It's said that the television troubleshooting is started from the feeling of the strange of picture of sound, ended to check the normal operation. Therefore understanding of symptom is the source of shooting and short way of able to repair with efficient and sure and also it is very important to obtain the further more information from it, but sometimes television problems, which we think are complex, have lots of simple solutions. For example, your TV suddenly turned off and wouldn’t turn on. Don't conclude right away that your problem is a big one, since you haven’t really looked through it. The problem might just be a blown fuse or bad connection with the switch cable and whatnot. If for some reasons, you are still having difficulties, just relax. A problem can hardly be solved by very problematic and tired hands and mind.

Here are some tips that you can use when troubleshooting:

    First of all, try working in a wide open area that is clean and well-lighted. This helps you see the parts of your unit clearly and also makes it easier for you to find small parts that fell on the ground.

    When you start working on your unit, be sure to write notes and draw some diagrams regarding your unit. This will be really helpful when you reassemble your unit. Switching cables to wrong places may cause another trouble, so be sure that you noted where they should be inserted in.

    When disassembling your unit, be sure to sort out the small parts like screws and store them into small containers. This doesn’t only prevent you from losing small but important parts, but it also makes it easy for you to figure out which part should be with this or that part.

    It is not easy to repair the TV sets with prompt and accurate by clarifying the reason of trouble out of a great many components unless the composition of each circuit and the flow of signal should be understood systematically. The diagnosis of trouble in TV receiver usually can be localized a major section by observing the symptom of it. That is, an efficient order of diagnosis, first divide the total into the two blocks and find the block in which the trouble occurs, and again divide the block into two more in detail, by this repeat procedures, localize to narrow section, and detect the component caused to be trouble.

    If you wish to presume the circuit of troubled, you should know the flow of signals and each operation ,and understand the situations for the troubled circuit corresponding to its symptom. While as above mentioned, the diagnosis of trouble in TV receiver can be localized to narrow section by observing the raster and picture and by listening to sound.

Here are the order of diagnosis is progressed as follows.

1) Observe the symptom of trouble
2) Presume the troubled circuit from the symptoms
3) Localize the trouble to a narrow section(circuit break down)
4) Find the troubled component and check
5) Replace it by a good part of the same specification.
6) Make sure the set is operated normally.

Here are a few specific troubleshooting techniques.

    After applying some of the general troubleshooting tips to narrow the scope of a problem's location, there are techniques useful in further isolating it.

Remove parallel components

    If a system is composed of several parallel or redundant components which can be removed without crippling the whole system, start removing these components (one at a time) and see if things start to work again.

Divide system into sections and test those sections

     In a system with multiple sections or stages, carefully measure the variables going in and out of each stage until you find a stage where things don't look right.

Testing Without Power Applied

    In repair situations it is often necessary to test the board without power applied due to uncertainty as to the nature of the failure.

    When this condition occurs it is necessary to use multimeter to safely examine component signatures and validate good from bad.

Fault Detection on Undocumented Boards

    Repair of old television is a challenge when documentation is not available. Much of the test equipment on the market is ineffective in this situation as they require information that assumes a documentation package is available for the circuit to be tested. If you have a hard time looking for service manuals, try to find a closes model with almost the same circuit of the unit you working on.

You will only need a basic set of hand tools for disassembling and repairing television. This includes:

Multimeter (Digital or Analog), Philips screwdriver Straight-blade screwdriver, Socket drivers, Needle nose pliers, Wire cutters

    When disconnecting or replacing soldered wires in your unit, you will need a soldering iron and lead. Be sure to work properly on your solder connections because a mistake like using inappropriate soldering tool or soldering the wires incorrectly may cost you a lot of money and trouble. Remember, what we want here is to troubleshoot with as little effort and cost as possible.

Here are some examples of common problem on television sets; you can do it yourself without any technical knowledge or if your just a newbie's.

    One of the common malfunctions that occur in television sets is blotches of color, which may be particularly apparent around the edges or the center of the screen. This can happen if the television screen becomes magnetized, which will occur if the television is placed near other electronic equipment, such as stereo speakers. While most televisions contain a circuit that will automatically de-magnetize the screen, this circuit may be damaged or otherwise malfunctioning. To demagnetize the television yourself, you will need to purchase a strong magnetic coil: these can be found at most hardware or electronics parts store. Hold the coil in the upper left hand corner, a few inches away from the screen (you should see a rainbow pattern appear on the screen). Making small circular motions move the coil around the screen (the rainbow pattern should fluctuate). Increase the size of your circular motions until you have covered the entire screen and then slowly back away from the television set, continuing to make circular motions. When the coil loses contact with the screen, the blotches of color should be gone. In order to successfully demagnetize the set, you may need to repeat these steps several times.

