Question about RCA P56923BL 56" Rear Projection Television

1 Answer

CHERPING AND NOT COMING ON ON AN P56923BL

I HAVE REPLACED THE Horizontal Output transistor IT DIDNT MAKE A DIFFERANCE I CAN HEAT THE BORD BY THE TRANSISTOR AND THE TV WILL COME ON AND WORK INTELL I TAKE THE HEAT AWAY WHAT COULD BE THE PROBLEM

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 2,920 Answers

The transister is a bad one...

Posted on Dec 06, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Picture on Samsung TXL2791F gets smaller after a few minuets


The horizontal output transistor that drives the flyback transformer overheats now. There might be other reasons too for this fault. If the flyback transformer has any internal winding short, this transistor will overheat.
Just replace the horizontal output transistor. Check its heat. If the newly replaced transistor too overheats, replace the flyback transformer.

May 24, 2012 | Samsung TXL2791F 27" TV

1 Answer

Will not come on. light blinks 6 times


Hello
Six blinks denotes the absense of horizontal sweep. Check the horizontal output transistor, whcih can be located very near to the LOT [Line Output Transformer]; for short. If it is shorted, LOT must be suspected. Replace the line output transistor with a new one, and switch ON the tv for a short period of time, say 6 seconds or so, and check the heat of the replaced transistor. If it overheats within this time, be sure that LOT is damaged; shorted inside; and should be replaced with same type and number. If a digital multimeter which can measure frequency is available, take the frequency at the collector of the horizontal driver transistor. It should come around 15525Hz. If not replace the jungle IC. OK.

Jun 19, 2011 | Sony FD Trinitron KV-32HV600 32" TV

1 Answer

When i turn on horizontal output tripping. B+ and low voltage ok


Hello
Check the LOT and Horizontal Output Transistor. If horizontal output transistor get shorted [collector to emitter or collector to base], this kind of fault will occur. Here there is nocollector to emitter short as B+ is ok. Check for collector to base leak. It is best to repalce the horizontal transistor with a new one, and switch on the Tv for a short while, say 10 seconds or so, and feel the heat of the replaced transistor. If it gets overheated, of LOT makes a whisiling of hissing sound, LOT is faulty, and shoul be replaced sith same type and number. OK.

Apr 17, 2011 | Sony PVM-14N6U TV

1 Answer

Screen horizondally pulled right side and screen rolled to left side


hi,
your monitors horizontal deflection side have some problem. you have to check the horizontal width cotrolling transistor mounded on the aluminum heatsik near the lot( line output transistor). also check the three mosfets which adjust the width for different resolutions. there are three such mosfets in the horizontal section.

fist of all replace the width controlling transistor in the heat sink. photo of mosfet and transistor is added for reference. not the exact number.
ok
ajin_g_29.gif
ajin_g_30.gif

Jan 27, 2011 | AcerView 99C 19" CRT Monitor

1 Answer

Power ok but not eht function


Hello

If you have tested the secondary section of the SMPS power supply of your Sony TV, amd found it OK I thinks, and posts this solution.

If the secondary supply rail 125VDC is found ok, just goto to the Horizontal Output Transformer, a small transformer diretly soldered on tho the main board, very near to the Line Output Transformer [LOT], and its secondary winding is connected to the base of the line output transistor, which in turn drives the LOT said above, generates EHT you described.
The base of the line output transitor must get appropriate frequency to switch on and off. This frequenct is gerally comes to 15625Hz. Just measure the voltage across the primary winding of the above said line driver transformer, which can be a possiblity open winding. Check the voltage at the collector point of the line drive transitor connected ti the one end of the primary winding is easy. Then check the voltage at the other end of that winding. There must be a little difference of 2VDC or so, if the line drive section is working, and fault is after that section, that is line output section. If you have a digital multimeter capable of measuring frequency, measure the frequency of the collector point of line drive transtor, and find out whether there is 15625Hz or near to this frequency comming out. Never touch the multimeter prob to the collector of Horizontal Outout Transistor, while it is working. Your meter will get damaged.
Line output section, contains tha LOT said above and line output transitor. If the Line Output Transistor has some sort of leak, normally collector to base leak, it will not drive the LOT to produce EHT and it wlii heat up also.
Just check it heat effect, after switching the set on for a short period of time, say 30 seconds ro so. If it heats up abnormally, suspect the line output transistor and LOT. You just replace the line output transistor first, with same type and number. If it doesn't retify your problem, LOT said abve is faulty, and it also should be replaced with same type and number.
If you have to replace the horizontal output transistor, and the LOT said abve, insist on orginal, and not replace it with a susbstityution, as these are critical components in all TVs..
If you need further assistance, get me through Fixya, and be free to conact me. Ok

