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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Re: What is the g2 control?

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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How do i fix my crt sharp 21G2-s tv whose screen is total black when switched on?

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.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

Feb 18, 2015 | Sharp 21" Multi System Stereo TV


How to test Flyback Transformer Without taking it off the Boarda) Basically it...

How to test Flyback Transformer Without taking it off the Board

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

sample of H out 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 CRT.

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 ( if speaker is connected).


• Heater : 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.


• These only applies to CRT type TV's.

on Jul 31, 2012 | Philips Standard (CRT) Televisions

1 Answer

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 | Standard (CRT) Televisions

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

Only a horizontal line can I see in my TV

In most cases the vertical output IC and possibly a fusible resistor off of the high voltage transformer are bad. The vertical output IC is located on a heat sink and usually right next to the vertical yoke winding connectors that are green and yellow in most sets. Please take a moment to rate my answer..Thanks...

Nov 24, 2009 | Sharp 27G-S60 TV

1 Answer

Slj4899 KV32DX30u led flashes 5 times no picture

Please check 1000 volt at CN703 on C board fixed on picture tube.


Nov 10, 2008 | Standard (CRT) Televisions

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

2 Answers

Green horizontal lines

Hi, I have a Philips 29PT9009/12 TV. Recently I have begun to see horizontal green lines on my tv, when either watching a dvd or watch tv. This has gotten worse and now the green lines are more visible and the background is now turned a shaded green. Please help me. Thanks in advance

Apr 30, 2007 | Philips 28PW6506 28" TV

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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