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Amongst all the electronic fix content articles that I have despatched to you, this approach is take into consideration a minor bit perilous if you do not know what you are executing. For those people who are new in this field I suggest that you only utilize it with the support of a senior tech. Review this report very carefully and the needed precautions that one need to acquire before starting off to use this trick. Even so, if you think that you have the courage to check out, then go ahead to execute the check.
A 15″ Philips 105s7 Monitor arrived in with the criticism of show blur. Normally the initially matter that a technician will do is to tune the concentrate adjustment knob at the flyback transformer to get a sharp photo back again. However, in this circumstance even though tuning the focus as an alternative of expecting a sharp photo, you get a brighter raster (white history) with flyback retrace strains throughout the monitor. Typically when you switch the focus knob, only the character get sharper with out affecting the raster and this is also accurate when you tune the display (G2) knob adjustment, only the raster will have effect but not the target.
Considering the fact that modifying the focus regulate has influence on the raster, this clearly tells us that there have to be one thing that had absent completely wrong in the monitor. With this difficulty, I could only believe of 3 places that I have to examine i.e a shorted flyback transformer divider community, a faulty CRT socket and a faulty photo tube. In buy to ensure if the flyback transformer divider is shorted or not is quite simple. Just use a Monitor blur buster (MBB) and defeat the first emphasis and display cable by connecting the concentration and monitor cable from the Monitor blur buster. Now tune the concentration or monitor manage at the MBB to see if the photo gets sharp or not. If you get a sharp picture we can conclude that is the flyback transformer divider network that is defective and if the image stills blur then it can only be the CRT socket faults or a bad image tube.
In buy to verify if the CRT socket is the result in of the trouble, one particular just has to switch with yet another functioning CRT socket to see if there is any enhancement in the image. If it continue to blur then I think you are now positive as which a single is the correct induce of the picture blur dilemma-it is the CRT or photo tube! If it is photograph tube difficulty, then you may possibly ask, can it be maintenance or not due to the fact a image tube is a vacuum tube that can not be disassemble? Of course, it can be accomplished but with some safeguards that you require to consider.
To repair service these kinds of problem, a single need to 1st fully grasp how a picture tube was manufactured in particular the electron gun. I will not likely go also particulars about electron gun but I will permit you know that the concentrate and the display G2 plate is the nearest and if there are any dirt’s or particles that experienced occurred to be involving the two plates, then it would definitely influence the exhibit (image results in being blur, dim or much too bright with flyback traces).
When you have particular that the bring about of the problem is photograph tube, now take out the CRT board from the neck of the photo tube and locate the pins of display (G2) and concentrate. If you appear at the photograph, most of the CRT pin outs is almost the very same apart from to some Sony Trinitron tubes. Link an alligator clip in between the focus pin and chilly floor and the G2 pin to the shaft of the flat style screw driver. The reason for connecting the alligator clips in this sort of a way so that the produced Monitor substantial voltage (about 24 kvdc) can be use to spark off the internal shorts in the electron gun involving the emphasis and G2 plate.
Before you swap on the Monitor, please make positive you disconnect or unplug the VGA sign cable from the CPU if not when the discharge starts it may well demolish the CPU VGA card. Not only that, be sure to check any surrounding in the Monitor as no additional wires or cables touches the energy area, if not it could blow the ability provide. As outlined in the over very first paragraph that this strategy definitely want you to be particularly cautious and warn so that nothing at all would take place when you start off to discharge the superior voltage by means of the anode cap.
If you are prepared now, hold the cope with of the screw driver (keep in mind, the tackle have to be thick or else certain of the substantial voltage might jump throughout and discharge by way of your hand) with your still left hand and electrical power “ON” the Monitor. At the time the large voltage have existing (with the hurrying audio you’ve listened to), now change off the Monitor by urgent the front panel on/off button, you then immediately poke in the screw driver shaft to the anode just before the substantial voltage becoming discharge by the bleeder resistor in the flyback transformer. In other words, we want to employ that limited second of the significant voltage to spark off the shorts in the electron gun prior to the substantial voltage staying completely discharged.
Commonly you will hear a “pop” audio when the superior voltage arc via the screw driver shaft at the anode cap. Repeating this for few occasions and the shorts definetely will go absent. Connect the CRT board again and check the Monitor to see if the trouble has been solved or not. Assuming the Monitor nonetheless blur soon after couple of of the discharged, you can normally reverse the alligator clips exactly where now you are connecting the G2 pin to chilly floor and employing the concentrate issue to poke by the anode cap. This will commonly obvious the shorts absent
Don’t forget, the blur challenge in this report is completely various from the blur difficulty (blooming) induced by a faulty flyback transformer divider network wherever you need a Monitor blur buster to fix it. Making use of the method over I have solved loads of this Monitor blur dilemma regardless of whether it is a 14″ or 21″ Monitor!
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