Nov 29, 2010 | Sony KV-XA21M61 21" TV

1 Answer

Hi My toshiba CX36H60 has a problem -- no picture but sound is good. what could be the issue and how to rectify it. Please suggest.


As sound output is ok, main board is correct with respect to sound output, video IF and ther stages. The fault lies on the horizontal output section. It may be LOT fault. Check it further for horizontal oscillator stage, and horizontal output stage. Check the collector voltage at the horizontal driver transistor. If you have a frequency meter, check the frequency of that point. It should be somewhere near 15625Hz. If the frequency there is Ok, then proceed to horizontal output stage. Check the horizontal output transistor. If it seems to be faulty, replace it with similar type and number. If the replaced horizontal output transistor heats abnormally within seconds after swich on the set, surely LOT has troubel. Replace it also with same model mumber and type.

Oct 16, 2010 | Toshiba CX36H60 TV

1 Answer

What is the problem if only retrace line appears on screen and without picture output? what circuit has a problem if b+ voltage increases up to 150vdc and it kills the horizontal output transistor...


1. Check the opto coupler in the SMPS circuit. Replace it with
new one. DO NOT SWITCH ON TV WITHOUT OPTO COUPLER.
This is feed back, to the switching transistor to control the oscillator.
2. Horizontal out put transistor going defective.

This is due the failure of diode near the EHT coil primary and
the transistor. The reverse leakage of the high voltage diode can not be
checked by the meter. Hence replace all the black coloured diodes
in the horizontal deflection circuit diodes with identical part no.
Horizontal out put TR will get over heated and will rupture. When you
replace with new transistor switch on TV and switch off immediately.
The heat sink should not get heated or warm up. This is the only way
you can protect the transistor when you replace other components one
by one.

After checking all the small components, finally EHT coil.



p

Aug 19, 2010 | Televison & Video

1 Answer

Rca model 20f51otd no pwer but hear a cherp every 2 seconds.


Chirping sound is usaly a horizontal issue, either the flyback transformer the horizontal output transistor is shorted. This repair takes some expertiese and a multi-meter. Soldering skills are a must. This can be an involved repair if you never worked on a tv before.

Sep 01, 2009 | RCA 20F510TD 20 in. TV/DVD Combo

1 Answer

Rca p56923bl chirping


Horizontal Output transistor looks like this attached to a heat sink near the Flyback transformer97bd027.jpg

Nov 28, 2008 | RCA P56923BL 56" Rear Projection...

1 Answer

Philips projection 51pw9363


The chirping is usually related to the horizontal output transistor or the flyback transformer or both. Let me know if you need further assistance.

Jul 21, 2008 | Philips 51PW9363 51" Rear Projection...

Not finding what you are looking for?
Televison & Video Logo

Related Topics:

40 people viewed this question

Ask a Question

Usually answered in minutes!

Top RCA Televison & Video Experts

The Knight
The Knight

Level 3 Expert

72216 Answers

matt martin
matt martin

Level 3 Expert

1207 Answers

Jaime Hernandez

Level 3 Expert

2296 Answers

Are you a RCA Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...