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See us for computer upgrades and consumer electronics. Please click the linkfor computer hardware sales and custom built computers. Click to go back to OrpheusComputing. This notice is included in its entirety at the beginning. There is no charge except to cover the costs of copying. It is a tribute to the National Television Standards Committee NTSC that the color television standards agreed upon in the early shave performed remarkably well making quite efficient use of valuable radiospectrum space and the psychovisual characteristics of the human eye-brainsystem.
We will all come dtasheet expect its superiorresolution, freedom from noise and ghosting, and pure CD sound. Yet, theperceived quality of TV broadcasts and cable datssheet never likely be the majorissue with most consumers. Content will continue to be the biggest 2c3346. It is likely that in roughly 15 years, HDTV – digitally processed andtransmitted as 1s and 0s – will completely replace the current system. Acceptance in the marketplace is by no means assured but with the mergingof TV and computers – with the Internet as a driving force – it would seemthat the days of the stand-alone analog TV set are numbered.
A studio video monitor includes all of the functions of a television receiver except the tunerand IF which rarely fail except for bad connections or perhaps lightningstrikes to the antenna or cable connection. Therefore mostof the repair information in this document is applicable to both TVs andstudio monitors.
Modern computer monitors share many similarities withTVs but the multisync and high scan rate deflection circuitry and moresophisticated power supplies complicates their servicing. There has always been talk of ‘the picture on the wall’ display.
Whilewe are closer than ever to this possibility, I believe that mass productionof an affordable wall mural TV screen is still decades away. The reasonis simple economics – it is really hard to beat the simplicity of theshadow mask CRT. More of these panels go in the dumpster than make itto product do to manufacturing imperfections.
Projection – large screen – TVs may, on the other hand, be able to takeadvantage of a novel development in integrated micromachining – theTexas Instruments Inc. This is basicallyan integrated circuit with a tiltable micromirror for each pixel fabricatedon top of a static memory – RAM – cell. This technology wouldpermit nearly any size projection display to be produced and wouldtherefore be applicable to HDTV. Since it is a reflective device, thelight source can be as bright as needed.
However, this is still nota commercial product but stay tuned. Read, understand, and follow theset of safety guidelines provided later in this section whenever workingon TVs, monitors, or other similar high voltage equipment.
If you do go inside, beware: There is the added danger ofCRT implosion for carelessly dropped tools and often sharp sheetmetalshields which can injure if you should datasgeet a reflex reaction upon touchingsomething you should not touch. In inside of a TV or monitor is no placefor the careless or naive.
Having said that, a basic knowledge of how a TV set works and what cango wrong can be of great value even if you do not attempt the repair yourself. It will enable you to intelligently deal with the service technician. Youwill be datashet likely to be able to recognize if you are being taken for a rideby a dishonest or just plain incompetent repair center.
The majority of consumers probably do not know eventhis simple fact. Such a problem is usually due to a bad capacitor dstasheet other10 cent part. This document will provide you with the knowledge to datzsheet with a largepercentage of the problems you are likely to encounter with your TVs.
It will enable you to diagnose problems and in many cases, correct themas well.
2SC Toshiba, 2SC Datasheet
With minor exceptions, specific manufacturers and modelswill not be covered as there are so many variations that such a treatment wouldrequire a huge and very detailed text. Rather, the most common problemswill be addressed and enough basic principles of operation will be providedto enable you to narrow the problem down and likely determine a course ofaction for repair. In many cases, you will be able to do what is requiredfor a fraction of the cost that would be charged by a repair center.
Should you still not be able to find a solution, you will have learned a greatdeal and be able to ask appropriate questions and supply relevant informationif you decide to post to sci. It will also be easier to dofurther research using a repair text such as the ones listed at the end ofthis document.
In any case, you will have the satisfaction of knowing youdid as much as you could before taking it in for professional repair. With your new-found knowledge, you will have the upper hand and will noteasily be snowed by a dishonest or incompetent technician. TV prices have been dropping almost as fast as PC prices. Therefore, payingsuch prices for repair just may not make sense. Except for picture tubeproblems, most TV faults can be corrected without expensive parts, however.
