Sony CRT TV not switching on

In Sonys of that vintage they has alot of problems wit the CRTs. Usually th e green for some reason. The gun gets weak and then shorts sometimes.

The AKB keeps the greyscale right until the green gun is too weak to do so. Then it is overdriven. This happens sometimes without notice.

The codes are not all that good. IF the main power supply is blown and it s ees no voltage at the supply to the audio IC and thinks it is shorted. Like some cars, you read the codes ad they do not tell the whole story. You hav e to look over all the codes it actually has. In the US they standardised i t, but not on TVs. But before that you had to interpret them by the model. And ironically if you got a code (even today) that says too lean alot of pe ople think fuel filter or dirty injectors, but it really needs an O2 (lambd a) sensor and is actually running too rich.

You actually could have a bad audio IC, you said it made a noise. But with the green on the screen with the (retrace) lines I suspect the CRT very gre atly. The audio IC has nothing to do with the color.

If you really like CRT TVs, find a Toshiba somewhere. If the CRT is good af ter all these years it will probably be good for quite some time. Actually if you find a Sony from the 1980s that still looks good it might last a whi le.

The picture tube in that thing is not the only part that isn't made anymore.

I'd guess at this point (10-12 years old) that everything in the parts list for it are marked NLA.

There's always a chance it's some nickle/dime part but taken under consideration no one makes CRT sets anymore, I just don't see the point.

Even though that might of been in Sony's top line, the WEGA's, I'm pretty confident that even one of those 32" no-name flat screens from Walmart they have for $99 on sale "will blow it away".

The only money I'd put into it is paying someone to haul it away.

-bruce snipped-for-privacy@ripco.com

I presume those are raster return lines, that would be blanked out if things were working normally. The electron beam goes from one side to the other illuminating the screen, but then it has to get back to the first side without adding unwanted light to the picture. I never did understand why the slope was more than two lines hight at the high end, however.

Hold the TV closer to your computer so I can figure that out.

Maybe.

When there is no picture, most of the people I dealt with assumed the problem was the picture tube, and it never was. Old bad picture tubes on black and white TVs have a silvery appearance, but I don't know how to describe the same problem on color tvs. But it's not what you've described.

And that's no longer simple. The trash pickup won't take it, and it now costs $25 per unit in my area to dispose of.

costs $25 per unit in my area to dispose of.

Around here, Best Buy takes everything - no cost. The Township takes electr onics four times per year, but one must be a township resident.

We have a very large Sony WEGA that followed us back from Saudi in 2005 (pu rchased in 2002), that has given us no trouble whatsoever. Interesting set, smart tuner, smart power-supply, almost nothing inside other than a (rathe r small) circuit board and the CRT, and a rather decent picture.

Peter Wieck Melrose Park, PA

the green for some reason. The gun gets weak and then shorts sometimes.

o. Then it is overdriven. This happens sometimes without notice.

Thanks but what is AKB?

sees no voltage at the supply to the audio IC and thinks it is shorted. Li ke some cars, you read the codes ad they do not tell the whole story. You h ave to look over all the codes it actually has. In the US they standardised it, but not on TVs. But before that you had to interpret them by the model . And ironically if you got a code (even today) that says too lean alot of people think fuel filter or dirty injectors, but it really needs an O2 (lam bda) sensor and is actually running too rich.

h the green on the screen with the (retrace) lines I suspect the CRT very g reatly. The audio IC has nothing to do with the color.

Maybe but that noise was due to picture disturbance. Yes, I think these cod es do not always give the correct indication of fault or these codes have g ot even more meaning which is not given in the code paper.

after all these years it will probably be good for quite some time. Actuall y if you find a Sony from the 1980s that still looks good it might last a w hile.

Is Toshiba still manufacturing CRT TV?

ture gone bad. Before this it never gave problem. Its picture started to gi ve disturbance, coloration problem, colour bleeding and also sometimes gave noise. So, I stopped using the TV but occasionally I switched it on to see its situation. I called a technician from Sony but he told that he does no t know that where the fault is and I?ll have to take it to service centre but I did not take it. One day I again switched it on but suddenly t he disturbance increased. So I got frightened and turned it off. When I aga in switched it on the TV started to operate normally. But another problem c ame up. Whenever I switched on the TV and before the picture came on the sc reen, the TV displayed a green colour glow and also green coloured horizont al lines on the screen appeared for about 2 seconds and then vanished. The lines were not completely perpendicular. The lines were somewhat slanting, raised from the right side. The picture

Yes, it seems raster line. I have heard about them but don't understand t hem well. It looked like some filament in picture tube is glowing in green colour.

it so. I could be wrong. Anyways, I used the TV for 1 - 2 months and then c losed and covered it as I was using another TV.

t the TV did not switch on. This was very much unexpected. Only the LED lig ht on the TV blinks 8 times in red. I searched to see that do these blinks indicate something. I found out that 8 blinks as in my case indicates probl em with audio IC IC406. But there was no audio problem in this TV. Only pic ture had issues.

nd the earlier picture problems?

eable.

s that component replaceable / repairable or not?

