Question about Sony KP-51WS520 51" Rear Projection HDTV-Ready Television

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When working on a rear projection TV, Does the flyback needs to be discharged same as an CRT?

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NEITHER usually need to be discharged, the crt's are sealed at the anode area.

SD TECH

Posted on Apr 06, 2011

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Noisy flyback transformer tcl CRT TV model 14F1


They often begin buzzing when the oil inside them gets old or evaporates from a cracked housing. It needs replacing however be very careful. Flyback have 50000 to 100000 volts in them even when the tv is off. There is a safety discharge procedure however if you are not familiar with replacing a flyback do not attempt it yourself. FLYBACK TRANSFORMERS CAN SEVERLY INJURE OR KILL YOU.

Jul 17, 2016 | Televison & Video

Tip

Diagnosing and repair of TV High Voltage problems.


Your TV is dead or perhaps the turn on relay clicks and immediately clicks again, followed by your standby light blinking a specific code. For each TV the code is different. To find out your code google "(your brand name) error codes". This should return the listing of codes for your unit. Check the code to see if it is the high voltage section with the problem.

The hardest working section of any TV is the high voltage section. This does not apply to flat screens and DLPs only CRT projection units and conventional direct view units. The flyback get hot and is made of many windings of very thin wire which is only shellaced to insulate it. Over time the windings coating breaks down and the windings short together. This can happen in as little as several years. Once shorted there is less resistance and the current being pushed through the flyback increases. This overloads the Horizontal Output Transistor which gets hot and fails. This in turn causes the low voltage power supply to detect the overload and not allow the unit to start up, giving you the error code blinks.

The flyback is generally near the rear of the unit and is cylindrical with large rubber wire or wires if projection coming out of it and going to a rubber cup on the CRT or CRTs. Near the flyback will be a large heat sink with a large transistor mounted to it. With the set unplugged check the HOT with a DMM on diode scale for resistance. The leads of the HOT should be marked on the circuit board (C= collector, B=base,E=emittter). If the HOT has 0 resistance between all the leads it is shorted and you need to replace both it and the flyback.

You should be able to obtain both parts at http://www.encompass.com or http://www.shopjimmy.com . Unsolder both parts and remove from the board. When installing the new HOT be sure to clean off the heat sink and apply new heat sink compound available from the parts supplier. The flyback also will have two additional wires to remove and replace. One goes to the CRT board and may plug into a plastic box on the CRT jack or be soldered into the board depending on the model. This process should be self explanatory if you study it a while.

Depending on whether you have a projection TV or a Direct View TV the procedure is a little different. I will describe the procedure for a direct view TV first.

The 2nd anode lead (large red rubber wire going to the CRT) is plugged into the CRT and may have 48 kilo volts on it! Discharge the potential to the ground strap (bare wire going around the CRT) using an insulated screwdriver and a wire with gator clips on each end. If the CRT was storing power there will be a spark and loud snap when you make contact. Once discharged the tube is safe. Pull back the rubber boot and remove the wire from the hole in the tube. Install the new flyback wire. Solder the new flyback to the board reassemble everything and turn on. If you were successful the unit will start. You will need to set the focus and screen drive using the two potentiometers on the back of the flyback. Top is focus, bottom screen drive. Turn up the screen drive to get a picture. Tune to a channel with text. Turn focus to get the sharpest image. Tune to a channel which has both black and white in large amounts. Turn up screen drive until the black just begins to light up or starts looking gray then back it off slightly and you should be done with the unit. Be careful while adjusting the flyback as the set will have lethal voltages in it.

Now for the flyback on a projection TV. It will have 4 large rubber wires coming out of it. If the new one came with wires they should be removed at the HV divider block (located at the front of the set normally, just follow the wires to their end) if not they should be removed at the flyback. To remove at the flyback, which is the most common hookup, slide the rubber boot off the post and using needle nose pliers pry the cable out. It should have a bare end which connects to a clip at the bottom of the new unit. Do them one at a time to avoid getting them wrong. When done you may have to adjust the focus and screen drive but it will be on a separate box called the HV divider block usually near the front of the unit behind the grill. Same process as listed above for the direct view set. If your unit still does not run you may also have to replace the HV divider block. All safety rules apply here also.

That should conclude the repair and if successful your set will work. If the unit still does not work go to my tip on troubleshooting at http://www.fixya.com/support/r4425277-basic_direct_view_tv_troubleshooting which explains the basic troubleshooting method to find any problems in standard televisions.