Keeping a 5 year old TV alive may be well worthwhile as basic TV performanceand important features have not changed in a long time. The educational aspects may also beappealing. You will learn a lot in the process. Thus, it may make senseto repair that old clunker for your game room or beach house. I wouldsuggest the kid’s room but most TV watching just rots the brain anyhow soa broken TV may be more worthwhile educationally than one that works. Low voltage power supply some may also be part of 2.
Most of the lower voltages used in the TV may be derived from the horizontal deflection circuits. Sometimes, there is a separate switching power supply but this would be the exception. Degauss operates off of the line whenever power is turned on after having been off for a few minutes to demagnetize the CRT. These circuits provide the waveforms needed to sweep the electron beam in the CRT across and back some 15, times per second for NTSC.
The horizontal sync pulse from the sync separator locks the horizontal deflection to the video signal. These circuits provide the waveforms needed to sweep the electron beam in the CRT from top to bottom and back 60 times per second for NTSC. The vertical sync pulse from the sync separator locks the vertical deflection to the video signal. CRT high voltage also part of 2. Rather than having a totally separate power supply, nearly every TV on the planet derives the HV as well as many other voltages from the horizontal deflection using a special transformer called a ‘flyback’ or ‘Line OutPut Transformer LOPT for those of you on the other side of the lake.
Input is the antenna or cable signal and output are baseband video and audio signals. Very often, the tuner is a shielded metal box positioned on the bottom right as viewed from the front separate from the main circuit board. Sometimes it is on the main circuit board. The IF section may be in either place. On older or cheap TVs with a knob tuner, this is usually mounted to the front panel by itself. Input is the baseband video signal.
Outputs are the individual signals for the red, green, and blue video to the CRT. These are almost always located on a little circuit board plugged directly onto the neck of the CRT. They boost the output of the chroma demodulator to the hundred volts or so needed to drive the cathodes of the CRT.
Input is baseband video. Output is horizontal and vertical sync pulses to control the deflection circuits. The line level audio is amplified to drive a set of speakers. If this is a stereo TV, then these circuits must also perform the stereo demultiplexing. Most modern TVs actually use a microcontroller – a fixed program microcomputer to perform all user interface and control functions from the front panel and remote control. These are becoming increasingly sophisticated.
(PDF) 2SC3346 Datasheet download
However, they do not fail often. Older TVs use a bunch of 2sd3346 and switches and these are prone to wear and dirt. Most problems occur in the horizontal deflection and power supply sections.
These run at relatively high power levels and some components run hot. The high voltage section is prone to breakdown and arcing as a resultof hairline cracks, humidity, dirt, etc.
The tuner components are usually quite reliable unless the antenna experiencesa lightning strike.
2SC Datasheet(PDF) – Toshiba Semiconductor
Why projection TVs are not just normal TVs in big boxes: This creates an entire set of additional problems indesign. The average projection TV has about twice as many parts as its direct-viewcounterpart.
Some of the extra parts are essential for projection because CRTprojection tubes require dynamic convergence. The other extra parts have to dowith the fact that a more expensive TV also should have some extra features,like Dolby ProLogic sound, a satellite adtasheet and such.
Generally, the electronics are based on a standard chassis that is also usedfor direct-view CRT television. Even the deflection circuits require minoradaptations at most. So this requires aspecial high-voltage part, which also includes an EHT capacitor and bleeder. There will be 3 CRT panels with video amplifiers.
Dwtasheet of the extremelyhigh brightness, projection tubes will burn the phosphor screen immediately infault conditions so a protection circuit is essential. And last but certainly not least, there is the dynamic convergence panel. Theheart is a waveform generator IC, often of a Japanese brand but nowadaysthere’s also a digital variant by Philips. The old-fashioned way requires manymany potentiometers to program the waveforms.
Then there’s 5 or 6 convergenceamplifiers and a corresponding extra power supply. And usually this is wherethe single deflection circuits are distributed to the 3 CRTs. At the sametime the deflection currents are sensed for the protection circuits. In thefactory, a special corner is devoted to the assembly. There you’ll findspecially educated people and the datasheft of the assembly line is a lot lowerthan usual. It requires many more adjustments, e.