first off I want to thank the contributors to this site you people do a great job. I have been reading through here and you definitly know your stuff.
I was just given this T.V. and am trying to figure it out it has a convergence problem. when I go to the convergence page I cannot get the red or the blue to line up with the white the red is close but the blue is way off. Both of them move but not far enough to line up. The fellow that gave me the T.V. said it worked great but when they moved it to the basement it never worked right again he didn't say if it was bumped or not there is no damage to the case in any way to make me think that it was. It also does one other thing and I don't know if they are related or not When I turned it on this morning the picture was shrinking and expanding for a bit and kind of fading to white and back to color. I was messing with the factory settings but when I got out of program I clicked cancel and abort changes because I couldn't get it in there either.
are these two problems related and can they be fixed relatively easy?
Also where can I get a sevice manual.
thank you for any and all help.
I was going to put a picture on here of the convergence screen but not sure how to do that.
alright, a little more info on this I pulled the convergence board out and nothing looked amiss until looked at the solder joints on the ic #stk392-110 on one of them there are three pins that look like the solder joint is seperated/cracked all the way around could this be it?
thanks
ben
replace Both STK392-110 IC with STK392-120 REPLACE them Just don't resolder them or you will regret it later on & check all 12 of the 6.8ohm resistors they will read around 3.4 ohms in circuit
the 2 black round items to the far right are the 2amp fuses
thanks dwray, I called a repair tech yesterday about it and he said the same thing that the chips are probably bad and resoldering them may cause more damage, he came out and checked them and found a bad fuse also so we are changing both chips, the fuse, and the fluid in the blue crt. He is doing that for right around two hundred dollars. Is that a fair price? Hopefully that will make it like new.
Thanks
Ben
here is the manual:
http://www.mediafire.com/?9m9nmjzjmd0
thanks alnp, I was looking for a manual, I found one on completeservicemanuals.com but can't down load because I have dialup so I will check this one out.
thanks
I'll try to get it added to the resources list here, you should be able to get it from on or the other with a steady dialup.
YES $200 is a fair Price JUST make sure HE puts IN ORIGINAL SANYO STK'S and NOT Cheap China Made STK'S And make sure he cleans all the bad fluid out of the Blue tube with warm water and then install new fluid & you might want to have this IC replaced its a very common IC to Fail on those sets IC is CNW136 and only cost about $6
alnp, I am not sure if I would be able to download it or not we live way out and the best connection we can get on a good day is 26.4k and that is not always steady. but I can give it a shot.
I stopped over at the fellows shop yesterday and he had the chips installed he put 110's back in. I asked him about it because it sounded like the 120's were better, he said that the board that was in this tv would not handle the 120 because the resisters were not heavy enough and would burn out and then wipe out the chips again. I guess I believe him because when he came over to look at the board one of the first things he said was we will put in a larger chip like a 120. Also he say's the fluid cannot be changed without removing the tube said you cannot get it clean enough so I am assumming that he is going to clean it well. I will mention the chip that you pointed out and see what he says about it, he may have one.
thanks again for all the help.
Ben
replacing the 110 with 120 want burn out anything the 120 will just last longer then the 110 will Every set we fix that has 110 gets 120 installed we have sets thats been over 7-8 years now and still running perfect Sounds like he only had 110 on hand and don't want to order the 120 The 110 will work OK JUST MAKE 100% sure there Original Sanyo and not China made after markets or in about 6months to year you will be replacing them again ! and yes the Tube will have to be removed and the lens removed to get the old fluid out and clean it the correct way .
