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Tv not switching on just makin noise from power supply & hissing @ the flyback transformer with horizontal becoming extremly hot then afew min later horizontal burns out(D1398)

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If the horizontal transistor getting shorted, this could happen.
Check the transistor 2 SD1398. If found faulty replace it.
But replace black colored doides in the circuit as a whole.
Leaky diodes can not be determined easily with the multi meter.
Especialy the small high voltage diode near the small transformer
connected to the 2 SD1368 transistor.

Posted on Sep 03, 2010

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I have a Panasonic CT-36hL43G TV that just turned offf while watching it and now the led by the power button blinks one time. Can anyone tell me what this code means or what the problem might be?


i hope your tv is more than 4years old ....... in all CRT TV's or CRT monitors after 4years a component called flyback transformer (see picture ) becomes weak - its work is to supply voltage to tube............. then following are the signs ...
(1) in some TV's only front LED's blinks - no picture no sound.... (2) in some TV's picture comes slowly after few seconds or after few mins or after few hours......... (3) in some TV's suddenly picture & sound goes temporarly & after some time again it appears ...... etc in case of (2) & (3) only flyback transformer needs to be replaced .....100% GUARANTEE again TV works normallyBUT in case of (1)... --------------- YOUR CASE (a) either only flyback transformer gets deffective or (b) flyback transformer & another component called transister ( will be near flyback transformer & its back portion is attached to aluminium metal ) gets defective or (c) along with flyback & transistor -- 3 or 4 more components (resistors, diodes, some times ICs ) gets deffective so replacing flyback transistor is a must .. & to find whether any other component is deffective or not completemainboard has to be checked ....... so if you are a technical person & having expierence in servicing line then you can do it yourself otherwise approach good tv service engineer ........... your TV is really very good one ... so don't think of buying new TV .... just goahead for repairing it it is worth & it works for atleast 2 more yrs....... try this & tell me what happened switch off your TV ... remove power cord from socket ,,,,.ware some mat or chapples to your feet ..... remove your TV's back side cover ......... observe carefully for any physically damaged components .... if you find then don't do anything ... close tv cover & approach tv service engineer ............. but if no physically damaged components are visible then take a suitable screew driver & rotate 2 (or 3) Knobs on flyback transformer in clockwise or anticlockwise direction - very little ( 4 or 5 degrees ) - you have to do this without touching any cable or any part of your tv .......... then fix..... back side TV cover ........connect power cord - stay at a distance & switch on your tv ......... if you get picture atleast for few seconds then in your case only flyback transformer needs to be replaced otherwise complete mainboard has to be checked. to find other deffective component ............. so your tv problem is a harware problem - it cannot be solved using remote control or any buttons on your tv ..... if you are finding difficult to get it repaired then you can remove your tv mainboard with the help of some technician & send to me ...... i will replace deffective components .... & send back to you ....you only have to bare the shipping charges .....it will take maximum 12days (5days - to recieve + 2 days servicing + 5 days to send back to you )....



8_16_2011_10_00_55_pm.jpg

Aug 16, 2011 | Panasonic CT-36HL43 36" TV

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The tv is froze and makes squeaking noises, wth? Oh by the way it is a Westinghouse


First, make sure it is not coming from the loudspeaker itself. If it is, then we are looking at an unusual electronic interference problem rather than simply mechanical vibration.

In most cases, this sound, while annoying, does not indicate an impending failure (at least not to the set - perhaps to your mental health) or signify anything about the expected reliability of the set though this is not always the case. Intermittent or poor connections in the deflection or power supply subsystems can also result in similar sounds. However, it is more likely that some part is just vibrating in response to a high frequency electric current.

There are several parts inside the TV that can potentially make this noise. These include the horizontal flyback transformer, deflection yoke, other transformers, even ferrite beads in the horizontal deflection circuits. In addition, transformers or chokes in the switching power supply if this is distinct from the horizontal deflection circuitry. Or even a portion of the sheetmetal used for shielding if in close proximity to a magnetic component
If you are desperate and want to check the inside of the set:


Using appropriate safety precautions, you can try prodding the various suspect parts (flyback, deflection yoke, other transformers), even lowly ferrite beads, with an insulated tool such as a dry wooden stick. Listen through a cardboard tube to try to localizing the source. If the sounds changes, you know what part to go after.

