Question about RCA F36650 36" TV

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Burned resistor in vertical yoke circuit. Pix displays vertical foldover

What is the value of RF09? Yoke is fed with TDA8172. RF09 is connected to vertical yoke return circuit. Looks like a feedback circuit, or flyback monitor circuit. No schematic.

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  • mexicotv Nov 23, 2007

    Thankyou very much. The original was burned beyond recognition or measurement.



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Part # 247674 2 Watt 220R

Posted on Nov 23, 2007


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On screen horazantal white line

May not be an easy fix:

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

May 27, 2014 | Samsung Televison & Video

1 Answer

Horizontal line

Basing on your post : Horizontal line ,

check vertical deflection circuits

( includes IC, capacitors , resistors % foil paths ) , up to the yoke.

Could be just a cold solder joints on Vertical IC, open resistor,

leaky capacitor or both

Have voltage :

On most the supply line of vertical IC is +24V

Aug 14, 2012 | Televison & Video

1 Answer

Dear sir i have samsung 21 inch flat television now horizontal drive transistor fails after few hours i replaced 3 times the same transistor(tt2222) but again geting fails so pls let me know what is...

You just replace the freewheeling capacitor, normally come up to a value of 5600pf 2000V or so, connected to the collector of the horizontal output transistor, fitted very close to the collector lead. Replace the yoke return capacitor, 0.33uf or so also. Usually samsung sets use no heatsink for the horizontal output transistor. You just put a small heatsink to it and check. If it doesn't overheat, you can remove it later.
You can suspect the deflection yoke also for shorted winding. To check this. pull out the CRT base board out of the neck of the picture tube, place it where it doesn't get short circuited, and unplug the deflection yoke connection from the main board, and switch on the set. See whether the transistor overheats now. If it doesn't overheat, suspect the deflection yoke for shorted turns of winding inside it. Till the transistor overheats, suspect the LOT.
NOTE: Never switch on the set while unpluging the deflection yoke connection plug from the circuit board, without dismandling the CRT base board. CRT may get damaged, with a black burned spot inside the center of the screen.

Dec 15, 2010 | Samsung CXJ1952 19 in. Combo

1 Answer

Vertical lines in the picture

Hello, This require you opening the television and having an ohmmeter to work with. This is a vertical deflection problem - possibly a bad capacitor, bad connection, flyback/pumpup diode, or other component.
If the symptoms change - particularly if they become less severe - as the set warms up, a dried up electrolytic capacitor is most likely. If they get worse, it could be a bad semiconductor. Freeze spray or a heat gun may be useful in identifying the defective component.
It is often easiest to substitute a good capacitor for each electrolytic in the vertical output circuit. Look for bad connections (particularly to the deflection yoke), then consider replacing the vertical output IC or transistor(s).
A defective deflection yoke is also possible or in rare cases, a bad yoke damping resistor (e.g., 500 ohms, may be mounted on the yoke assembly itself).
Where there is a wide running vertically on the screen the likely causes could be a missing power supply voltage, defective vertical output IC, or a component associated with it is likely bad. A bad connection or blown fusable resistor may be the cause of a missing power supply voltage.
The following are NOT possible: CRT, flyback (except possibly where it's the source for a missing voltage but this is more likely just a bad solder connection at a flyback pin), tuner (except for the famous RCA/GE/Proscan or Sony models where the controller is at fault - see the sections on these specific brands). I am just trying to think of really expensive parts that cannot possibly be at fault :-).
Note that some movies or laser karaoke discs are recorded in 'letterbox' format which at first glance looks like a squashed vertical problem. However, the picture aspect ratio will be correct and turning up the brightness will reveal a perfectly normal raster above and below the picture.

May 20, 2010 | LG 32LG40 32 in. LCD HDTV

1 Answer

Horizontal retrace lines at top of screen

Change 100uf 50-63volts capacitor next to the vertical output ic,if not solved check the vertical b+ filter on the 24volt line.If nothing else work try damping the vertical yoke with 2 300ohms resistors if in series or just one 220-330 ohm resistor if its parallel vertical yoke windings.

Nov 22, 2009 | Sharp 32J-S400 32" TV

1 Answer

Screen has a band on top part

the way that you are describing your problem it seem to be vertical foldover. this problem is in your vertical output and feedback circuits.check the vertical output transistor,ic, and yoke coupling capacitor. also check capacitors that could be out in your vertical bias and feed back circuits. an esr will do this in no time. the easiest way that i have found to check capacitors without removing them or even turning the board over is to get some alligator clamps and clamp one end to your esr and the other end to a wire and measure the cap. this way you will be able to read the cap and measure at the same time. also check resistors and transistors using the same method for hard to reach components. please rate my solution if it helped. thank you

Nov 13, 2009 | Televison & Video

1 Answer

How do you fix a white horizontal line across top of Orion TV?

Hello eatkinson,

This denotes a problem with the vertical deflection circuit. This is more then likely the result of the vertical coupling capacitor failing. You will need the schematic diagram of the TV to find the capacitor in question. it is located between the vertical output stage and the vertical deflection winding of the yoke transformer. In addition check the continuity of the vertical winding of the yoke transformer this can cause the same problem. In any event the problem is that the vertical deflection signal is not getting to the yoke transformer or the yoke transformer is malfunctioning.

I hope this helps,

Thank you,


Apr 08, 2009 | Orion1934 19" TV

1 Answer

Picture problem

Aside from the parts you mentioned check the vertical connection to the yoke (usually yellow and green wires), it may have a cracked solder joint or it could be burned. Also check the yoke for a broken vertical winding.
If the line is yellow with no other colors you may also have a bad color gun or drive transistor. If all color guns are working the line should be white.

Mar 14, 2008 | Televison & Video

1 Answer


the best and first thing is reduse brightness to avoid crt demage 1 check circuit between horl output to yoke horihontal winding 2 check h yoke connection 3 boost capacitor generally low value &high voltage

Sep 09, 2007 | Sony FD Trinitron WEGA KV-21CL10 21" TV

6 Answers

Sylvania 27" TV

This problem sounds like the vertical output circuit is bad. it could be a vertical output IC, a bad resistor in the sweep supply, a bad capacitor, or a bad solder connections. Sorry to say this is a solid state set, so if you know how to solder and know how to service solid state devices, you should have No problem finfing the bad part. if you have no experience, please be safe and call in a trainede tech to assist you. Good Luck PS please dont forget to rate this thread>

Oct 18, 2006 | Sylvania SRT4127P TV

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