Lot shops use China made because there only about $5 The Originals run $15-$18 and know the china made ones will last 30-60 days so there warrantty period will Be Over when they Do burn out in 6-12 months
he used the 110's and they were original, I told him about the opt chip and he really didn't want to hear it he said that when that chip goes out the set won't even come on I tried to show him the magnavox site said the same thing but by this time I think he was tired of hearing about you guys, I think I may have wore him out talking about you. Anyway he got the chips changed and I wanted him to check it out before he changed the fluid to make sure that it worked and we did well the screen was shrinking and expanding. I told him again about the opti. chip and he still didn't want to hear that. He did me really well on the price though he only charged me eighty dollars for the service call and the chip install and said the tv was probably no good because I told him that I had been in to the factory settings (062597) he said you can never get that back right once it has been changed. I dare to differ I played with it and it took me a while granted but it is back and looking pretty good I must say. I would like if someone can take a picture of the green pattern on the factory convergence screen so I can compare it to mine to see if I have it close. I don't know if all the lines are to be parallel or if they should have a bit of a curve on the top and bottom I would appreciate that.
Thanks for all the help.
Ben
Change the OPT IC thats what causes the Picture to shrink and expand it will blow the STK again if you don't change that chip the power supply Runs at 130V when that OPT IC starts to go bad it causes the power supply Voltage to vary from 80V to as high as 150V or more thats most likely what damged the other STK's
that board i have pictured showing you the OPT IC see the Burn spot on it and the Burned part on the left that was caused by the OPT IC sending the Supply Voltage REG. B+ over 200V The customer just keep tring to watch the TV when the Picture started shrinking and expanding and waited to long before having it Repaired
acme-sales.net has the CNW136 for $2.69 +sh
You shouldn't went into the service menu and messed with any settings until you had checked the power supply voltage was running at 130v because if its low or high because the OPT ic is going bad which it is because your picture did shrink & expand then when you change the IC and get the REG. B+ Voltage back to a stable 130V you might have to put the setting back
alright I will get that on order, The picture looks good it is just when you first turn it on that it does the shrinking. Also I needed to know that the set was good because we couldn't get a picture at all the way it was the convergence was so far out and couldn't be brought in on the regular customer screen, so that is why I messed with it. I don't mind doing it again it doesn't take that long and my wife is good at finding things that I miss in fact I would say that is one of her specialties is pointing out where my problems are. Hey thank you guys for your help I will let you know how it goes.
Ben
dwray, I have messed up a couple of times on this project. one I adjusted the service menu for convergence before I changed those chips trying to get it in. Then I called a tv tech without trying to do the job myself that cost me a little bit although he was very fair and I am happy with the job but I could have done it myself after I seen what he did. then last I have changed the settings without changing the cnw136 chip, but all of this I think I can correct over time I am going to change that chip first. But because I have changed the service convergence I would like to have a picture of the green screen with the factory settings, before I start adjusting it again if anyone has one or can take one so I can have something to go by. I am not sure if the lines should all be parallel or if the outside lines should have a little arch to them.
thanks
ben
Oh yeah the tech that was out here said there is no way (he will guarantee that the cnw136 chip is not causing the shrinking problem that when that chip goes out the whole tv goes dead. I tend to believe you guys on this one you have been right one hundred percent on this problem so I am going to change it.
oh yeah I forgot also he did not put any more heat sink on the 110 chips can you tell me if this is going to hurt those chips I say they don't have enough on them. Also since heat is the killer on these tv's and he went back with the 110 chip can I or would it help to get an old computer fan and mount behind there some where to help draw the heat off?
I have repaired 100'S of Phillips Big Screen TV that the Picture Shrinks and Expands and the OPT IC is the Cause Yes if the IC completely Go's bad the set will not power up because the 130V will be to low for the circuit to power up But you will get the Green power LED But no Picture Your OPT ic is not completely bad its starting to go bad that why at power up the picture Shrinks and expands Because the 130V is unstable and thats when the damage to the stk's will happen Do you have a GOOD Digital Volt Meter ?
here is were you can check the Power Supply Reg. B+ 130V
I measured the voltage where you said to and it was not close to what you said it was dead on I should have never doubted you guys I have a cnw136 on order right now from acme. Do they sell good quality parts I was going to order new stk's 120's since the ones that he put in were 110's and from china.