Thanks for using FixYa.

hardrocko

on May 23, 2010 | Televison & Video

1 Answer

I do not know how to discharge and remove de flyback of a philips 50P8341 rear projection TV in a safety way. I have tried to insert a flat screwdriver grounded into the plastic that covers the anodes of...


Yes,just don't touch or mess around with the flyback right away,when u just unplug the tv or the highvoltage of the flyback will give u a very big and heavy shock and can hurt u badly.Wait like about an hour later.Now take the lead wire from ur voltemeter used it as a tool to grounded it some where in the tv metal frame and used the other side of the lead touches around the flyback for discharges.Than just do what u want to do to the flyback now.

Apr 26, 2011 | Philips 64P8341 64" Rear Projection...

1 Answer

Cannot Find Flyback Transformer 60PP9202/17F


Contact Philips directly. They should be able to get you the part, even if they have to get it from another repair shops. Many repair shops purchase their parts from factory authorized distributors, not from the manufacturer. The flyback transformer powers the tube-it can be extremely dangerous to work on-EVEN with the tv off, they contain a lot of power somethjing like 50,000 to 150,00 volts. It is not fun getting shocked by one of these as many techs have been knocked unconcious by them. If you do not know the proper procedure to discharge a flyback then leave it alone!

Dec 22, 2009 | Philips 60PP9202 60" Rear Projection...

1 Answer

Sony kp-57ws500 flashes blue, green, red then turns off


Re-insering the flyback wire is usually very easy. Push in and give a slght turn and check to see if grabbed. It sounds as if there is more issues than flyback wire. TV should turn on without one crt connected

Dec 14, 2009 | Sony KP-57WS500 57" Rear Projection...

1 Answer

RCA D52W20 has no anode cap (Discharge how)


On end of the red wire from the flyback to the top center of your CRT (picture tube) there is an anode cap. Get a wire clip and a long screw driver that has an insulated handle. Attach one end of clip wire to known ground on TV chassis and the other end to the screwdriver. Now carefully slide tip of screwdriver under the anode cap. You should hear a little snap. Now the CRT is discharged.

Good Luck, Big Irish.

Nov 22, 2009 | RCA D52W20 52" Rear Projection HDTV-Ready...

2 Answers

When I turn on my rear projection tv the picture is fine, then all of a sudden it goes blurry, after about 45min you turn it off and then back on and the picture is fine. what could the problem be. the...


well if your tv was to be a normal tube tv, i could suggest to check your crt socket. in this case its projestion tv, so your are having three crt sockets. the main problem is with your main flyback transfomer. try to change the flyback and it should work back to normal. other way to test is try to adjust your transfomers focus, if it is adjusted, and goes blury again, then you need to change it,...and try to re-service the board...best luck

Oct 19, 2009 | Philips Magnavox 51MP392H Rear Projection...

1 Answer

Help Fixing SONY KP 46S17 Rear Projection TV


#1. is the ground witch the connector can be found most likely from the crt tube ground, the one that clip with return spring.

#2. is the flyback screen voltage can be found from flyback transformer most common color is red and be insert to the hole.  

Oct 17, 2009 | Sony KP-46S25 TV

1 Answer

Flyback making a poping noise


You can get the replacement Flyback at the following link, and they provide free instant messageing tech support to take you step by step with the replacemnet proceedure. You need phillips 32942 flyback, its listed in their flyback catagory.
http://servicemanuals.vstore.ca/

Jul 27, 2008 | Philips 60PP9202 60" Rear Projection...

1 Answer

Daed tv


Hi airbags29!

Does this set have one or three projection CRTs? If one, just follow the high tension wire that connects to the middle (front to back-wise) of the tube...this comes directly out of the flyback...
If three tubes, there MIGHT be three flybacks, or all three could share the same secondary anode supply voltage.

Don't do this with the set on, and be aware that the CRT(s) can act as giant capacitors and hold a SUBSTANTIAL charge even after being off for months! Discharge the tube with an insulated screwdriver or test lead, grounding the connection on the tube.to metal framework. I've accidentally stuck my elbow into a 25,000 volt SURPRISE more than once, and it is a SHOCKING experience !!! Ha !!!

Hope this helps you out, let us know if you need further assistance, or you can contact me directly at wldbil49@yahoo.com and GOOD LUCK!

-WB

Jun 14, 2008 | RCA P52960 52" Rear Projection Television

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