Question about RCA F25655BC 25" TV

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Stationary horizontal lines

My television has started showing stationary horizontal lines, spaced about 1/2 inch apart. Also, the picture is excessively bright. When bright is turned to the lowest setting, picture is still overly bright.

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Re: stationary horizontal lines

Thjeres a problem with the screen voltage driver voltage capacitor or the crt is going bad. have the shop test the b+ on the crt board first off . then remove the crt board and see if the voltage comes up. If it does the capaicitor is bad as it can take the load. But remeber theres extremly hi Voltage inside these sets so its never a good idea to try to do this your self unless you have the training to deal with HI Voltage and the proper saftey and test equipment. Good Luck

Posted on Jun 22, 2006

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My tv sony kv-xa21m61 display too bright and many horizontal lines. no picture

Vertical retrace lines is the problem. Thin white lines runs across the entire screen, at about an inch apart to each other. Check its video output supply voltage. Reduce the screen voltage to a little bit down and check. If you still wish to know more about this fault, check this site. Pull up older posts there.

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Check for excess screen voltage. Adjust the screen control to eliminate these vertical retrace lines. [Thin white line acorss the frull screen at about 1 inch apart.]

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At first it was lots of horizontal lines over the screen, and later TV screen went completely black. The sound still is perfect. Perhaps I just need to replace the fuse? I love this TV! Thanks...

You have stated that your TV has a lot of horizontal lines before it went off picture. We say that lines as retrace lines. So many of them will there on the entire screen, at about one inch or so apart, horizontaly scattered along with picuture. At that time, you may be unable to down the brightness control also. Even though you have reduced the brightness control to zero position, there will be some brightness level on the screen. You should have to repair that fault at the begining. There is a voltage going to the picture tube base, known as screen voltage. That voltage determine the emission of the picture tube, and we call it a bias voltage. When it goes higher than normal, this trouble ie retrace lines will occur. In long run it may spoil the picture tube itself. I don't know what the case of yours.
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From what I can understand, your problem is:
1. either a single horizontal line (from left to right), very bright, no picture but with sound, if yes then it is a failure of the vertical section. More often, it is the vertical IC that is at fault, sometimes the vertical capacitor. Still, in other cases, it is a case of cold solder; or
2. multiple lines across the screen with the picture overly bright and with sound. If yes to this one, then it is a matter of excessive screen voltage. This is adjustable using the HV Screen control that is at the rear of the Flyback Transformer.

Hope this be of some help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

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No Picture Has a bright horizontal line with off white & gray vertical bars

The Problem Philips 27TS54 c101 27B800-7562 White horizontal line in the center of the screen. Color is present in the first half inch of the leftist corner of the horizontal line.
Audio is present and controllable. The green power led from a cold non plugged in state remains solid until CRT goes to ignite. A click is heard then the green power LED blinks.
I found service manual diagram of repair part or parts and install instructions
I request any info or tips you might have pertaining to this problem
P.S. 25”-27” CRT board APT187

Possible Answer Posted by PEE_WEE 4/28/2005
On the CRT circuit board(picture tube), you will find R3340, which is a 10 ohm 1/3w resistor. The location of the resistor is printed on the bottom of the ckt board. It is burned open, replace with a 10 ohm 1/2w resistor. This will solve your problem. The original resistor was sized too small, should have been a 1/2 watt. This resistor is mounted standing up on ends. Mount the replacement resistor the same way. Be careful and don't get the circuit trace too hot and damage the circuit trace. (it's very small) The resistor is located on the crt(cathode ray tube), pcb(printed circuit board) socket. The resistor supplies apx +200v to the collectors of the r, g, b, video driver transistors. If this voltage is low, it causes excess brightness(excess beam current), causing the set to "shut-down". If the shut-down is too quick, you will NOT see the excess brightness, because the picture tube has not warmed-up enough to display anything on the picture tube. To see if the set displays "excess brightness", you will need to turn the set "on" about 5 to 10 times. This will heat the picture tube enough to display "excess brightness", IF that is the PROBLEM. Of course, there are OTHER defects that will cause a tv to shut down. There are built in safety circuits, that will "activate" if excess voltage/current or heat is detected anywhere in the set.

My resistors are not numbered the same on my crt board APT187. GSM 02/20/2008

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