thanks
ben
Yes acme sells good parts and there STK'S are Originals I buy from them and never had any problems with there Parts and yes if he did use China made STK'S then yes you should replace them with original Sanyo STK'S
One Easy was to tell Originals from Generic (China) STK'S use some acetone or brakes part cleaner and wipe over the lettering on the Chips if the white lettering STK392-110 wipes off its CHINA MADE because they use paint the Originals are laser etched and want wipe off and if you look at the Picture of the 2 Stk's i posted above you see the lettering on the China made is not straight with the mounting holes , the original the lettering is straight with the Holes.
about the Fan if you replace the 110 with 120 you be OK and yes use Heat sink compound on the IC'S Just coat the back metal part of the STK'S Don't need 1/8' thick only about .010 is all you need
Forgot to add make sure to use Rosin core Solder
I placed the order already, I was going to get the 120's but decided if the 110's last a year then I am good with that and I will replace them then if the tv is still alive. If the 110's burn out again they won't hurt anything right it will just cause the same problem? The heat sink thing kind of bugs me though so maybe I will change my mind on that. right now I am waiting on the cnw136 so I can make sure that is going to fix the shrinking problem before I spend more money
btw if I haven't said it thank all y'all for the help you guys have been great and I would have been lost without you.
Just double check the fuse he replaced make sure its 2 amp and not something like 5 amp you should be ok if ic's do short again it Open the 2amp fuse again
I just wanted to say thank you to
Dwray
and
alnp
for all you help!!!!
I just installed the cnw136 yesterday and it was a success, I am now the owner of a 55" tv that works great. Not a bad deal for around a $120 dollars and would have been a lot cheaper if I would have listened to you guys and done what you said to repair it but I thought I would call a repairman since I don't have any experience on these things. But in any case I just wanted to thank you and tell you what a great job that you do.
Ben
The only thing I have left to do to have it perfect is get the color and focus right and also try to find out what the service convergence lines are supposed to look like exactly.
Thanks for everything
Ben
Way to go, Ben.
Hopefully you did get out of service menu convergence without making any changes before you replaced the ic's.
Have you cleaned the crt lens tops? Sprayway brand glass cleaner (no ammonia, Ace Hardware or WalMart) with a microfiber cloth works good.
The manual should have the convergence info, and focusing info. Read up on how to focus by rotating the lenses and using the focus block.
While you are cleaning the lens you should look into the blue and green for contaminated coolant.
thanks alnp,
The Green looked good and the blue we replaced, I was suprised at how easy the crt is to remove. all the lenses are clean the mirror is clean and the tv looks really good. I have not gotten a manual yet I couldn't talk myself into buying anything extra for it without knowing that it could be fixed. Now I am going to have to get one. As far as the lens I just used a old t-shirt and windex I sprayed the shirt and wiped the lens it worked great.
thanks
ben
No windex (has ammonia) or old t-shirt on those lenses, you will ruin them with scratches.
The manual link I posted earlier is a free download.
I will try it again I clicked on it the first time and didn't have any luck. I will give it another shot.
it is too late with the windex I already done it and used the t-shirt it seemed to work really well and the picture. I turned the tv on and looked at the lenses and they didn't looked scratched at all. hopefully I didn't hurt it too bad.
ben
I downloaded the service manual last night I want to thank you alnp for that link it went really well. I am going to take some time to read through it before I do anything else to the tv. Right now it is working good and the kids are loving it.
Thank you very much.
I have another question for you guys if you have time. I was driving home tonight and seen a big screen that someone was throwing out and me being the curious one just couldn't let it go so I stopped and talked to the fellow about it and it turns out that the tv works great but takes a long time to come on sometimes up to 20 minutes but once it comes on it does fine. So I brought home the lovely piece hoping to save it from the scrap yard if not I am out nothing and maybe learn something in the process. it is a hitachi 55ex1k I have looked and am going to keep looking for a service manual but in the mean time is this something that you have come across or maybe have a clue where to start?
thanks and if it is too much bother then that is alright I appreciate it just the same.
Ben
9p6444 Green Light No Picture, Same Thing? Opto IC Bad? I asked the couple that donated the set if it was expanding they said no. I bet it's the opto.