Once you have located the guilty party, some careful repositioning, a strategically wedged wooden toothpick, or a dab of RTV silicone or hot-melt glue may keep it quiet. Where the yoke is the guilty party, see the section: Reducing/eliminating yoke noise.

It is possible to coat the flyback transformer, but this is used mostly when there a loose core or windings and you are getting not only the 15,735 Hz horizontal (NTSC) but also various subharmonics of this. This is probably acceptable but may increase the temperature of the flyback.

A replacement flyback (or whatever part) may cure the problem unless it is a design flaw or manufacturing quality problem. However, the replacement part could be noisier. You really do not want to replace the yoke (aside from the cost) as convergence and other service adjustments would need to be performed. Other transformers can be replaced.
Hope this sheds a little light on the problem
You do not have other speakers right next to the tv??

NOTE: IF YOU DO NOT HAVE ANY ELECTRONIC EXPERIENCE THEN GET SOMEBODY WHO HAS EXPERIENCE WITH TVs TO DO THIS. THER IS 32000 VOLTS INSIDE THIS TV AND IS DANGEROUS WHEN THE BACK IS TAKEN OFF. THE RED CUP ON THE BACK OF THE TELEVISION TUBE WITH RED WIRE ATTACHED HOLDS THIS CHARGE - KEEP KEEP AWAY FROM THIS

Feb 01, 2011 | Televison & Video

1 Answer

There is a hissing noise in back of tv and picture goes on and off zenith d36d51


Hissing noise and picture on and off means faulty flyback transformer, it has a small crack and voltage is leaking out, replace the flyback, if tv still not working replace horizontal output transistor (broken flyback could blow the transistor).

Aug 09, 2009 | Zenith D36D51 36" TV

1 Answer

The tv willnot power up .the light keeps flashing and huming


Check the horizontal output transistor (H.O.T.) next to the flyback transformer. If it is shorted, the switching supply won't turn on.

Dec 05, 2008 | Samsung HCP4252W 42" Rear Projection...

1 Answer

Hyundai 14" colored tv no power


if the final flyback is ok ,then check the driver transistor and the voltage in his collector .Probably the flyback transformer is ok.please reply.

Oct 17, 2008 | Sharp 25R-S100 25" TV

1 Answer

RCA 31" TV pakes high pitched chirping noise


Did you check the Horizontal Output transistor to see if it were shorted, and also check the MOSFET of the switching power supply. 

Jul 25, 2008 | Televison & Video

1 Answer

No power.


Usually, in those Sony sets, a crack developes on a small transformer in the horizontal drive circuit, which causes the horizontal output transistor to short. This immediately shorts out the switching transistors in the power supply and blows the Sony 0.1 ohm resistor fuse. A shorted flyback (high voltage) transformer will also have the same result. The power supply does NOT need to be replaced. The parts should be replaced, the flyback checked and the board resoldered by a qualified tech familiar with Sony sets.

Aug 23, 2007 | Sony KV-32V35 TV

1 Answer

RCA F27669 27"


The F27669 uses the CTC203 series chassis. The most common cause of that symptom is a shorted horizontal output transistor, caused by a cracked solder joint on a small coil connected to that transistor's base. When this happens, the main B+ supply is shorted to ground so the power supply squeels. Every once in a while I also see the horizontal output transistor shorted due to a shorted flyback (high voltage) transformer. A good tech will replace the horizontal output transistor, resolder the coil and drive transformer, test the flyback (replacing it if necessary) and your set will be back to perfect.

Aug 08, 2007 | RCA 27V570T 27" TV

2 Answers

56" RCA projection TV (FLYBACK related problem)


the base to emitter of the hot will read short on a diode checker/test on ohms it vairies but typically about 50 ohms.e to c, or b to c should have very high resistance. unsolder the collector of the hot. make sure all solder is gone. now test the ohm between your tuner ground & the pad of the hot collector it should read open.

Jan 16, 2007 | RCA P52921 52" Rear Projection Television

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