Question about RCA 20F420T 20" TV

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Which IC chip controls Horizontal oscilation in a RCA 20F420T

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6ya6ya
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Posted on Jan 02, 2017

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johnnydiode
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SOURCE: need a instructions manuals for RCA 20in 20f420t

Look for Product Manualswww.Product-Manuals.best-price.com

Posted on Oct 14, 2009

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MNfisherman
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SOURCE: 20f420t wont turn on, rca tv

power supply aka high-voltage transformer is bad.

Posted on Mar 23, 2010

Raditronic
  • 196 Answers

SOURCE: FPA block on RCA 20F420T, no controller

the only way to reset is with a remote control.

Posted on Apr 21, 2010

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1 Answer

Where is horizontal output ic in my t.v?


There is no horizontal oscillator IC. The horizontal oscillation is generated and outputted by the main system control IC LA76810 itself. Refer some circuit diagrams using LA76810 to get more details about the horizontal oscillation output from the IC. Measure the frequency at that output pin. It should be some ever near 15.62KHz.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Type in the IC number, in the search box [at the top right] of the display window, and press enter to get all related posts. It will make surf easy.

Jan 31, 2015 | Televison & Video

1 Answer

RCA 20F420T turns on, and then turns off and on and sometimes keeps scanning for channels. Is it fixable, or should I toss it?


Hello
Its "Memory" IC has damaged. This IC can be located very near to the main system IC, will be a small one with 8 solder terminals. All the data we enter to TV is stored in its memory cells [memory locations], and retrived from it to main system IC as and when needed. Eventhough it is very small and very cheap to buy, its function inside the TV is great. This IC otherwise called as [EEPROM]. Just replace it. It will have a number printed on it; it is very important to note when you replace it. Insist on same number, otherwise the TV won't even switch ON. It can be had from most of the electronic sparepart shops at your town. OK.

Jul 13, 2011 | RCA 20F420T 20" TV

1 Answer

On_Off light blinks three times but power will not come on.


Hello
Your tVs horizontal output and oscillator has some trouble with it. When the power supply gets ON, the horizontal frequency that drives the horzontal output section won't generate the horizontal frequency, that output section wont' work, the main system control microcomputer IC will sense this situation, and give shut off signal to the power supply. That is happening now with your tV.
A through checking on the main board should be done to detect this fault. you must have sound knowledge in electronics, how the TV works. Also must have all testing equipments with you including a high quality digital multimeter. Normally this fault occurs due the main chorma-video jungle IC. But before replacing it, you have to check all other components in it. Some loose soldering contacts may also make this problem.
If you have the ability and skill, Inform me. I'll assist you. OK.

Jun 27, 2011 | RCA 32F530T 32" TV

1 Answer

MY R.C.A. MODEL 20F420T WILL NOT STAY ON. TURN IT ON IT MAY STAY ON 3 SECONDS TURNS IT SELF OFF TRY AGAIN IT MAY STAY ON 2 SECONDS BACK OFF THANK YOU ????


The first couple of seconds of operation, most TVs are doing some self-test and if something has failed making full power on dangerous (for fire) they will shut down. Either a major component in the horizontal section has failed or the main power supply itself is defective.

Dec 05, 2010 | RCA 20F420T 20" TV

1 Answer

Horizontal hold needs an ajustment


Hello
Horizontal rolling is your problem I thinks. In modern TVs there is no horizontal hold control like they wer in old one. All the adjustments are digital, that is related to a very accurate crystal oscillator frequency, and its cound downs. Therefore if your TV is not so old, its main Ic may be faulty, or horizontal synchronisation pulse does not reach the appropriate pin of that Ic. First check it, and if it is ok, replace the Ic.

Oct 18, 2010 | Durabrand DU1301 TV

1 Answer

FPA block on RCA 20F420T, no controller


the only way to reset is with a remote control.

Apr 20, 2010 | RCA Televison & Video

1 Answer

Nec pf-68v21 pwr led flashing red green after horizontal output


check the supply at horizontal driver trans former ,if voltage is correct at ho/driver trasistor ...then check allthe fusible resistances from power supply,,,if tv is taking h/oscillation for awhile ,,give more screen control in lot,,, & see for a horizontal line ,,,before tv becomes off,,, if so vertical ic problem...

Mar 16, 2010 | Televison & Video

2 Answers

RCA 27 in has white horizontal line going through the middle


this symptons is caused by a breakdown in the vertical deflection circuit. hence, the trouble may be in the vertical oscillator, amplifier or output circuit. in most modern tv the vertical ic is usually composed of these said circuit inside. the ic have many pins, standing on a heat sink and smaller in size. try to check also the capacitors surrounding it. sometimes leaky capacitor may cause this problem. good luck!

Aug 16, 2009 | RCA TruFlat 27F520T 27" TV

1 Answer

Oscillator out. No radio and clock is locked up


could be a 555 ic. 555 is the widest used timer ic or "clock" chip. you will need to check the gates of this ic.

May 06, 2009 | Car Audio & Video

1 Answer

Help me to fix the TV


Try to inspect for a loosed connection in the printed circuit board especially in the horizontal circuit. This includes the ic for horizontal oscillator, transistor for horizontal driver, horizontal output transistor and the high voltage section which includes the flyback. Pls. observe safety when dealing with these ciruits coz it deals with high voltage! Good luck!!

Apr 22, 2008 | RCA 27F650T 27" TV

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