Sony FD Trinitron WEGA KV-SW29M50 29" TV Logo

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Anonymous Posted on Sep 23, 2013

Sony tv model kv-sz29n50 IS DARK PICTURE BUT SOUND IS OK, NOTHING ANY CHANGES ADJUST THE SCREEN AND FOCUS ON THE L.O.T...

5 Related Answers

Bill Heronemus

  • 308 Answers
  • Posted on Dec 24, 2006

SOURCE: sony tv picture keeps flashing

You likely have bad solder connections around the tuner area. This model has a history of problems in that area or the tuner itself.

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Anonymous

  • 18 Answers
  • Posted on Aug 16, 2007

SOURCE: Sony MODEL KV-2585 TV

You have your information incorrect, Q is not the designation for diodes, Q657 would be a transistor. First give us the correct number for the diode and how do you know it is shorted?

Anonymous

  • 10594 Answers
  • Posted on Oct 22, 2008

SOURCE: sony tv model kv-sz29n50 trinitron

Please confirm do you see this kind of picture in TV?
Mention exact model number to help you.

7a33dec.jpg

cactus bob

BOB BROWER

  • 267 Answers
  • Posted on Jun 21, 2009

SOURCE: Sony KV-32s40 (picture flashes in and out)

YOUR CRT (PICTURE TUBE ) IS GOING BAD . this is the most common way a sony tv crt fails . the tv is to old to make it worth a crt . but if your handy and carefull there is a way to get a little more time out of it . start with the tv cold , remove the back and look on the little board connected to the neck of the crt . there is a control marked "SCREEN " plug in the tv and cable and start it , with it flashing adjust that control , one way will make it flash more and one way less , adjust this no more than you need to , just enough to stop the flashing .NO MORE ! just be carefull the voltages in a tv can KILL . dont touch anything else in there and use a little inslated screwdriver to make the adjustment good luck .... if this answer helped please leave me 4 stars rateing , this high rateing will keep me in the paid answer department , thank you

gopakumarg43

The Knight

  • 76851 Answers
  • Posted on Nov 27, 2010

SOURCE: No Display, no sound- not working, showing dead.

Hello
Check the input fuse first. If it is blown, there will be some short inside the power regulator circuit. Usually Sony sets uses STR regulated power supply. You can see this STR, and Ic, screwed onto a heatsink. Replace it with a same type and number. Before replacing the STR, check the diodes used in that section for damage, mainlu zener diodes. They might get shorted along the blowing of the STR. Check that section throughly before resoldering the new STR.
If any further assistance you needs, get me through Fixya. Ok.

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Sony tv model kv-sz29n50 is dark picture but sound is ok, nothing any changes adjust the screen and focus on the L.O.T...

Video output card fault.
If you wish to get some details; visit the site linked here. Pull up older posts.
https://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.
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Screen goes black

Your TV have sound? If your TV have sound but no picture the problem is in the high voltage section of the crt board or try to adjust the screen adjustment.Its located in the flyback inside the TV at the back right side,the lower adjustment is the screen and upper is focus adjustment. If totaly your TV has black out check the fuse at the back if busted then replace it with same value.
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Kv-35xbr48 turns on fine nice picture then horizontal lines form distorting picture like interference also is the back hard to take off and put on needs a good vacum thanks for any suggestion

At first the picture is ok, and then distorted with horizontal lines i thinks. If the horzontal lines are parellel acros the screen, with an inch apart across the whole screen, your tv needs screen adjustments. Screen voltage may be high. look into the crt base also. Change it first. These also not resolve the problem, LOT may be faulty, with respect to screen focus pack. May need replacement. Try first setting screen voltage to a lower settings and observe.
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No picture, sound works on Sony TV KV-27V22.

try to adjust the screen. it is located behind the CRT board.(CRT board is the board that attached to the picture tube) you will find a black knob which label screen adjust it by turning the knob.
1helpful
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Sony Trinitron kv-27HFR blurry

the picture tube is gone.
i repaired 150 sony xbr and kv series with that problem.sony has a single gun not three and has a great pix,but burn out faster.
there is a main screen control that you can adjust ,but the tube is gone.
on the back of the crt there is 3 gun drives r g b .
turn the color all the way down so it is black and white.
if there is a green ore purple tint,one gun is out of balance.
ajdusting the r g b controls so that black and white is normal is what you want to do.
the crt board has the screen bias voltage 800volts on it so be very careful and use an insulated screwdriver to adjust the drive controls.
9helpful
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Sony tv model kv-sz29n50 trinitron

Please confirm do you see this kind of picture in TV?
Mention exact model number to help you.

7a33dec.jpg
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Sony trinitron TV KV-27TS27 screen remains dark

how do i adjust the brightness if i dont have the controler?
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Sony trinitron tv kv type

The screen voltage adjustment should be on the back of the high voltage multiplier. It should be marked as "Screen", or "G2". Next to it, is the "Focus" adjustment.

Some models of Sony sets have two focus adjustments. This is for H and V focus.

When increasing the screen voltage will usually increase the wear factor of the electron-gun assembly in the CRT. This is because it is increasing the screen bias current.

When increasing the screen bias, the brightness will increase a little. When the CRT is weak, this may produce visible retrace lines more so than on a good working CRT. This is because the excessive screen current will stop allowing the electron-gun assembly to work at its proper cut-off level in order to allow the blanking drive to bias it off during the retrace period.

Increasing the screen bias will usually cause a shift in the colour temperature especially in the low level gray colours. This is because the AKG reference for the electron-gun biases will be offset due to the differences in the electron gun performance characteristics change.


Jerry G.



0helpful
2answers

Sharp 20f640 focus problems

At the rear of the tv there may be two controls on the right hand side marked "screen" and "focus".If the set is newer,you will have to remove the cover and look to your right.You will see a dark object with a black or red wire coming out of it's top.That is your flyback transformer.On this you will find these two controls.Adjust your focus with the one so marked.Be careful to only adjust this control while you watch your picture clear.PROMPLY put the cover back.
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