Question about Televison & Video
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
CK power supply for Bad capacitors they will be vented,swollen or puffed up on Top 1000uf 16v 220uf 10v 3300uf 10v.
Posted on Aug 25, 2010
• Check Horizontal Oscillator to Horizontal Drive.
Horizontal oscillator should have an standby voltage,
and another one when Flyback
• Check vertical Circuits for possible cold solder joints
here are additional guide :
a) basically it has to be acted upon by a supply voltage of at least 95V to work. sample picture
Posted on Aug 26, 2010
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Posted on Jan 02, 2017
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