Display Vertical Jump In Philip 17" 107E51

Usually the first thing that you do when you see any vertical jump in display would be vertical section. In this monitor, it is using the TDA8172 ic as vertical driver. Looking for any dry joint, burnt resistor or even a budge capacitor is very common as a first step to find out the culprit. But in this case the monitor looks new and the vertical section components are all intact and clean. The first thought that came to my mind was to check the electrolytic capacitors surrounding the vertical for any high esr reading. Well, the caps were all ok! From my previous experienced, i knew that the metallised polyester capacitor can develop intermittent problem or increase in ESR. So i check for any of this capacitor nearby this vertical ic. Yes, tracing from pin 5 of TDA8172 found one of this capacitor with the value of 334 100v which mean .33 microfarad 100 volt! Checking the capacitor on board with my dick smith esr meter showed that it has a very high esr reading about 53 ohm (dick smith esr meter can measure esr value until 99 ohms). When i compared with a known good and same value/voltage capacitor, it has a 4.2-4.4 ohms!
The value of the bad capacitor was way off from the good one. Replacing with a new capacitor solved the vertical jumping problem.
The bad capacitor when checked with digital capacitance meter it showed .32 microfarad and in the acceptable range. Checking the same cap with analog meter also can't reveal any defective sign in the capacitor. Sometimes only experience can tell on which meter you should depends on when troubleshooting this type of problem. Conclusion, in order to accurately check or measure a capacitor one need to test the capacitor for dielectric strength, esr, capacitance and leakage and all this can be done using the Sencore LC102 OR LC103 tester. However, if you do not have esr meter, just direct replace the suspected capacitor and retest again and hope the symptom will gone and of course this way will take you a lot of your precious time.