Question about Hitachi 57G500 57" TV

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Green crt not getting signal

Tech swapped the green and blue signals to thr crt's and the green works.

estimate is 500 for signal board replacement. any suggestions ?

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Before you sink 500 into the signal bd
I would double check the crt bd for the green gun

There is a couple of resistors on that board that go bad (open up)

this does not sent the signal in


Did the tech use a scope to determine weather you have signal to the crt bds or did he just switch the crt bds from one to the other ?
I bet if you change the crt board or ohm out the boards you will find a open resistor

Posted on Feb 10, 2009

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Posted on Jan 02, 2017

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Our toshiba rezga 47lz196 colour is off. There doesn't seem to be any red. All the skin tones are green. Blue shows up but all the other primary's are green. We have green, blue, yellowish, black and...


There are only two possibilities for this problems for this tv.One: the tv incomming broadcasting signal cable wire that is plugging into ur tv Tuner signal board could be bad.U can test this out the incomming broadcasting signal cable wire is good or bad pretty easily by just plug it into another tv to find out the incomming signal cable wire is bad or good.Two: If the tv incomming broadcasting signal cable wire is good by plug it into a another tv.Than ur tv the tv Tuner signal board is the causes and the problems.The tv Tuner signal board CPU chip is bad.U can do some mechanical work like take things aparts and putting it back together again?Yes.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish tv Tuner signal board for the replacement.

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Hi,

This could be a heater-cathode (H-K) short in the CRT, a failure of a component in the chroma circuits or video output (driver board), or bad connections there or elsewhere. Don't panic - heater-cathode shorts in CRTs can often be worked around.
Note: before proceeding, it is a good idea to make sure that the screen is degaussed - else you could be attempting to track down problems with the wrong color!
Some simple tests can confirm or rule out other possibilities.

  • Compare the voltages for the video drive signals to the CRT on the little board on the neck of the CRT with the CRT both connected and unplugged. A schematic will help greatly in locating these signals.
    • If there is a significant difference especially on the bad color, then the CRT is a likely candidate. Try tapping the neck of the CRT GENTLY (with it plugged in and while viewing a picture) to see if it is an intermittent problem.
    • If there is no significant difference, you may have a bad driver or a problem in the chroma circuits.

  • Look for bad connection/cold solder joints, probably on the little board on the neck of the CRT. Use an insulated stick to gently prod the board and its components in an effort to induce/cure the problem. Look carefully for hairline cracks around the component leads.
  • You can swap components between two colors and/or test with an ohmmeter on that driver board to determine what is bad. The nice thing about color monitors and TVs is that there three copies of each of these components. Swapping and/or comparisons between these is an excellent diagnostic technique.
  • Another simple test: Disconnect the cathode for the full-on color from its drive. If it is still full-on, there is probably an H-K short in the CRT since the only way to get each color on the screen is via the cathode connection to the CRT neck board. If it is removed and there is still that color, the current must be taking another path inside the CRT.
  • Alternatively, interchange the outputs of the bad color with a good one by jumpering on the video driver board (on the CRT neck). If the bad color changes, then the problem is in the circuitry and not the CRT.
So you have to get a tech if the above method doesn't solve your problem and get it fixed..

Goodluck,
Please don't forget tor ate me as fixya..

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My TV screen turns green with no picture until i turn it on and off TV is approx. 2.5 yrs old and is used very little and it seems to be getting worse thanks Kent


This tv a CRT tube tv?Or a LCD tv or a Plasma tv?The tube tv,the video board that connect to the CRT tube head have problems.The Plasma or a LCD tvs.The main board,call the Tuner board is the cause,this board,that where the incomming broascating signal cable plug into it.CRT tube tv,old technology,must take to tv shop for estimate and repair.Plasma or LCD tvs can tries websites like Shopjimmy.com or Ebay.com to buy a refurbish Tuner board for the replacement.

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Yellow circle in center of screen & blue shading to side


Hello, This will require you opening the back cover of the television. This could be a heater-cathode (H-K) short in the CRT, a failure of a component in the chroma circuits or video output (driver board), or bad connections there or elsewhere. Note: before proceeding, it is a good idea to make sure that the screen is degaussed - else you could be attempting to track down problems with the wrong color!
Some simple tests can confirm or rule out other possibilities.
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If there is a significant difference especially on the bad color, then the CRT is a likely candidate. Try tapping the neck of the CRT GENTLY (with it plugged in and while viewing a picture) to see if it is an intermittent problem.
If there is no significant difference, you may have a bad driver or a problem in the chroma circuits.
Look for bad connection/cold solder joints, probably on the little board on the neck of the CRT. Use an insulated stick to gently prod the board and its components in an effort to induce/cure the problem. Look carefully for hairline cracks around the component leads.
You can swap components between two colors and/or test with an ohmmeter on that driver board to determine what is bad.
Another simple test: Disconnect the cathode for the full-on color from its drive. If it is still full-on, there is probably an H-K short in the CRT since the only way to get each color on the screen is via the cathode connection to the CRT neck board. If it is removed and there is still that color, the current must be taking another path inside the CRT.
Alternatively, interchange the outputs of the bad color with a good one by jumpering on the video driver board (on the CRT neck). If the bad color changes, then the problem is in the circuitry and not the CRT.
To identify if the fault is in the CRT or a control problem try this (WITH SET OFF):
On the CRT board, lift the output end of the green cathode final resistor. Do the same with the offending red cathode's resistor. Use short insulated jumpers to 'swap' drive signals - drive the red cathode with the green drive and the green cathode with red drive. (Note that if this problem only occurs after a warmup period, color at turn on will be - well - wierd, but it is just a test.)
If instead the symptom becomes 'goes green' then the red drive leg has the fault and the CRT is probably good. (In this case, there may be bad connections or a bad component on the CRT drive board. Also it involve a technical skilled personnel to handle this..

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VGA PIN


pin no 1 - Red colour signal (Red colour wire)
pin no 2 - Green colour signal (Green colour wire)
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9&10 NC
pin 13 Hohizontal sync signal
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I have no picture coming out of my blue picture tube


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Yes i need more help on these opto-couplers


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Get into service mode


if it cannot be adjusted then there is a problem in tv. as your green color is absent you will get red+blue=purple your problem is in green video ckt please check 1 sypply to green cathode ckt 2 loose contact in crt base 3 loose signal connector 4 check components related to green cathode& green video tr. itself 5 check for green signal is coming to green video section from processor. 6 signal processor ic if you are not tech person get it done by skilled tech. it is a common problem. it is a not a major problem. please check

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