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.
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Friday, 8 February 2019

SONY TRINITRON [KV20 - KV21 SERIES] [BA-4D CHASIS]. FAULT - CONTINUOUS BLINKS OF STANDBY LIGHT, NO PAUSE

SONY TRINITRON [KV20 - KV21 SERIES] [BA-4D CHASIS]. Fault - Continuous blinks of standby light, No Pause


Continuous blinking of standby light with this models Sony sets indicates that there is some short or data missing from serial data from system control IC (001 – M37273MF-252SP). Pin number 38 of this IC is Serial Clock, and 37 are serial data output.  Check the voltages at these two pins. Check the voltage at pin number 37.  It should be around 3.5 to 4.3 VDC.  If you have an oscilloscope or a millimeter which can measure frequency. Check the digital waveform or frequency with it. All other functions of this TV is controlled by these two signals emerges from the above said two pins of the IC.  If it found Ok, surely the memory IC (IC003-M24C04-MN6T) is faulty.  Replace the memory IC with same type and number.  When you replace this IC, insist on same number, otherwise set won’t even refuse to switch ON.  Check the oscillator crystal (X001) soldered to pin number 25 of the main system IC.  Check the frequency at pin number 25.  If it is found abnormal than specified, replace the oscillator crystal. Check the resistors connected to pins 37&38 [R003 & R032] respectively, for continuity.  If all of these are OK, and still fault is there, check all the solder terminals of this main system control IC, for any dry solder, or loose solder.
Normally, a loose solder to IC terminals are very difficult to detect, as it will be very microscopic, as we cannot detect it without the help of a magnifying glass.  The best practice is, to resolder all the soldering of this IC, by applying a little more solder, without making any solder short bridge in between adjacent solder terminals.  You must have a concept of soldering, and steady hand to do this work.  More important is the patience and concentration