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I want service code for hyundai HY-21N08 .and i cant adjust the focus on the flyback.

I allready change the crt socket but still not in focus.

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Hi. In almost all flyback trafo's there is a potmeter(knob) where you can adjust the focussing voltage. In some cases however, there is a separate HV potmeter with a connection to the flyback trafo. Normally there are two wires coming out it it. One for the acceleration anaode (25-29 kV) and another mostly thinner wire going to either the CRT socket (4-5 kV), or this divider unit with focussing potmeter. Servicecodes won't help here. These are only for geometry, ctr bias etc.

Posted on Nov 20, 2014

Testimonial: "I its time to replace the flyback."

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Posted on Jan 02, 2017

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gopakumarg43
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SOURCE: hy-21n08 schematic diagram

For what? Brand name? Model number? Check the site linked below. There are some schematics. If you can't find your's, send your email address to me by Fixya. Please provide the exact brand name and model number of the set. If I've it, I'll surely send a copy of it to you by return mail.
Visit the site named 'Electro-help' for more details. Click this link. View it in "Timeslide" or "Flipcard" option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. You can also click the [Home] tab to see the latest updates. It will make search easy. There are more than 1350 posts to different brand TVs now. Pull up older posts there or make a search by typing in the brand name of the device in the "Search Box", at the top right of the display window


Posted on Dec 04, 2012

gopakumarg43
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SOURCE: How can i Set Haier tv, my haier 14'' CRT change With 21'' CRT so vertical Hight is short, how can i adjust vertical hight.. IC "Trident TDA 11105 PS/V3/3/AP3

You can check it by reducing the value of the resistor, connected to ground at one end of the deflection yolks' vertical scan out windings. Usually, this resistor will vary a value of 1.2 Ohms to 2.2 Ohms. But, if you reduce this value too much, to say at about 0.15 Ohms or so, there is a possibility of damaging the vertical scan output IC.
So, do this very carefully. It is a trial and error process.
Check it with gradual reducing this value of this resistor; by 0.25 Ohms at a time. Wish you success. I hereby advice you, assuming that the horizontal width of the picture is OK.
If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy Pull up older posts. Surf the site with patience.
http://electronicshelponline.blogspot.com/

Posted on May 05, 2014

gopakumarg43
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SOURCE: No picture, sound is ok, if i try to adjust from

Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Posted on Oct 29, 2014

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1 Answer

Image not focused


Possible worn out tube. The focus adjustment is on the flyback transformer and has to have the back cover removed to access it. The flyback will be a black and have a red wire connecting to the crt tube. This is very high voltage and can be dangerous. With a plastic screwdriver you can turn the focus adjustment knob on the transformer. Do not adjust the screen control knob. If the focus does not clean up, then the tube is probably worn or the flyback is bad.

Nov 27, 2013 | Samsung SyncMaster 1100MB 21" CRT Monitor

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Picture goes dark but there is sound


There are many cause of dark picture symptom of standard television.First thing to do is try to adjust the screen control adjustment located at the flyback at the lower parts.There are two flyback adjustment the focus and screen adjustment.The upper level is focus and the lower is screen control. If check also the CRT socket board section.This CRT board is compose of high voltage terminal coming from the high voltage supply.Check if there's a cold solder in CRT socket terminal and other parts around the CRT socket.The heater supply,the RGB cathode supply,and the screen supply are the supply of picture tube to be lights up.So try to resolder those parts of the TV.Avoid short circuit in the PCB board.Hope it will help you.Thanks..

Aug 29, 2011 | Sharp Televison & Video

1 Answer

CRT monitor screen is out of focus.text and other images looks blurry


Hi,

This kind of symptoms can be correct by the focus adjustment at the flyback transformer. FBT mostly has two control knob (Focus and Screen), focus is usually at the top one like in the sample picture below.

jdvillanueva_86.jpg

Open the back cover of your unit and then locate the FBT. Power on the unit and try to adjust the focus knob.

If the symptoms can't be cured by the this step, this is an indication that the CRT socket is already faulty. You have to replaced this parts and then make some adjustment at the focus knob of the FBT and your unit will back to normal again.

CRT(picture tube) socket

jdvillanueva_87.jpg


Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Jdvillanueva

Jul 14, 2011 | Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

Picture is like dull. i ajust the focus in the flyback then comes like fine vertical lines


The trouble is not the focus of the flyback transformer, the one you adjust is the screen try to return the original position. try to check the crt socket it is connected to the picture tube if you see something in the pin that is color green it is corroded try to replace it with the same type of crt socket.

May 20, 2011 | Televison & Video

1 Answer

Picture blurred


blurred picture can be adjusted,and sometimes replacing of crt socket will solve the problem.
this is tricky so i've advice you to follow what i've said strictly.
Open the back cover of your set (make sure that you unpluged the unit first).
Look for the flyback transformer (it has a sunction cup connected to the picture tube).
You will see an adjustment knob on it, it mark focus but wait before touching,mark it with your pentel pen,marking the original location of the knob is important because that is the factory align.
After marking get an screw driver w rubber insulator as a handle to avoid an electric shock,this will be used to adjust the focus on the flyback knob.
Turn on the unit and hooked it up by your dvd player.
Play the dvd so that you will see a picture on the screen.
Pause it with a picture with characters.
Now you can see the blurred picture?
Try to adjust the focus on the flyback back and forth minimal turn only.
There's a reaction?Yes- continue to get a perfect picture and youre done.
There's a reaction?No- back the knob on its original position.
Your crt socket is faulty.
try some helped of your technician or people knowledgeable of disoldering and soldering technique.
Pull the board on the crt socket.the socket which attached to the tube is the one you are going to replaced. I've adviced you to observe first and familiarized what are going to dis-assemble because you will do the same when you replaced a new one.
After replacing your crt socket,picture ok?Yes-you're done
After replacing your crt socket,picture ok?no-picture tube is faulty.........

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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

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1 Answer

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the problem of you tv is the CRT socket ,replace the socket.

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1 Answer

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Focus adjust is located on the neck board or on the Flyback transformer, another fault is dirty spark gap inside the CRT socket

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The problem could be with the CRT base socket, why don't you try replacing that? It is not a costly component, and it is easy to replace. Make sure you buy the exact same thing and verify connections.

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2 Answers

Picture brarred, focus responding but cant improve picture quality


did u try adjusting the focus knob in the flyback transformer? this device is connected to the anode of the picture tube which produces the high voltage so be very careful of adjusting it. dont touch the wire linking to the tube. thats approximately more than 21,ooo volts dc! good luck!

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