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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
Flyback transformers

 
 


GASANT
New User

Apr 28, 2012, 2:37 PM

Post #1 of 2 (2149 views)
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Flyback transformers Can't Post
Hi Everybody
Please help me understand how FLyback transformers function.

These are the pins which I need clarified.
The meaning and function of pins.(these are engraved on mother board of my crt tv)


1) 180v
2) Etho (cover 2 pins)
3) Afc
4) H
5) Gnd
6) -12v
7) +12v
8) B+
9) Hy

2) Please explain which pin is input power pin from tv onboard smps.

3) 3 red cables are attached to rear of tv. I assume thick red with sunction cup into glass(which carries highest volts) . Middle size into focus. Thinnest cable for screen setting.

4) B+ is output current

5) How do I know whether capacitor and diodes are internal or external of flyback transformer

I highly appreciate your patience with me.
Thank you
Gasant



Ron.M
Veteran


Apr 28, 2012, 5:49 PM

Post #2 of 2 (2141 views)
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Re: [GASANT] Flyback transformers [In reply to] Can't Post
  

GASANT;....

1st , a couple of questions from me;....
What are you trying to fix that you need all this info for ???...
Can you explain your problem & give us a brand name , model &/or a chassis number ???....

Now for your question;=>...

1) 180v << This is the B+ source for the video drivers on the CRT board...
2) Etho (cover 2 pins) << This is possibly the "Dag" ground connection , also called the HV ground...
3) Afc << This is feedback for "Horizontal Frequency Control" & is for keeping the horiz frequency locked in...
4) H << NO clue ???
5) Gnd << Do I really have to define this one ???
6) -12v << This is the source for -12 vdc that is used in other circuits...
7) +12v << Same as above , except it is the source for +12 vdc...
8) B+ This is the pin that goes to the Horizontal Output Tube/Transistor thru the flyback so the transistor/tube gets its B+ ....
9) Hy << Not sure about this one , could be for the Horiz deflection in the yoke...


What is missing up there , are connections for the CRT filaments....


2) Please explain which pin is input power pin from tv onboard smps.
That would be pin #8...



Quote
I assume thick red with sunction cup into glass(which carries highest volts) .
In most Tvs , that wire will have about 30,000 volts on it...
Do NOT cut it , do NOT remove it from the CRT OR you could get ZAPPPED big time....Unsure...

4) B+ is output current
NOPE , see above....

5) How do I know whether capacitor and diodes are internal or external of flyback transformer..
Every flyback made in the last 20+ years has diodes internally for HV rectification...
Some did & some did not have caps internally...
There's no way for you to know if there are or are not caps inside other than looking at tech info for the flyback...
There's NO test to determine their existence or if they are good/bad...
Now that I answered YOUR questions , PLEASE answer mine above...THANKS....Sly...


Later....Ron.M...Cool...
Veteran & Retired TV technician

(This post was edited by Ron.M on Apr 28, 2012, 5:55 PM)

 
 
 


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