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Onida 29 inches tv crt tube excess width problem

I have changed an 12kcapacitor to collector to grond via diode to the line output transistor but no result found

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

robotek
  • 1512 Answers

SOURCE: Samsung CXM2785TP

it will have a short in the vertical stage or power supply to it, and maybe even a power supply regulation failure(high voltage) that set the whole thing in motion. I will do some research for you and get back real soon :)

Posted on Feb 01, 2008

  • 1 Answer

SOURCE: cathode ray tubes (crt) for a Sony Rear Projection TV Model# KP-65WV600.

We have a problem with the blue as well. Sometimes it is good, then it fades to green. Then it went out and back on again. Repair man said it is a bad HT Block and would cost $350 to remedy.

Posted on May 16, 2008

yammy_alf
  • 666 Answers

SOURCE: my 20 inch lg tv crt monitor will not show a

is video show on vcr player? if yes you need to replace jungle ic which is switching line from tv tuner to line in video.

Posted on Apr 04, 2010

  • 1 Answer

SOURCE: sony crt tv 29" PINCUSHION PROBLEM

MY SONY DOES NOT DISPLAY NUMBERS ,VOLUME,MENU PANAL

Posted on Oct 22, 2010

  • 1 Answer

SOURCE: I have got Samsung Plano 29 inch TV. I see

I have got Samsung Plano 29 inch tv. I see redgreen and white color lines at the top of the screen.this slides down till the middle of the screen. Please suggest

Posted on Nov 25, 2010

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1 Answer

Lg crt 29 inch tv wont start


The frame amplifier, like the line amplifier, will not work if there is no output from the oscillators for them to amplify.

Early 405 line sets didn't have a frame oscillator as they used the sine wave from the AC mains but I believe the later sets needed a frame oscillator and a sync signal from the rf demodulator to prevent instability.

Transistors rarely fail by themselves and it is often external factors that cause them to overheat and fail and an essential part of the repair process is discovering what factors caused the initial problem. Modern circuits use a lot of multi-transistor dc coupled stages and it is often the bias of an earlier stage that is the culprit.

The frame output transformer is usually very robust and much less likely to fail than a line output transformer. I suggest you ensure the correct operation of the oscillators before going any further.

Aug 30, 2016 | LG Televison & Video

4 Answers

I have a 27 inch panasonic and have about 19 real thin lines across the top of the screen. It is in the top 4 inches of the picture tube.Model CT-2701G Built 9/03


Scan coils (field) measure about 5 to 15 Ohms from the plug where they connect to the main PCB
Look for the cables that come down from the scan coils (deflection yoke) to the main pcb
its either two cables and two plugs or a 4way cable with one plug to the main pcb
2 of the wires goto the vertical(height) and 2 to the width
try to work it out which (the fattest wire is width)
The width ones go towards the loptx(line output/flyback transformer),
and the height ones go to the field output chip (or transistor pair) Follow the printed circuit from the plug and look for a 7 or 9 pin chip on a cooling plate(heat sink for the posh),
it should have a diode connected to it and about 25v on both ends of the diode.
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Jul 14, 2008 | Televison & Video

1 Answer

Onida 29"ctv has width problem. While tuning the fst screen will enlarge...how to solve this fault


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in this key phrase " my service table today " in the search box at the top right of the display window of the home page, to get gathered some pages which has the details of practical experiences to the author of that site.

Jan 03, 2016 | Televison & Video

1 Answer

Onida igo 20 '' ctv t v 110 voltage one second


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Check the horizontal output transistor for collector to emitter leak.

Sep 18, 2014 | Televison & Video

1 Answer

Am I testing this horizontal output transistor correctly?


Check the resistance between collector and emitter. It should never be Zero Ohms.

Dec 01, 2012 | Symphonic Televison & Video

1 Answer

Toshiba tv 32a43 power button flashes red and won't turn on


Check to see if horizontal output is shorted, But will have a damper diode, between the base and emmitter, will read 0 ohms. That's okay to check like that, Check for shorts between collector and emitter and collector and base. If ok, check for 130v dc on the collector of the horizontal output transistor.

Mar 26, 2011 | Toshiba 32A43 32" TV

1 Answer

My 36xbr800 blinks six times then pauses then blinks six times, this is repeated......


Check the voltage input to horizontal output transformer [LOT]. Check the voltage at the collector point of the line drive transistor. If the line drive transformer primary gets open this type of fault mau occur. Also check the frequency ant the collector point of line drive transistor and the base point of line output transistor. It should be aroung 15625 Hz.
Check and replace the horizontal output transistor if needy. Replacing it is better. The horizontal output is not working or a short in secondary power supply of SMPS or lot secondary, is your problem

Oct 14, 2010 | Sony FD Trinitron WEGA KV-36XBR800 36" TV

1 Answer

Zenith tv, video retrace lines.


how is the 200 volt supply to the video output transistors??
measure the collector voltage of the video output transistors with the crt board on and off the crt. if voltage goes up when crt board is off then crt shorted

Apr 28, 2008 | Zenith Z25X22S 25" TV

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