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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Posted on Jan 02, 2017

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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 | Televison & Video

Tip

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

f3f741f.jpg







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

with the horizontal drive and horizontal output transistor

58689de.jpg






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

ab6c901.jpg



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

b3363d6.jpg


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

A horizontal line on the screen Dell studio 1558


seems like your screen have some dead pixels. the only solution is replacing the screen. ita a hardware problem not software.

Aug 28, 2012 | Dell Studio 1558 Notebook

1 Answer

If the light intensity is high, the pictures appears to be almost white and horizontal lines can be seen.. does it something to do with its lenses??? if light is low, it is clearer but still horizontal...


The lens cannot itself create the lines. The fact that there are horizontal lines indicates that the sensor and/or its related electronics is faulty. It is best to contact support from the manufacturer's website as this does not seem to be an easy problem to solve by oneself.

Please rate Fixya answers.

Apr 18, 2011 | Cameras

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

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

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...

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