Check No Display - How To Repair Likom No High Voltage Issue

Very well, no exhibit can be no significant voltage, failure in G1, G2 and heater circuit, faulty flyback transformer, failure in image tube and microprocessor or several other good reasons . In order to locate out the solution we have to swap on the Observe. On switching on the check, I could not hear any sound from the keep an eye on but the energy led is on (green mild). You can't experience any static at the glass of the photograph tube. This could be a signal of no large voltage symptom.

Anyhow, I have to use my faithful Kaise SK9000 significant voltage probe to check out if the substantial voltage current at the anode. Sometimes if you can't really feel the static at the glass of CRT, doesn't necessarily mean that the substantial voltage is not current. It's only minimal in high voltage say could be 10 to 12 kilovolts. Low higher voltage and no substantial voltage are absolutely two various signs. In the over scenario, my significant voltage probe registered zero volts! So it's confirmed no large voltage difficulty.

There are several good reasons for no high voltage trouble. A missing B+ voltage, a faulty flyback transformer, no horizontal drive pulse from h/v oscillator ic, reduced or lacking provide voltage to horizontal driver transformer and and so forth could trigger no high voltage. The first point that I have checked was the flyback internal capacitor-the capacitance is within just the normal assortment which is 2.7 nanofarad. If the inner capacitor is shorted, it would cause no great voltage. The 2nd position that I have checked to be okay was the B+ voltage. It confirmed about 50 + volts and this suggest there is supply coming into the B+ pin of flyback transformer.

When checking the third level (the voltage at the main winding of horizontal flyback transformer), I identified that it has zero volt which is incredibly uncommon. The base push energy supply input has about 14 volts but immediately after the resistor it confirmed zero volts (by right it need to have about 12 volt-voltage drop soon after the resistor). When I placed my finger on the base push ability resistor just right after switching off the Keep an eye on, I could felt it was extremely very hot. Now this is what we phone a clue. A good functioning base generate strength resistor won't get very hot till it burns your finger! There ought to be a thing that has gone improper or shorted that tends to make the ability resistor turned incredibly very hot. From the outcome we get, we can say that the horizontal push circuit is acquiring trouble so my focus is on this circuit.

A shorted horizontal driver transformer main winding, horizontal driver transistor, components surrounding this circuit could cause the power resistor to flip very hot. The horizontal driver transformer key winding can be verify by applying a dick smith flyback tester even though the horizontal driver transistor and encompassing components can be test with a ordinary multimeter. The outcome, shockingly not even a single component in this circuit found to be faulty.

Seeing that I could not find the defective parts, the only way to discover out the culprit is to come out with my own schematic drawing base on this observe circuit (employing keep track of circuit idea to solve issue).