Question about RCA F36450 36" TV

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Horizontal size The horizontal size on the screen needs to be adjusted, How do I accompliosh this. I have the Howard Sams photofact service manual # 4825 and it has some miscellaneous adjustments one is called the horizonal size so I entered into the servive menu and adjusted that particular setting and it did not affect the picture at all. Does the horizontal size have something to do with the Gemstar 4 module? could it be defective?

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  • 93 Answers

Did u try adjusting the flyback transformer

Posted on Nov 01, 2007


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Which service manual setting controls horizontal size?

You're discussing about the factory mode adjustments. The horizontal width adjustments will not be there. You have to adjust it by replacing certain capacitors at the horizontal output stage.

May 18, 2013 | Panasonic CT-20G6 20" TV

1 Answer

Flyback no. 25gt539

Try Suburban Electronics as they sell generic replacements for these older RCA and GE sets---If you need the part number look for a Howard W. Sams Photofact for this set, has schematics and a complete parts list included.

Dec 13, 2012 | GE 25GT539 25" TV

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RCA 20F514TD has lost horizontal hold. How can I adjust this? I have found no button or menu option discussed in the manual or by searching.

Horizontal rolling is the fault to your TV I assumes. It is a circuit fault. It can't be adjusted by customer controls. Contact any experienced service technician.

Nov 26, 2012 | RCA Televison & Video

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Schematic diagram for sanyo tv AVM-2979P

Only two choices here aside from Google the model number with "service manual" is to contact Sanyo or look to see if the set is covered by a Howard W. Sams photofact manual.

May 15, 2012 | Sanyo AVM-2509S TV

1 Answer

Samsung txe2546, how to adjust horizontal size. I went on the service mode but there is no adjustement for horizontal size. How can I adjust it, because the image is larger than the screen... Thank you...

Hello Laurent
This is pretty easy it's like when you adjust the imgae on your pc monitor, go to the menu then go to settings, select video or image, look for the option and just change it there.

Jul 08, 2009 | Samsung TXE2546 25" TV

6 Answers

Monitor problem


Appreciate the "Ask Me".

I am assuming that you have more than just familiarity with electronic components and circuitry, the use of a DVM and a soldering iron. Further, that you have access to a service manual.

Width problem is basically insufficient horizontal deflection, then analysis would have to be in the horizontal section. Areas to initially focus on:
  1. 12V line and pin 29 of IC401;
  2. 110 V peak to peak at collector of Q403, if yes check Q 402 & 404 as well as T401;
  3. other components that affect the horizontal size are:
  • IC201
  • Q 405, 406, 407 & 408;
  • D409
  • L401
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 06, 2008 | Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

Colors won't stay set

NOTE: Manual Convergence settings ARE LOST if the customer returns to AUTO Magic Focus mode. (More Details) this situation is normal. Bottom line: This is caused by two issues, The Centering is off of any or all CRTs. (Don't forget Red and Blue Offset values). The Horizontal Size needs to be changed by increasing H. Size by 20mm. Readjust the Horizontal Size to the NEW specifications. These are different that the original Service Manual. They have been increased by 20mm on 51", 57" and by 25mm on the 65". Before replacing DCUs, Please CHECK and confirm if any of the three color center alignments are off and readjust the Horizontal Size to the New specifications.. TO CHECK. Clear DCU data by holding down the DCAM "Service Only Switch" and then POWER. Make sure the Green is centered. Make sure the Red and Blue is offset from center with respective offset value according to the SM information. Readjust the Horizontal Size to the NEW specifications. These are different that the original Service Manual. They have been increased by 20mm on the 51" and the 57" and on the 65" it's increased by 25mm. There IS NO NEED to replace DCUs. The DCUs are not defective...All that is needed is to confirm the Centering Adjustment for the three colors and adjust the Horizontal Size to the NEW specifications. Adjust if any color is found to be out of adjustment specifications. If you don't understand this then you need live chat!

Sep 11, 2007 | Hitachi 43F300 43" Rear Projection...

2 Answers

I want to collect tv schematic diagrams. can u tell me where can i get them?

You can simply do a search online for anything. Start with Howard W. Sams AKA sams photofacts, Http://service, and go to almost any manuafacturer and type in the maunfactuer and downloads, ie panasonic downloads, toshiba downloads mect ect. its all for you online.. Some are free and some you will have to pay for. Good Luck with youe collecting.. Ps please dont forget to rate this thread.

Oct 17, 2006 | Philips 27MT3305 27" TV

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