-Ronald

On Friday, July 15, 2016 at 11:14:21 PM UTC+5:30, snipped-for-privacy@gmail.com wrote :

ure gone bad. Before this it never gave problem. Its picture started to giv e disturbance, coloration problem, colour bleeding and also sometimes gave noise. So, I stopped using the TV but occasionally I switched it on to see its situation. I called a technician from Sony but he told that he does not know that where the fault is and I?ll have to take it to service c entre but I did not take it. One day I again switched it on but suddenly th e disturbance increased. So I got frightened and turned it off. When I agai n switched it on the TV started to operate normally. But another problem ca me up. Whenever I switched on the TV and before the picture came on the scr een, the TV displayed a green colour glow and also green coloured horizonta l lines on the screen appeared for about 2 seconds and then vanished. The l ines were not completely perpendicular. The lines were somewhat slanting, r aised from the right side. The picture itself was fine but maybe with somew hat reduced colour accuracy. I felt it so. I could be wrong. Anyways, I use d the TV for 1 - 2 months and then closed and covered it as I was using ano ther TV.

the TV did not switch on. This was very much unexpected. Only the LED ligh t on the TV blinks 8 times in red. I searched to see that do these blinks i ndicate something. I found out that 8 blinks as in my case indicates proble m with audio IC IC406. But there was no audio problem in this TV. Only pict ure had issues.

is responsible for TV not switching on and the earlier picture problems?

able. But If the fault does exist in some component of the picture tube the n is that component replaceable / repairable or not?

UPDATE: I called a technician who has earlier fixed my other Sony TV. I did not tell technician about the earlier problems and neither the tech asked about it. When the technician opened the TV, he tested components on the PC B using multi meter. The technician felt that it could be due to moisture. So he tried to remove moisture but this did not help. So, it was not due to moisture. Infact there was no moisture inside the TV. Then he told me that its IC called function IC has damaged but that one is unavailable. But the tech told that he will get it from somewhere. After few days the technicia n told me that he asked someone about the blinks and came to know that it w as due some other IC. Not the one he earlier told me. This means this techn ician who repairs TV never encountered this problem and could not correctly diagnose the fault. its strange. Anyways, he assured that he will come bac k after few days and will repair it. But he didn't turn up. I tried to cont act him but he even refused to communicate. Maybe he did not get the part o r he is unsure of the fault the TV has got.

The I asked at a TV repair shop. The person at the shop asked me that wheth er before the TV stopped working did it start giving green colour. I told h im - Yes, green coloured line during statup for 2-3 second just before pict ure appeared. He told me it seems that its Extra High Tension Transformer h as damaged. The transformer provides high voltage to the picture tube. To c onfirm, it took the TV to the shop. The person checked it using multi meter and confirmed that its EHT transformer has indeed damaged while the pictur e tube is fine. But even this transformer is no more available.

So, one technician told that its IC has damaged while another one told me i ts EHT transformer has damaged. Who is correct?

The symptoms - Disturbance in picture, later a fine picture but green glow and green raster line for 2-3 seconds during starup, then later on TV not s tarting up and blinking red light. These symtoms indicate an IC or Transfor mer failure? Please help.

These symtoms indicate an IC or Transformer failure? Please help.

With a new TV going for around $ 100 the best advice has already been given. Toss that old set out and buy a new one. If you can not repair it yourself,, the repair price will be more than a new one almost on labor alone even if they can get a part.

Not only that but a new LED TV will certainly use much less power than you old CRT unit. You should have changed it years ago and the electric savings on you electric bill would have already paid for it.

Automatic Kinescope Bias

You are getting f***ed. You probably have a bad CRT and damaged circuits due to that. Return the favor and make them pay to dispose of the unit. just quit answering when they call The television is worthless.

No, that's why he said good "after all these years". If the tv works now, and you turn it on and check, and provide a signal to see if the picture and sound work, it will probably work several more years, he says.

I don't know how you did this but you made your line look like it was Bruce's line.

Here it is with only 1 level of quoting, like it should be

When my friend called a service man for her stove, I think it was, and he said he couldn't get the part, he had taken out the part or she took it out herself, she got the maker and part number off it and bought it herself direct form whoever made it for the people who made the stove. It cost about $3. I'm sure if the stove man had gotten it, it would have been a bigger part with this part inside of it, and would have been 30 or 60 dollars.

Whole boards and ic's won't be available new but they might be on ebay.

That's true.

