REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday, 8 February 2019

TV WORKS FINE. BUT WHEN YOU ADVANCE THE VOLUME, PICTURE JERKS AND GOES INSTABLE

TV WORKS FINE. BUT WHEN YOU ADVANCE THE VOLUME, PICTURE JERKS AND GOES INSTABLE

     This is a common fault to most of the picture tube based TVs.  When we advance the sound, the picture will jump, jerk, and will go instable.  I’ve experienced this fault for more times in my 40 years of continuous service work. I’ve checked and replaced most of the components in audio section, but went in vein.  The fault is very simple.  No multimeter test will help you to vet to rectify this problem.

The sets experience this type of fault will have a choke coil fitted in series with the secondary power supply point, which supplies voltage to Line Output Transformer. This voltage is supplied from the SMPS section of the power supply system.  Normally this voltage will be between 95 to 135VDC.  After rectifying this voltage. From the SMPS transformer by a diode. There will be a smoothing capacitor.  Usually this will be 160uF 250 V or so.  After that, there will be a coil. [Peaking coil], fitted in series with this supply.  After this peaking coil, an other capacitor will also be there.  It will be usually have ether value 22uF 250VDC. Normally this capacitor will be the cause to this problem. The values of these capacitors may vary according to sets.  Check these capacitors for damage.  Replace both of them with same capacitance value and voltage.  No other work should be done for this fault.