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!

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Wednesday 27 February 2019

SONY WEGA TRINITRON KV-HA & KV-HW SERIES TVs HORIZONTAL OUTPUT TRANSISTOR BLOWS OUT

SONY WEGA TRINITRON KV-HA & KV-HW SERIES TVs HORIZONTAL OUTPUT TRANSISTOR BLOWS OUT

Horizontal output transistor [2SD2624-CA] blows off as soon as the set is switched ON; without allowing time to find the fault by any measuring instruments.

There are two resons for this fault.
The first one is with its deflection yoke.  If any turns in the winding of the deflection yoke get shorted each other, the horzontal output transistor will get shorted [collector to emitter].  But this fault is very rare to Sony Televisons.
The second one is with fault capacitors at the horizontal output circuit.
Beofre switch ON the set, after replacing the horizontal output transistor, replace these capcitors.  [C-812-0.033MFD; C-811-1MFD 250V; C-807-330PF 2KV; C-808 0.0082MFD; C-814 12KPF; C-813 330PF.
In most cases, dry soldering points at the terminals of C-812 or value detereiation of this capacitor will be the cause. If you switch ON the set without C-812, it is sure and certain that the horizontal output transisoor will get shorted.  Replace this capacitor with same capacitance value.  If the value changes, it will effect both high-tesion voltage and width of the picture. Select a good quality one.

This fault is common to all CRT based televisions, irrespective of brand