Question about Philips 36PT842H 36" TV
If this isn't due to a decaying capacitor, you may be able to correct the focus.
PLEASE NOTE! Once the rear housing is removed, there are many points where dangerous voltages exist!
Please use caution and behave like there is a live rattlesnake hiding in the unit.
The rear housing on most is secured by only a few screws; four at the corners and perhaps two located around the cutout for the connectors. Don't remove any connectors by accident, they are normally mounted on a panel.
Once the housing is removed, you will need at least a very well insulated flat blade or #1 Phillips screwdriver - specially insulated tools for this kind of work can be had but if caution is used, normal ones will work.
You may have to remove the AC cord from the rear housing to use it to power up the set if it is attached.
Locate a largeish object that has a thick cable coming from its top and connected to the picture tube that will have a rubber cover over the connecting point on the tube. This device is the 'flyback' or horizontal output transformer. It will have two, sometimes three protruding adjustments. I recommend having a mirror positioned in front of the set so you can see instantly what is happening when you adjust it. Keep kids well away from the set, better yet, out of the room completely; they can distract and even get hurt if they move quickly.
One of the adjustments will affect the brightness - adjust any of these very slowly, you can damage the picture tube (CRT) if the brightness is turned too high and if misset, will create slanted white stripes across the screen if set too high. Another of these adjustments will affect the focus; this is the one you want to adjust. If there is a third one, it may affect focus on a part of the screen but not all of it.
If you get the brightness first (this adjusts the actual *very high* voltage that is connected via the thick cable), put it back where it was and try another.
You should be able to improve the sharpness of your video to its optimum again if the problem is not related (as previously stated) to a failing part. If you cannot improve the focus, then it is time to turn it over to a tech to troubleshoot.
Posted on Jan 28, 2009
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Posted on Jan 02, 2017
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