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Re: white lines at top of av27230
Your posted description is a known (common) problem for the JAV-27230 and should be easily repaired. The vertical capacitor (C424 - 100uf/35V) needs to be replaced. It is relatively cheap and can be bought from any electronics parts store.
in some instances, it could be the vertical IC starting to fail or even a simple case of cold solder.
As always, extreme care when repairing the insides of a TV unit since HV can still be present even when off and unplug. A little knowledge of electronic components and use of a soldering iron should do just fine. Should you not be comfortable doing a DIY, then perhaps you can ask the assistance of a buddy who has some soldering experience.
Hope this be of some help/idea. Pls post back how things turned up or should you need additional information.
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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Type in this key phrase " my service table today " in the search box at the top right of the the home page, to get gathered some pages which has the details of practical experiences of the author of that site. The search result might display about 20 Nos of related posts. Press the "All posts" at the bottom of the list, then you can select them one by one.
it probably has leaky capacitors in the hyper board or the video process board, this repair requires a qualified tv repairman, you can't do it yourself, alot of actual repairman can't handle this repair. it will get progressively worse as time goes on the more leaky the capacitors become.
what you can do is take off the back pannel and there is a cord on the top of the board that looks like a computer board, there are many boards in the TV but the one I am talking about is twords the bottom where the video jacks plug in to the TV. Ok once you have located the pannel there is a cord on the top kinda tword the right side, it is many wires inside a black covering. What you need to do is just simply unplug it and plug it back in, do this as many times to try to fix the problem.
Sounds like insufficient vertical sweep and the top lines are getting out of control.
Check all the electrolytic caps in the vertical circuit for testing dry
(sorry - takes a special meter to do it in circuit) or just replace
them. Look the I.C. up in the free NTE crossreference at
nteinc.com get a diagram of its pinout to find what pins the power and
outputs are on.
Hope ya fix it!
This RCA set uses the CTC187BD chassis. Look on the back of the set and to the right of the cable connector you will see 2 controls sticking out, one on top of the other. The top control is for focus and the bottom one is screen, or overall brightness. If these controls have been turned clockwise then you will have a bright, fuzzy picture with white lines (retrace lines) through it. Tune in a channel with white letters on the screen and turn the top (focus) control until the letters are crisp and sharp. Go into the menu and turn the contrast and brightness all the way down, and then turn the bottom control (screen) until you can just see the picture, just above the point where the picture is too dark to see. Go back into the menu and reset the contrast and brightness and the picture will be back to perfect.