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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Re: Burned resistor in vertical yoke circuit. Pix displays vertical foldover - RCA F36650 36" TV Standard (CRT) Televisions

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 Standard (CRT) Televisions

2 Answers

Videocon bazoomba tv circuit diagram

If it shows picture at first, and after some time displays a vertical line at the center of the screen, check the connector that goes to deflection yoke for loose connection at its bard end socket, and check all the solder terminals of capacitors at horizontal output section. If you wish to get some details, Pull up older posts.

Dec 14, 2013 | Standard (CRT) Televisions

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 | Standard (CRT) Televisions

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 | Standard (CRT) Televisions

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

I need to find the pincushion circuit on my RCA F32632SB TV to check a problem with the TV displaying an hour glass picture. Where can I find a picture of this or a manual to guide me to the circuit?

The pincushion it intimately related to the horizontal circuits,the electron beam must travel farther to reach the corners of the crt and it does to the middle and so without pincushion circuits the raster would be bowed in on the sides on crts 27 inches are larger.Pincushion corrections straightens the raster by modulating the horizontal yoke current at a vertical rate.In an RCA tv the pincushion circuits are usually numbered 4800and the pin amp will probably be numbered 4801,its drive transistor should be Q4802,R4802 will be the width control,and R4805 the e/w pin amplitude. its inputs from the vertical should be Q4801 (subtractor) Q4803 (buffer) you should have a parabola waveform at 4801,yoke current can be modulated here without effecting high voltage.when Q4802 conducts voltage should decrease across Q4801 and the voltage drop across the yoke increases. The east west pin amp control 4805 controls how much of the vertical parabola is input to U4801 to compensate for changes in width caused by variations in beam current.By varying the e/w control resistor you can know if the circuit fault is in the input or output,if the picture varies in size the fault is in the input to U4801,if it does not vary check the output or U4801......hope that helps

Jan 15, 2009 | RCA F32632SB 32" TV

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

4 Answers

Thin horizontal line

Defective components in vertical deflection and output circuit inclusive of vertical output device, coupling capacitors, and yoke connectors. Passive devices such as electrolytic capacitors, coils, and resistors to/from power supply circuits. If your tele is more than 10 years old dump it and get a newer product. $100 USD is a fair price to diagnose and attempt service, depending on age and configuration. Older products may not have replacment parts available at any repair cost. There may be a pot for adjusting the vertical size. If so, it may be dirty. If you can find it, try adjusting it which could clean it. BE CAREFUL -voltages are very high.

Mar 20, 2006 | Sharp 27H-S60 TV

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