Question about RCA F36650 36" TV

1 Answer

Horizontal line The tv just started this maybe 4 months ago. The screen will flicker and you can hear an extremely high pitch whine. From top to bottom of the screen, the 1st 5" or so is fine then the next 3-6" of the picture compress into a single bright horizontal line, and the last of the picture looks fine but it is about 3-6" higher which leaves a large black area at the very bottom. The tv seems to discharge alot of static following unplugging it. So much in fact that I have been painfully shocked when accidentally placing my hand on the tube while I had the plug in my hand. (part of my finger was touching the prongs of the plug) What could this be?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert whose answer got voted for 500 times.

  • Master
  • 2,267 Answers
Re: horizontal line

It looks like the squeal or high pitch is produced by the flyback part # 257805. Also check the the secondary side of the power supply for around 130VDC if that voltage is found to be lower than 120VDC I would suggest to replace CP80 with a 100 mfd@250 vdc. Part # 218374 has these parts, for the flyback transformer just type in search for FLY-391, this one is cheaper than the genuine(257805) fly back.
Good Luck.

Posted on Jan 17, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

No Picture or sound


The screen is blank with no raster at all. There are indications that the channel numbers are changing in the display. This indicates that some of the low voltages are present but these may be derived from the standby supply.

Assuming there is no deflection and no HV, you either have a low voltage power supply problem, bad startup circuit, or bad horizontal output transistor (HOT) or other bad parts in the horizontal deflection.

Check for bad fuses.

(If you have HV as indicated by static electricity on the front of the screen and you hear the high pitched whine of the horizontal deflection when it is turned on, then the following does not apply).

Use an ohmmeter to test the HOT for shorts. If it is bad, look for open fusable resistors or other fuses you did not catch.

Assuming it is good, measure the voltage on the collector-emitter of the HOT (this is safe if there is no deflection). You should see the B+ - probably between 100 and 150 V.

If there is no voltage, you have a low voltage power supply problem and/or you have not found all the bad/open parts.

If there is voltage and no deflection (no high pitched whine and no HV), you probably have a startup problem - all TVs need some kind of circuit to kick start the horizontal deflection until the auxiliary power outputs of the flyback are available. Some Zeniths use a simple multivibrator for this - a couple of transistors. Others power the horizontal osc. IC from a special line-derived voltage. The multivibrator type are sometimes designed to fail if someone keeps turning the set on and off (like kids playing) since the power rating is inadequate.

Test the transistors if it is that type with an ohmmeter. If one is shorted, you have a problem. The usual way a TV service person would test for startup problems is to inject a signal to the base of the HOT of about 15.75 kHz. If the TV then starts and runs once this signal is removed, the diagnosis is confirmed. This is risky - you can blow things up if not careful (including yourself). See the section: Bypassing the Startup Circuit for details.

If you hear the high pitched whine of the deflection and/or feel some static on the scree, confirm that the horizontal deflection and high voltage are working by adjusting the SCREEN control (probably on the flyback). If you can get a raster then your problem is probably in the video or chroma circuits, not the deflection or high voltage.
Good luck...

May 29, 2010 | Sony KV-32HS20 32" TV

1 Answer

Makes a high pitch "chirping" sound when I try to turn it on

if its a hi pitched whine it could be the horizontal output xfmr make sure all solder joints around the xfmr are solid and the xfmr mounts are tight it sounds as if your hearing the 15,750 hz. horiz. signal

Sep 17, 2009 | RCA F36650 36" TV

1 Answer

RECOR COLOR TV dead high pitch whining noise

you have a short in the horizontal ckt,look for diodes,horizontal output it might be damage or a bad cap, if not the fly-back transformer is gone.

good luck

Oct 20, 2008 | RCA F32650 32" TV

1 Answer

RCA F32650 32" White lines with hazy white flickering

Absolutely right about the transistor and also check any adjacent resistors to the transformer and to the line output transistor. Good luck.

Sep 19, 2008 | RCA F32650 32" TV

2 Answers

High pich whine from CT-36D32 36" TV

jdosk-the high pitch noise you hear is generally from the horizontal output being shorted,the horizontal output is usually near the flyback transformer,get a digital multimeter to checkthis part.Let me know I'll try to help. cooltek Feb.16/08

Feb 05, 2008 | Panasonic CT-36D32 36" TV

1 Answer

Will not power up

your problem is in flyback or high voltage section failure.

  • check horizontal output transistor
  • check fly back transformer.
  • check for supply to horizontal section as high voltage from power supply may create such problem
  • as this failure is due high voltage section so it is better to take skilled technician help.
  • good luck.

Oct 15, 2007 | Toshiba 27A51 27" TV

1 Answer

27 inch tube tv won't stay on

You have a problem is in your horizontal section which also is part of your power supply. The high pitched whine is from the Intergrated High voltage transformer (also called the flyback transformer). This sound occurs when the freuency of the transformer changes and or the voltage gets too high. The click occurs as a result of the drawing of excessive current by the HOT Horizontal output transistor. This is repairable, but requires the correct equipment and a schematic.

Sep 19, 2007 | Philips Magnavox 27MS343S 27" TV

1 Answer

32 in RCA MODEL NUMBER f32650

TV FINE UNTIL 2 NIGHTS AGO HAVE HAD 4 YEARS, STARTED HAVING A FOGGY SCREEN WITH WHITE HORIZONTAL LINES. HAS SOUND A FOGGY SCREEN WITH WHITE HORIZONTAL LINES. called retrace lines please check 1 screen control on eht transformer is mituned 2 supply to screen of crt 3 supply to rgb video output is absent 4 connector loose 5 crt base loose thanks

Sep 11, 2007 | RCA F32650 32" TV

1 Answer

Black screen, high pitched squeal

A set that has only a 1/2 inch bright line through the middle of the picture, from left to right, has a vertical output IC that is not working correctly. If the 1/2 inch line is in the middle but going up and down, then the horizontal yoke circuit has stopped working. These are problems which should be looked at by a qualified tech, but if the set was purchased 6 months ago then it should still be under the manufacturer's warranty.

Aug 29, 2007 | Philips Magnavox 20MT4405 20" TV

1 Answer

TV won't stay turned on, no picture, started making high pitched noise

That high pitched noise you're hearing is the power supply telling you that it has too much of a load on it and lowered its operating frequency which in effect cuts its output way down! Normally you don't hear any thing since the power supply operates at a frequency that's beyond human hearing. In an RCA this indicates more than likely that your horizontal output transistor is shorted and this short was caused by the flyback transformer shorting. This is a common happening with RCA's You'd need to take to a tv shop and have it checked out. Stargazer

Jan 28, 2007 | RCA F27650 27" TV

Not finding what you are looking for?
RCA F36650 36" TV Logo

81 people viewed this question

Ask a Question

Usually answered in minutes!

Top RCA Standard (CRT) Televisions Experts

The Knight
The Knight

Level 3 Expert

66685 Answers

John mullen

Level 2 Expert

229 Answers


Level 3 Expert

2963 Answers

Are you a RCA Standard (CRT) Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides