sanyo) and after a LOT of sweating over the board laying on my stomach because i was afraid to pull the fat red flyback cable... (it seemed like it was soldered or something in there because i pulled HARD on it and it didn't budge). i managed to get the 2 chips desoldered off the board and the new chips back on... new heat sink compound and a pretty decent solder job if i don't say so myself. (first time i've done any PCB/IC work). put it all back together and BAM! (not literally) but BAM... perfect picture.. only maybe 1/8 inch out of convergence.. ran the auto focus and it was dead on! really excited since i only paid $300 for the tv and about $30 for the chips (with next day shipping). thanks everyone for the help! k. "Keith in NJ" wrote in message ... this is my first post here but hopefully someone can point me in the right direction or help out. i just recently picked up a used sony KP53XBR200 53 inch rear projection tv. it's visibly in very good condition and i tested it on-site and it seemed to work without noticing any issues. we loaded as carefully as possible without slamming it around, etc, into one of those home depot rental trucks and stapped down very tightly for the 20 mile drive home.. not a very bumpy trip at all. i know these tvs are delicate so i did my best to be very careful. we got it home and fired it up... the red gun is way out of alignment.. probably about 2-3 inches off. I opened up the tv and nothing is visibly loose, etc. I cleaned out some cobwebs, cleaned the mirror, gun lenses and inside of the screen (filthy!) and buttoned it all back up. this tv has an 'auto focus' for convergence but no manual convergence i could find. when i run the auto convergence it moves the red signal closer to the center + but never converges it fully. the numerous times i've run it i've gotten the following error codes... E12R, E17R, and E13R after about 30 minutes of being left on last night on the red image seemed to have some horizontal jitter in it. almost like some electronic noise or interference and was wavering from 1-3 inches off convergence to the right. strangely when i turned the tv off.. then back on again.. the picture was clear as a bell with no convergence issues. i left it on overnight and when i woke up it was still fine after about 6-8 hours. I turned it off and went out for the day... came home about 4 hrs later and it's back to a convergence issue again. i kept cycling power with no change and then out of nowhere the image converged itself. an hour or so later.. while watching the TV the convergence went off without warning and cycling power didn't seem to have any effect. i'm assuming convergence on this isn't a matter of physical positioning of the guns but more a circuit board controlled thing. maybe the red board needs replacing? this is a longshot but does anyone have a service manual for this tv or an idea of what could be causing the issue and what it will cost to have fixed? also.. what should i look for when calling around for a service technician if this is not something I can fix myself (i do have some technical ability and not adverse to getting in there and swapping parts if possible.) thanks! keith. |
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