Question about LG Televison & Video
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Posted on Jan 02, 2017
SOURCE: Grundig tv Davio T51-3101 TOP.
You either have a Faulty Horizontal Oscillator IC? OR something, on that 1.3 V Output, is dragging that output down and on that output, something drawing too much current, and causing the IC, to not be able to drive to it's full potential, usually 5 V DC in a logic circuit, but if CMOS, then even 12 V DC.
All one can really do, is find the "Cause" of the low output, remove the "Fault" and/or change the IC, too (It's most likely damaged anyway? So I usually do)
You need to get the parameters of the IC & Semi's that you are working with and check the output against what it should be.
Also, you did not indicate if you were using a service manual. If not, then I implore you to obtain one, as without it, one really cannot work effectively.
As I always used to say to my students: Are Your Voltage Correct? Specifically, starting with the PSU, as if this isn't 100%, nothing else can be. Anyway check all voltages around your IC's & Semi's. Also remember the technique of "Cut & Test" too, isolating parts of the suspected circuits, by cutting a trace, or chopping a Leg or Pin, on a Semi or IC, can be useful in tracing where the fault is going. One other thing is Current Measurement, cutting into a circuit, and inserting the Ma meter, into the circuit, will also soon show you where the problem is, reduced current usually indicates a "Short", a high current usually show a disconnection, or "Open" circuit.
Hope this helps.
Posted on Aug 27, 2010
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