Question about Sony KP-51HW40 51" Rear Projection Television

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Reducing voltage for Sony KP-51HW40

How do you reduce the G2 voltage?

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G2 = screen...On the screen controls behind the front grill, behind the hardboard. 6 pots, 2 rows of 3 pots. 3 for focus and 3 for screens. 1 for each of the the red, green and blue guns/crts.
To adjust: Run set, change to black screen with tv/video button. Dial each screen clockwise untill you see a color. Then counterclockwise slowly untill that color goes black, then stop. Do this for all 3 screen controls.
If you need to adjust the focus then bring up lettering. I use the QVC channel for this. Focus is done by eye.

Posted on Mar 25, 2008

  • Steve Wainright
    Steve Wainright Aug 26, 2012

    Fixed it! thank you for you're expertise.

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1 Answer

I have no picture and the power light flashes green and then red.


Hi,
I can help you to solve your Sony tv problem.
Is it Sony KP-51HW40 tv or any other model?
How many times red light start blinking after three seconds long pause?
Let me know to proceed, can you check voltages with multimeter in tv circuit board?
Thanks.

Nov 26, 2010 | Sony KP-51HW40 51" Rear Projection...

1 Answer

My 52" rear projectionT.V. Is about ten years old and for the past year the picture takes a while to appear. Sometimes the picture will blink on and off for hours, while other times the picture will only...


You generally have a weak capacitor in the power supply, that will delay a startup! Second to these are poor grounds on any and all ICs attached to heat sinks. A heat sink is a large metal piece mounted on the TV board. It is a cooling fin to reduce heat on the IC. The pins are underneath these, and will have cracked rings around them. These of course reduce voltage and a promote a slow startup. Please check all capacitors with a capacitor checker and look closely underneath the TV board for bad solder grounds and resolder!

Sep 25, 2010 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Picture fade to blue


You can reduce the g2 for the blue tube
open the front grill and open the 4 screws hold the resister block
to have acess to the register block.
Then there should be the black box have 6 knobs
the one call for Blue g2 not the focus block.
Adjust it counterclockwise a little bit
and try turn on TV again



Jan 09, 2009 | Sony KP-57WS500 57" Rear Projection...

1 Answer

Sony KP-51hw40 -No power


Let fixya know that you accepted my answer by mistake. They will fix it for you.
Have you check any voltages from the G board (power supply)?

May 18, 2008 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Sony KP-51HW40 51 in. Rear Projection turns blue


Hello......
First reduse the G2 voltage for the blue c.r.t,and watch if the unit works for longer period (offcource blue colour will be not present).After reducing G2 voltage to blue c.r.t still behaves the same than c.r.t is faulty and you have to replace.
Pls count the red led blinking when it goes off,incase it goes to std by mode.
Gopali

Dec 14, 2007 | Sony KP-51HW40 51" Rear Projection...

1 Answer

No picture..


hello,,,,,
Picture mute is activated ,it can be vertical amp faulty or one of the c.r.t drive faulty,therefore the mute circuit is active.Increase G2 voltage for the any of the three c.r.t and notice screen .Vertical amp is faultry than you will see horizontal line across the screen and if you see full screen with flyback lines ,means c.r.t drive is having fault.isolate one by one c.r.t drive.
Gopali

Dec 12, 2007 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Tv will not stay on.


Hello....
This problem is related to ABL control .
Trace ABL signal from Pin no 11 of flyback transformer.Mostlikely value for the resistor in abl line has gone high.First case reduse the G2 voltage and see if the unit works for long.
Second case its sure that its ABL problem.

Nov 20, 2007 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Green hue


GO to service mode ,On std by mode press diplay-5-volume plus-power button on remote con.
reduce green drive to balance .For good adjustment you need white picutre .Also reduce brightness to noticeble lavel.

Sep 12, 2007 | Sony KP-51HW40 51" Rear Projection...

1 Answer

Picture Quality


without seeing a picture I can guess that you may have a shorted green crt or the drive going to it has changed and you may need to turn down the g2 control for the green. If the tube is shorted or bad see what type of warrantee you have on the crts as some sets have two to 5 years. Good Luck

Apr 22, 2006 | Sony KP-51HW40 51" Rear Projection...

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