That's true too.

te:

cture gone bad. Before this it never gave problem. Its picture started to g ive disturbance, coloration problem, colour bleeding and also sometimes gav e noise. So, I stopped using the TV but occasionally I switched it on to se e its situation. I called a technician from Sony but he told that he does n ot know that where the fault is and I?ll have to take it to service centre but I did not take it. One day I again switched it on but suddenly the disturbance increased. So I got frightened and turned it off. When I ag ain switched it on the TV started to operate normally. But another problem came up. Whenever I switched on the TV and before the picture came on the s creen, the TV displayed a green colour glow and also green coloured horizon tal lines on the screen appeared for about 2 seconds and then vanished. The lines were not completely perpendicular. The lines were somewhat slanting, raised from the right side. The picture itself was fine but maybe with som ewhat reduced colour accuracy. I felt it so. I could be wrong. Anyways, I u sed the TV for 1 - 2 months and then closed and covered it as I was using a nother TV.

ut the TV did not switch on. This was very much unexpected. Only the LED li ght on the TV blinks 8 times in red. I searched to see that do these blinks indicate something. I found out that 8 blinks as in my case indicates prob lem with audio IC IC406. But there was no audio problem in this TV. Only pi cture had issues.

ch is responsible for TV not switching on and the earlier picture problems?

ceable. But If the fault does exist in some component of the picture tube t hen is that component replaceable / repairable or not?

id not tell technician about the earlier problems and neither the tech aske d about it. When the technician opened the TV, he tested components on the PCB using multi meter. The technician felt that it could be due to moisture . So he tried to remove moisture but this did not help. So, it was not due to moisture. Infact there was no moisture inside the TV. Then he told me th at its IC called function IC has damaged but that one is unavailable. But t he tech told that he will get it from somewhere. After few days the technic ian told me that he asked someone about the blinks and came to know that it was due some other IC. Not the one he earlier told me. This means this tec hnician who repairs TV never encountered this problem and could not correct ly diagnose the fault. its strange. Anyways, he assured that he will come b ack after few days and will repair it. But he didn't turn up. I tried to co ntact him but he even refused to communicate. Maybe he did not get the part or he is unsure of the fault the TV has got.

ther before the TV stopped working did it start giving green colour. I told him - Yes, green coloured line during statup for 2-3 second just before pi cture appeared. He told me it seems that its Extra High Tension Transformer has damaged. The transformer provides high voltage to the picture tube. To confirm, it took the TV to the shop. The person checked it using multi met er and confirmed that its EHT transformer has indeed damaged while the pict ure tube is fine. But even this transformer is no more available.

its EHT transformer has damaged. Who is correct?

w and green raster line for 2-3 seconds during starup, then later on TV not starting up and blinking red light. These symtoms indicate an IC or Transf ormer failure? Please help.

Not sure how or why the tech thought the EHT/Flyback would give a green pic ture before failing. I fixed thousands of those and never saw that happen.

Anyway, the smart money is on Jurb's guess. The CRT has some leakage and a rcing causing the AKB circuit to have some fits. Eventually, the IC on the CRT socket board shorted out (not uncommon) and taking out the supply from the main board. If you replace the IC and resistor (IIRC), the TV will ru n until the new IC gets whacked again. Sony had a bulletin that would impr ove the life of the IC by adding a diode across an inductor on the CRT sock et board, but that won't help a visually leaky CRT.

And while I agree that it's time to move on with regards to this particular Sony, anyone who thinks moving to a new TV will stop the bleeding is mista ken..

That's the easiest explanation to keep the conversation short.

In reality, in my opinion anyway, I really doubt most tv's after the early

I remember somewhere in that time frame ordering a schematic for a recent Zenith tv and just getting a 10 page "leaflet", with almost no information. It had block diagrams in gray and white shading. Basically if the fault was in one of the gray shaded areas, you replaced the whole module, not parts.

So even if you knew it was IC401 of the 201-778 module, you couldn't order just the IC401. Once the tv's that used that module were out of production, that pretty much spelled the end of repairing it.

The other thing I've seen is even if replacements are available, it's possible they ended up in a landfill somewhere. Mits here in the states used to be marketed as MGA, they pulled out of the North American region somewhere in the 80's (I think), all the parts in the depot in California for the national distribution got trashed.

Big tax write off. If they would of tried to auction or sell the stuff for one cent on the dollar, the tax write off was more profitable.

Odds are, most of the replacement parts for that tv you want to fix were not available the day after you bought it.

It sounds strange to say that but from the 1990's, it seems most sets were replaced with models that bore little internally to the earlier generation of them. Back in the 50's and 60's there were chassis that were in production for years. Some were used in tabletop models as well as consoles with little changes. Eventually they would come up with "new and improved" with a total redesign, but that took years usually.

Since the mid 90's it seems to me most chassis designs got tossed as soon as the new ones came out a year later. Yeah, of course there were parts that carried over from one to another, but for the most part they didn't. And again, even if you identified the bad part, it doesn't mean it was available as a replacement part.

So basically you are under the incorrect assumption that there was a stockpile of replacement parts where there was never one at all. Once that tv was out of production and the warranties expired, that about wraps it up.

You got 10-12 years out of it, consider yourself lucky and move on.

-bruce snipped-for-privacy@ripco.com

My shop was servicing crt sets to component level up until 2005 or so; and even a few since. Sony and Pioneer provided complete schematics and training materials for all of their crt-based sets to authorized service centers. So did Thomson. (GE and RCA - ugh)

And although we did not regularly service Toshiba, Hitachi, etc, we were able to get service data when we needed it.

Zenith did take the opposite view, and used mostly non-serviceable modules.

Mark Z.