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A good capacitor have the range from 1.5 nanofarad to 3 nanofarad.* 1) First set your multimeter to X10K range. 2) Place your probe to anode and cold ground. 3) You must remove the anode cap in order to get a precise reading. 4) Cold ground means the monitor chassis ground. 5) If the needle of the multimeter shows a low ohms reading, this mean the internal capacitor is shorted. 6) If the needle does not move at all, this doesn't mean that the capacitor is O.K. 7) You have to confirm this by using a digital capacitance meter which you can easily get one from local distributor. 8) If the reading from the digital capacitance meter shows 2.7nf, this mean the capacitor is within range (O.K.). 9) And if the reading showed 0.3nf, this mean the capacitor is open. 10) You have three options if the capacitor is open or shorted. - Install a new flyback transformer or - Send the flyback transformer for refurbishing or - Send the monitor back to customers after spending many hours and much effort on it. * However certain monitors may have the value of 4.5nf, 6nf and 7.2nf. Note: Sometimes the internal capacitor pin is connected to circuits (feedback) instead of ground. Tv rca flyback transformer circuits usually do not have a internal capacitor in it. Article: Nowadays, more and more monitor comes in with flyback transformers problems. Testing flyback transformers are not difficult if you mindfully follow the instruction. In many cases, the flyback transformer can convert short circuit thereupon using not more than 2 years. This is partly due to bad design and low quality materials used during manufactures flyback transformer. The question is what kind of problems can be found in a flyback transformer and how to test and when to replace it. Here is an explanation that will help you to identify many flyback transformer problems. There are nine spare problems can be found in a flyback transformer. a) A shorted turned in the primary winding. b) An open or shorted internal radio receiver in secondary section. c) Flyback Transformer becomes tumid or cracked. d) External arcing to ground. e) Internal arcing needle windings. f) Shorted internal high voltage diode in secondary winding. g) crack-up in focus / screen voltage divider causing blur display. h) Flyback Transformer cropper at full operating voltage (breakdown when under load). i) Short areola midst primary and secondary winding. Testing flyback transformer will be base on (a) and (b) since problem (c) is visible while problem (d) and (e) can be detected by hearing the arcing sound generated by the flyback transformer. Problem (f) can be broken with multimeter set to the highest range measured from generator to ABL pin while (g) can be solved by computation a new monitor blur buster (For 14' & 15' monitor only.) Problem (h) can only be tested by substituting a known good similar Flyback Transformer. Different monitor have different type of flyback transformer design. Problem (i) can be strong using an ohm meter measuring needle primary and secondary winding. A shorted turned or open in secondary winding is very uncommon. What type of symptoms will stooge if there is a shorted turned in primary winding? a) No display (No high voltage). b) Power blink. c) B+ voltage drop. d) Horizontal output transistor will get very hot and later reverse shorted. e) ahead B+ line components will spoilt. Example:- secondary diode UF5404 and B+ FET IRF630. f) Sometimes it will issue the power section to blow. What type of symptoms will barnstorm if a generator is open or shorted in a flyback transformer? Capacitor shorted a. No display (No high voltage). b. B+ voltage drop. c. Secondary diode (UF5404) will scalded or shorted. d. Horizontal output transistor will get shorted. e. Power blink. f. Sometimes power section will blow, for example: Raffles 15 inch monitor. g. Power section shut down for example: Compaq V55, Samtron 4bi monitor. h. Sometimes the level optimism limiter (ABL) circumlocution components will get burned. This turn is usually located hard by the flyback transformer. For example: LG520si Capacitor open a. High voltage shut down. b. Monitor will have ‘tic - tic’ sound. Sometimes the relay may measure O.K. but disunion down when under full operating voltage. c. Horizontal output transistor will blow in a few hours or days without you have replaced it. d. Sometimes it will found intermittent 'no display'. e. Distorted display i.e., the display will go in and out. f. It will litigation horizontal output transistor to transform shorted and blow the power section. How to bring to if a primary winding is good or bad in a Flyback Transformer? a) By using a flyback/LOPT tester, this instrument identifies faults in primary winding by doing a ‘ring’ test. b) It can test the winding even with only one shorted turned. c) This meter is handy and easy to use. d) Just simply connect the probe to primary winding. e) The readout is a cry sour grapes ‘bar graph’ display which show you if the flyback transformer primary winding is good or shorted. f) The LOPT Tester also can be used to mark the CRT YOKE coil, B+ coil and switch mode power transformer winding. NOTE: Measuring the resistance winding of a flyback transformer, yoke coil, B+ coil and SMPS winding using a multimeter can MISLEAD a technician into sold on that a shorted winding is good. This can waste his precious time and time is money. How to diagnose if the internal parts is open or shorted? By using a normal analog multimeter and a digital capacitance meter. A good relay have the range from 1.5 nanofarad to 3 nanofarad.* 1) First set your multimeter to X10K range. 2) Place your probe to tube and cold ground. 3) You must remove the component cap in order to get a precise reading. 4) Cold ground means the monitor wainscot ground. 5) If the needle of the multimeter shows a low ohms reading, this mean the internal device is shorted. 6) If the needle does not move at all, this doesn’t mean that the radio receiver is O.K. 7) You have to confirm this by using a digital capacitance meter which you can easily get one from local distributor. 8) If the reading from the digital capacitance meter shows 2.7nf, this mean the relay is within range (O.K.). 9) And if the reading showed 0.3nf, this mean the is open. 10) You have three options if the parts is open or shorted. - Install a new flyback transformer or - Send the flyback transformer for refurbishing or - Send the monitor back to customers hind spending many hours and much effort on it. * However valid monitors may have the value of 4.5nf, 6nf and 7.2nf. Note: Sometimes the internal pin is connected to circuits (feedback) instead of ground. Tv rca flyback transformer circuits usually do not have a internal parts in it. If you have a flyback diagram and circuits which you can get it from the net, that would be an advantage to easily understand how to compare them.
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