Question about RCA 27F500TDV 27 in. TV/VCR/DVD Combo

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Several dozen thin horizontal white lines across the top of screen, all channels

I have several dozen thin horizontal white lines appearing at the top of the screen. They are there on every channel whenever the TV is on. I have not tried a fix.

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Re: Several dozen thin horizontal white lines across the...

These beasts are monsters to get into and service without the proper extenstion cables and a service manual. there are no user replaceable parts inside this set. if you know solid state serviceing, you can try and fix it. There is a bad capacitor or capacitors in the vertical sweep circuit and or the vertical output IC is bad also. If you can solder and unsolder go for it. But if you do not or know how the circuit Works Please find a trained tech to assist you with this repair. Good Luck. PS please do not forget to rate this.

Posted on Oct 14, 2006

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Samsung TSL2793HF - Slight Right Side Pincushion and Horz Line Bottom to Top Until the TV Warms up

Yes, this is rare but I have seen it before--not fixable if it is what I think it is----It is what is called a Dome effect---the shadow mask in the picture tube is actually contracting and or expanding depending on temperature---

Directly behind the phosphor coating (the stripes that you see on the screen) is a metal screen--the holes or perforations in it line up with the stripes on the phosphor screen.

Some masks either have a material or a defect causing the dome effect----Not likely to be anything else---a Pin amp problem will not usually act the way you describe but a shadow mask inside the picture tube will act exactly that way.

Dec 02, 2012 | Combination Televisions

1 Answer

Thin white horizontal line across otherwise black screen


CAUTION: To prevent damage to the CRT phosphors, immediately turn down the brightness so the line is just barely visible. If the user controls do not have enough range, you will have to locate and adjust the master brightness or screen/G2 pots.

A single horizontal line means that you have lost vertical deflection. High voltage is most likely fine since there is something on the screen.

This could be due to:

Dirty service switch contacts. There is often a small switch located inside on the main board or perhaps accessible from the back. This is used during setup to set the color background levels. (On some sets, this is located on the CRT neck board and may be a jumper plug or other means of selecting service mode - not an actual switch.)

When moved to the 'service' position, it kills vertical deflection and video to the CRT. If the switch somehow changed position or got dirty or corroded contacts, you will have this symptom. Flip the switch back and forth a couple of times. If there is some change, then replace, clean, resolder, or even bypass it as appropriate.

Bad connection to deflection yoke or other parts in vertical output circuit. Bad connections are common in TVs and monitors. Check around the pins of large components like transformers, power transistors and resistors, or connectors for hairline cracks in the solder. Reseat internal connectors. Check particularly around the connector to the deflection yoke on the CRT.

Bad vertical deflection IC or transistor. You will probably need the service manual for this and the following. However, if the vertical deflection is done with an IC, the ECG Semiconductor Master Substitution guide may have its pinout which may be enough to test it with a scope.

Other bad parts in vertical deflection circuit though there are not that many parts that would kill the deflection entirely.

Loss of power to vertical deflection circuits. Check for blown fusable resistors/fuses and bad connections.

Loss of vertical oscillator or vertical drive signals.

The most likely possibilities are in the deflection output stage or bad connections to the yoke.
Hope it works well...

May 28, 2010 | Akai CFTD2083 20 in. TV/VCR/DVD Combo

2 Answers

Thin line horizontally across screen

First of all this set is a CRT based set and thus has what is called a Vertical IC. This is the component that either has failed or has bad connections to the PC board. This is a simple and inexpensive repair. If you are comfortable working inside he set and can solder, you can fix this yourself. First look for the vertical IC. Is will be a small flat IC attached to a heatsink and will be marked TAxxx or LAxxx. Try resoldering the pins first. If that failes to resolve the problem, replace the IC.

If you are not sure whether or not you have the correct IC, post the marking here and I will confirm.


Sep 12, 2009 | Combination Televisions

1 Answer

Black Box on screen

By your description it sounds as though the closed captioning option has been turned on on the TV. Only certain programs are CC capable and that accounts for the box moving from channel to channel as some broadcasts are not CC CAPABLE. Go to the menu on the tv and ensure closed captioning is disabled. This should resolve the issue. If you need more help please let me know.

Oct 06, 2008 | Toshiba MD20F51 20 in. TV/DVD Combo

1 Answer

At the top of Viewing screen

I would suspect that the vertical output transistor is getting ready to go.

Sep 23, 2008 | Toshiba MW27F51 27 in. TV/VCR/DVD Combo

1 Answer

Panasonic Triple Play Model PV-DM2799

Since it works then fails it sound like a simple cold solder joint. All TV's can have this problem and it is a simple one, Solder will heat up and cool down at different temperatures, this will cause a small ring fracture at the connection, simply re soldering this will fix your problem.

Feb 20, 2008 | Panasonic PV-DM2799 27 in. TV/VCR/DVD...

1 Answer

White horizontal lines at top of picture

Yes, definitely worth fixing. The problem lies in the vertical deflection voltage-doubler circuit. The usual fault is a single capacitor of 100uF/35V that has failed. It is normally connected to a rectifier diode right at the vertical IC. Replacing the capacitor (no more than USD4.00 in price) usually gets it working perfectly again. If you are finicky around technical work, then a reputable local repair shop in your locality should do it quickly for you and charge only labour.

Jan 17, 2008 | Toshiba MD24FP1 24 in. TV/DVD Combo

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