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  #1  
Old 10-15-2017, 11:00 AM
lucvic lucvic is offline
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Sony kv1300e european 1972 color tv

Hi dear all,
I have this set with issues on power supply.
There are some diodes part number unknown by me.
One is sk1w50, has someone infos on it?

Many thanks
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  #2  
Old 10-15-2017, 11:47 AM
lucvic lucvic is offline
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Here in attach schema
Attached Images
File Type: jpg Screenshot_2017-10-15-16-53-46.jpg (89.0 KB, 33 views)
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  #3  
Old 10-15-2017, 07:40 PM
zeno zeno is offline
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Zener diode 51 volt 1 watt

73 Zeno
LFOD !
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  #4  
Old 10-16-2017, 05:48 AM
lucvic lucvic is offline
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Many thanks

Dear zeno if i will need some further infos I will write to you if you agree
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  #5  
Old 10-16-2017, 10:29 AM
zeno zeno is offline
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use this link to look up semi's
http://www.nteinc.com/semiconductors.php?a=12

I think what you are working on is in the US a PVM monitor.
Yours may be close to a PVM1200, that may help you.
There are many on this list with experience with them.
Good Luck

73 Zeno
LFOD !
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  #6  
Old 10-16-2017, 11:33 AM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by zeno View Post
use this link to look up semi's
http://www.nteinc.com/semiconductors.php?a=12

I think what you are working on is in the US a PVM monitor.
Yours may be close to a PVM1200, that may help you.
There are many on this list with experience with them.
Good Luck

73 Zeno
LFOD !
I thought the model number looked like the PAL version of the KV1200 series.
We had to use the 12" screen size because of our laws, but the rest of the world didn't!
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  #7  
Old 10-16-2017, 05:45 PM
lucvic lucvic is offline
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I.m writing from Italy, so forgive me for my poor english
tomorrow I will post a pic of my set
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  #8  
Old 10-17-2017, 03:13 AM
lucvic lucvic is offline
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Here it is
Attached Images
File Type: jpg P_20171017_194915_HDR.jpg (79.5 KB, 29 views)
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  #9  
Old 10-17-2017, 08:06 AM
zeno zeno is offline
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Yup dieseljeep correct. I was going by the power supply.
I dont remember that one !
BTW your English is very good !

Ciao
Zeno
LFOD !
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  #10  
Old 10-17-2017, 11:07 AM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by lucvic View Post
Here it is
It looks identical to the KV1212 I had.
Never had a problem with the power supply, but it had bad 'lytics in the PC corrector, where it was distorting the picture on the right. The vertical lines in the picture were curving to the right.
I sold it when the CRT was showing it's age.
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  #11  
Old 10-17-2017, 03:21 PM
lucvic lucvic is offline
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In my set circuit breaker S902 trips (opens) immediately
But i had no time to check components, right now I.m only in studying
Service manual and schematics.
I will let you know news as soon i will have
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  #12  
Old 10-18-2017, 11:07 AM
lucvic lucvic is offline
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Hi dear all,
Power supply is a buck converter not insulated.
I.m not so familiar with circuit of kick start circuit used in this set
In particular functions of part with d603 C603 d602 and q601
Can you help me in understanding?
Thanks
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  #13  
Old 10-19-2017, 07:23 AM
zeno zeno is offline
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Does this set use an SCR for horz output ?
Or separate HV & sweep outputs ?
Or just one transistor ?
If SCR usually it shorts & blows the power supply. VERY
hard to fix, either bad drive or load in the HV. If you
dont find everything thats bad will blow again.

Cant help with circuit, schematic too blurry.

73 Zeno
LFOD !
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  #14  
Old 10-19-2017, 09:32 AM
lucvic lucvic is offline
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Dear zeno,
If you agree i will send you a private message with my
Email address
Let me know
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  #15  
Old 10-19-2017, 11:16 AM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by zeno View Post
Does this set use an SCR for horz output ?
Or separate HV & sweep outputs ?
Or just one transistor ?
If SCR usually it shorts & blows the power supply. VERY
hard to fix, either bad drive or load in the HV. If you
dont find everything thats bad will blow again.

Cant help with circuit, schematic too blurry.

73 Zeno
LFOD !
The KV1212 uses the 2SC267 transistors in the HV sweep circuits.
The circuit is a little tricky and it used selected components. You generally had to use genuine Sony replacements which were hard to get, even years ago. They generally failed when the horiz driver transformer connections needed resoldering.
They also used those transistors in the power supply.
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