Question about GE 31GT740 31" TV

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What is the g2 control?

I had the question earlier about the green horizontal lines. I was very pleased to find an answer to my question, but now there is one problem. The answer said something about a g2 control. I dont know where the g2 control is located, or even what it is. Could someone please help me with this problem? Thank You!

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Hi The g2 control is located behind the guns inside the t.v if you dont got the touch DO NOT DO THIS!!! ***DANGER OF DEATH*** 30,000V will burn you to the gruond after 3 days with no power (unpluged) it will dissolves open the back and locate the G2 control then with a long screwdriver adjust the control while looking on the screen if it fads BE careful good luck

Posted on Mar 27, 2006


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My Zenith SG2721H has thin green horizontal lines across the screen.

Most "modern" CRT TVs have automatic color biasing which means a complete of manual control. Depending on how your set is manufactured, it may have a control for each color located on the neck board for adjusting the drive to each of the CRT guns.

What you're seeing is called 'retrace' and you're correct that this has to do with color blanking. The most common issue causing 'faint' retrace is too much drive to one of the CRT guns. Hopefully, your set has an adjustment to back off the drive for the green gun. If not, this can be the result of a bad capacitor or leaky transistor in the green circuit.

If all else fails, locate the SCREEN of G2 knob on the back of the flyback transformer and back it down a touch; sometimes this is all it takes.

Dec 14, 2012 | Televison & Video


A) basically it has to be acted upon by a supply voltage of at least 95V to...

a) basically it has to be acted upon by a supply voltage of at least 95V

to work.

sample picture


b) of course, assuming the horizontal deflection oscillator works, same

with the horizontal drive and horizontal output transistor


it would generate output voltages on the secondary terminals

and 200V line will be active sending voltages to the

Video Drive circuits. Of course high voltage will be generated

ranging to at least 30 KV and there will be voltages on the G2 of the tube.

c) the easiest test point to look when it is oscillating, is the CRT heater

voltage, the heater lit when flyback is good ( mostly at night times when it

is dark ) and you can hear sounds, too.

here is a sample image


marked with letter H and H1

Green Arrow for the G2 voltage

d) having a B+ voltage reading of 75 V or lesser ( primary pins )

indicates a bad or partially shorted flyback, assuming your

horizontal output transistor and power supply are good & OK.

sample of H out


These only applies to CRT type TV's.

on Dec 24, 2009 | Music

1 Answer

KV-HP212M83 greenish blackout blinks 2 times

Measure B+ on the set , If normal check G2 voltage

G2 adjustment is on the Flyback Transformer

Oct 14, 2012 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

Dark and light horizontal lines in picture. What to do?

red, green and blue bowed lines? could be retrace lines. check CRT(picture tube) or try adjusting G2 voltage. What brand and model?

Dec 28, 2009 | Televison & Video

1 Answer

Has horizontal lines running through screen,had it fixed when it wouldnt power up.a week later have the horizontal problem

problably when the repairman fixed your first problem, he touched the adjustements on the block focus assembly, there are 6 knobs (2 for each tube red, green and blue) one is for the focus and the other one is for screen or also called G2. you must get a technician, there is a very high voltage there

Jun 27, 2009 | Mitsubishi WS-65809 65" Rear Projection...

1 Answer

Further assistance needed

I just replied you and here once again...

Please pull front speaker grill and find focus block, fixed at corner having 6 control knobs on it.
Find Blue Screen control knob there.
Put your TV in AV mode to get dark screen and just press Display button on remote to have AV display.
Now slightly rotate control knobs counter clock wise until thin lines (retrace) disappear. Job is done and put back speaker grill, press display button again to disappear screen display.

Dec 13, 2008 | Sony KP-51WS500 51" Rear Projection...

1 Answer

Green lines

Due to vertical section failure horizontal line apprears. You did not mention about picture. Green horizontal line means with picture or without picture. With picture means there is some leakage. Without picture only singe horizontal line means vertical section totally not working. Particularly green horizontal line means maybe leads to jungle ic failure. Please mention your simptom clearly what you get and what you will not get both video and audio. It will be helpful to answer. Based on your question this is my small information.

May 24, 2008 | Sony KV-35S42 35" TV

1 Answer

Horizontal grey lines on TV

Sound like you have to turn down the G2 (screen)controls. They are turned up too high.

Jan 01, 2007 | Panasonic PT-56WXF95 56" Rear Projection...

1 Answer

Green Lines Horizontally

yeppers its a g2 control on the flyback thats gone or drifted out of alighnment or the flyback its self.Try turning the g2 control dowm till those lines fade. If they wont go away then you need someone to check the Picture tube or its componets driving the crt.

Mar 26, 2006 | GE 31GT740 31" TV

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