Question about Toshiba Standard (CRT) Televisions

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Toshiba model CF30E50, have problem with picture shrinking on the horizontal. problem comes and goes but getting worse.

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6 Suggested Answers

  • 556 Answers

SOURCE: Toshiba 3387DB Television

it is due to 60Hz HUM IN POWER SUPPLY. please check for input supply. also check for mains filter capacitor in tv. also check for one diode open in rectifier ckt.

Posted on Oct 06, 2007

  • 1694 Answers

SOURCE: Toshiba CF30E50 TV shuts off

Best first step is: Good visual inspection = look for hot spots
on PCB, check caps in those areas + solder any/all bad connections,esp. low voltage regulator pins.Look the whole
board over with magnifier = solder,solder,solder...T.

Posted on Oct 25, 2007

  • 20 Answers

SOURCE: Toshiba CF30E50 TV shuts off

You power supply coil is bad (transformer) prolonged run time causes to heat material as a result of expansion loss of contact no conductivity red light no power

Posted on Oct 25, 2007

wyoed1
  • 211 Answers

SOURCE: Picture on RCA TV shrinks to a horizontal line

Hello,
Sounds to me you have a cold solder joint ( loose solder connection ) on the printer circuit board around or on the vertical chip or on one of the vertical capacitors. You may also have a bad vertical chip or a bad vertical capacitor, but I doubt it since it did come and go. I'de get a soldering iron and some solder and touch up the connections. I will remind you that you need to always excersise saftey by making sure, before removing the back, unplug the TV from the wall, and use care not to come in contact with the large red wire going to the back of the picture tube as the picture tube can be turned off and still store lots of voltage ( up to 35,000 volts). Always stay safe and when soldering, use care not to run solder across places that will make a short.
Good Luck and I hope this helps
Ed Meshechek ( Radio Man )
NC Electronics
Mills, Wyoming
307-266-4675

Posted on Dec 19, 2008

daniel719
  • 240 Answers

SOURCE: Shrinking Picture

problem is bad soldier on the vertical IC , this part needs to be resoldier to solve your problem, its a simple job for any tv repairman.

Posted on Jan 11, 2009

  • 1 Answer

SOURCE: Shrinking Picture

daniel719 was correct - my local TV repair guy fixed it for $65 and told me the TV would be good gor another 5 years easy - Yay!!

Posted on Jul 30, 2009

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1 Answer

TV Picture shrinks down more and more until it gets to a line.


You may have a cold solder joint around the Vertical circuit. Resolder the pins of the LA7833 IC and the components around the IC.
Check the C308 220uf/35V & C320 100uf/50V.
Nous Sabre.
www.aaatvservice.com

Jan 28, 2012 | Toshiba 32A33 32" TV

1 Answer

Picture goes to a single horizontal line.


Your problem is due to failure of the vertical scanning circuits in your TV. This is quite common and is caused by aging components. Generally drying out capacitors
You got to be careful not to leave it on too long when the picture collapses, it will burn a permanent line across the screen.
If you are an electronics expert you can fix it if you get a schematic. If not please don't attempt to reapir it yourself since there is high voltage in side the TV.
The problem may get worse with time.

Mar 13, 2010 | Toshiba 32D46 32" TV

2 Answers

My picture turns into a white line and comes back if you hit the front bottom of console?


I think you flyback transformer is going out. Eventually it won't come back when you hit it.

Oct 30, 2009 | Toshiba 32A33 32" TV

1 Answer

When the TV is first turned on, thin white lines appear horizontally across the top 4" of the screen. The lines go through the picture, distorting it. After the TV is on for a few minutes, the depth...


On this particular model there is one capacitor from the video process IC (jungle IC) that supplies the Vertical pulse that shoul be changed.
This is an easy repair if you've ever soldered and would not be too costly for a repair shop to do it for you. The problem is a bad Vertical Output IC (usually mounted on an aluminum heat sink with the part on it labeled LA78?? ) and 1 or 2 bad capacitors. Some times you can even fix the problem by re-soldering the contacts of the IC- To find the IC follow the 4 wires that come from the Yoke (which is a contained coil of wires slipped over the neck of the picture tube(s)) back to the board. 2 of the wires go to the horizontal o/p and 2 to the Vertical o/p the thinner gauge wires are for the vertical. Be sure to vote/rate me if this helped Thanks!

Oct 23, 2009 | Toshiba 36A50 36" TV

3 Answers

Pictures shrinks.. Panasonic TC-20LM Television


Shrinking picture is a voltage regulation problem in the switch mode power supply, Possibly a cap used in the feedback circuit. Or an over current condition on the B+. This is a very tech intense repair because there is no magic bullet. If it is shrinking on bright scenes then you can bet it is a regulation problem, bright scenes draw more current from the power supply causing this effect. I would not suspect the horiz output because the regulation for this circuit usually comes from the main switch mode power supply. One diagnostic is to monitor the B+ going to the horizontal output and see if it fluctuates. If so you can bet it is a cap or optical coupler in the switch mode circuit.

Oct 10, 2009 | Panasonic Standard (CRT) Televisions

1 Answer

No picture, has sound


This problem usually lies on the horizontal output transistor, try to check also for shorted diode. you can buy ftom any electronic parts dealer or radio shacks stores

Jul 27, 2009 | Sony FD Trinitron WEGA KV-32FS120 32" TV

2 Answers

Shrinking Picture


problem is bad soldier on the vertical IC , this part needs to be resoldier to solve your problem, its a simple job for any tv repairman.

Jan 10, 2009 | Toshiba 36A40 36" TV

1 Answer

GE 31


check electrolitc capacitors in horizontal circuit

May 09, 2008 | GE 31GT659 31" TV

3 Answers

Toshiba CF30E50 TV shuts off


Best first step is: Good visual inspection = look for hot spots
on PCB, check caps in those areas + solder any/all bad connections,esp. low voltage regulator pins.Look the whole
board over with magnifier = solder,solder,solder...T.

Oct 25, 2007 | Standard (CRT) Televisions

1 Answer

Sony Trinitron kv32fs16 picture shrinks


You have a bad solder connection in the vertical circuit. This will require you to resolder these bad connections before it blows out the vertical output IC or other parts in the circuit. Do this ASAP before you make a small repair into a large one. If you have no solid state printed circuit board experience, please play it safe and take the set into a pro to do this for you. Good Luck

Jun 28, 2007 | Sony FD Trinitron WEGA KV-29LS35 29" TV

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