    Another problem occurs in television set is the sound emits static noise. This problem is easy to fix by replacing a television speaker that emits static noise, but requires caution because it entails removing the back cover of the television set, exposing the high voltage lead that runs into the top part of the picture tube. Even if the television is unplugged, the tube can shock you; do not touch it in any way. You will also be required to purchase a replacement speaker which needs to match your current speaker in impedance, which will usually be indicated on the magnet. Begin by unplugging your television and laying it, screen down, on a soft surface. Remove any screws (usually Phillips head) from the back of the television shell. Then, pull back on the cover; if you feel resistance, you may have missed a screw or the cover may have snagged on one of the set's internal wires. Carefully remove these obstacles and set the cover aside. Identify the malfunctioning speaker (whichever one usually emits static noise), and replace it with the new one. Reattach the speaker in the same manner the old one was attached. Replace the television cover and attach with screws. Important: during this process it is very important to make sure none of the internal wiring of the television is jarred, twisted, or broken. Any damage to these components can irrevocably impair the function of the set.
   
    One more symptom that you can fix by yourself is if your television set has a tendency to shut off randomly, it is probably overheating. Permanently remove any objects placed on or too close to the television's ventilation slats. Use a small vacuum attachment to remove any dust that has built up there. This should successfully prevent your television from randomly shutting off again.

    Power problem? This one is a bit complicated if you have no technical knowledge, however it can be done by a newbie’s. No power, Check first the fuse, just trace the power cord to the main board and you'll find the fuse. If busted, try checking the power regulator if shorted. The power regulator is screwed on a heat sink and located near the big filter capacitor. Test the regulator on the board using a multi-meter check the collector to base and collector to emitter. If shorted, dis-solder the regulator and remove it then test the board where the regulator is soldered if shorted. If none, it means the parts to be replaced are the fuse and the power regulator.

    These four techniques will cure 50% of the problems that ail your television set, saving you time and money. If using these techniques does not work for you or if you feel unsure in performing any of them, a professional television repair person should be contacted. Ask for an estimate and a realistic appraisal of whether the set can be adequately fixed. If not, it may be time to shop around for a newer model.

    When buying part there are a lot of reputable parts dealers on the internet, make sure you get the facts and do your research before buying parts through them. Find out the OEM, or original equipment manufacturer. Find out the brand of part they sell, or the type of replacement part they sell. See if they have options and the differences between the options.

    For more information on television repair, please visit our TV repair and troubleshooting tips and download or ask for service manuals if you need one and if we do not have on our list you can try http://www.eserviceinfo.com/ and if you want to learn more on consumer electronics and appliance repair you can visit http://www.repairfaq.org/sam/ and for additional LCD/Plasma repair visit http://plasmalcdtvrepair.rankwell.net/. Hope this help.

_
» Analog to Digital
» Audio Equalizer Circuits
» Audio Mixer Circuits
» Audio Power Amplifier Circuits
» Ceramic Capacitor Code
» Component Identification
» Computer Common Trouble
» Computer Monitor vs. TV
» Computer UPS & PSU Schematics
» Computer Service Manuals
» CRT (Picture Tube) Resatorer
» Data Recovery
» DIY ESR Tester
» DIY Flyback Tester
» DIY Home Theater Connection
» DVD Code Unlocking Secrets
» Electronics Switch Circuits
» Electronic & Computer Ebooks
» Electronics Software
» Fast Accurate DC/DC Cont
» Fix Noisy Computer Fans with a Drop of Oil
» Grundig Planatron Plasma Training Manual
» Hitachi Training Manuals
» How to Diagnose PC Hardware Problems
» How to fix Mal function
» How to fix USB device not recognized in Windows
» How to improve your career in Electronics?
» How to Maintain Computer
» How to Repair a Laptops not Booting to Windows
» How to Repair a Laptops with Broken Power Connector Pin
» How to Repair a Laptops with Dim Screen Backlight Problem
» How to Speed up Computer
» How to Test an IC
» How to Test Capacitor
» How to Test MOSFET
» How to Test Transistor
» How to Use an Oscilloscope
» Interview w/ Pro Repairer
» JVC TV Power Supply Training Guide
» Keeping Your Computer Healthy
» LCD Component
» LG LCD TV 2007 Training Manuals
» Panasonic Training Manuals
» Pioneer Plasma TV Training Manuals
» Pixel Defects
» Plasma/LCD Firmware Update
» Plasma Tips/Service Hints
» Plasma: How it works?
» Philips Training Manuals
» Power Supply/Regulator Circuits
» RCA DLP Training Manual
» Repairing LCD's
» Samsung Plasma TV Training Manuals
» SMD Code Ebooks
» Sony Training Manuals
» Sony Tv Blinking code
» Strategies for Computer Repair
» The Parts of a PC
» Transistor Markings
» TV Diagrams Service Manuals
» TV Interconnect Diagrams
» TV Remote Codes
» TV Repair Guide
» Video Circuits
» VU Meter Circuits