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Abnormal colour in aiwa tv ic noTA8759BN

Abnormal colour in aiwa tv ic used TA8759BN i am not ale to adjust preset for red and blue in nuck board

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  • dicky_m Dec 11, 2008

    The colour son my Aiwa tv are not actual and even the words are blurred cannot be read

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You need to use Aiwa Service Remote to enter in service mode and adjust service data for red and Blue drive of CRT.
Do you have that remote and service data reference book of Aiwa tv ?

Posted on Oct 07, 2008

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Posted on Jan 02, 2017

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The colour on my TV is awful, the colours are not true at all. Red looks orange, blue is glaring blue and sometimes the colours fade out a bit and then come back. I have tried adjusting everything but...


I presume this is a TV with a picture tube, and if so, it would either be the chroma decoder IC or the jungle IC which could be possible causes of untrue colour, as well as the small components around them. Electrolytic capacitors, especially those in the chroma decoder circuit, tend to change value over time. Check and replace these first before diving in and replacing ICs. If the greyscale tracking is OK, as well as the overall picture, then the tube is probably OK. If it is not, and the images appear washed out and blurry, then the tube is on its way out, which means only one thing: throw it away.

With any IC replacement, it is a good idea to invest in special IC sockets - these are available from most electronics stores for a small price (you then trim and solder the sockets to fit the board as required) this will make it easier to swap ICs in the future if necessary without further soldering.

Feb 16, 2011 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

Screen is red


Hello

The red colour output section in your TV has some short in it. This section can be located at the picture tube base card, the printed circuit board along with some components are fitted with it. There will be three cathodes, Red, Green and Blue; usually marked as Kr, Kg and Kb. Take the voltages of these pin points at this board. It should be almost the same. In your TVs case, the voltage at the red cathode will be very low now. Look whether transisotrs or Ic is used for video output section in this side. Usually Sony uses transistors. Check the resistor at the collector of red output transistor. If it is open, replace it. If the resistor is OK and still there is no voltage, and the said resistor heats up abnormally, the transistor related to it is leaky [collertor-to- emitter short]. Replace it with same type and number will solve your problem. OK.

Jan 10, 2011 | Sony FD Trinitron WEGA KV-34HS420 34" TV

1 Answer

Although tv is showing picture the colours only showing background etc are green and blue


Hello
Your TVs red colour output section has the trouble. There is no red output at the red cathode of the picture tube. The red, green, and blue output sections are on the picture tube base board. In some Philips model, these will be consists of transistors, and some has an IC or Tree ICs for three colour output used. You just open your TV, measure the voltages at these three cahodes. There will be markings on the printed circuit board for these cathodes marked as [Rk,Bk and Gk].
In your TVs case the voltage at the Rk marked pin will be higher that the other two cathodes. This can be caused by an open drive transistor or an Ic whichever may ysed there. If it is transistor, just replace it with a same type and number, as in the ace of ICs the related Ic, must be replaced. If only one Ic is uded for red, green and blue outputs, that Ic must be replaced.
If you need any more assistance, feel free to get me through Fixya. Ok.

Dec 01, 2010 | Philips CCB130AT 13 in. Combo

1 Answer

No green and yellow colour


Hello
If you see the picture in yellow colour, means that there is no blue colour output from the video drive section in your tv, Yello is the mixtrure colour of red and green. Green is actualy there. blue colour is absent.
To detect this fault, you must open your tv. Just look in to the video output section, can be located at the picture tube base card, which is plughed into it diretly. See for any loose soldering points there. Check whether transisotors are used for red, green and blue output stages, or an Ic or three seperate Ics are used for this purpose. Anyway, blue catode of your picture tube pin gets a hig voltage, and so the blue emission is absent. You just check the voltages at red,gree and blue catodes, at the respective picture tube pins, which can be taken at picture tube base card. All of these three pin voltages must be somewhat equal to each other. In your case, no voltage at blue cathode will be higher that the other two. Check for the reason. It may be due to an open video output transistor [blue], or an Ic, of one Ic if used for the three colour outputs. Check and replace the same, will rectify your problem. Ok
If you have andy difficulty, get it to me through Fixya. Ok
Gopakumar, India.

Nov 21, 2010 | JVC AV-27230 27" TV

1 Answer

My tv model 60P8341A philips television screen is red and dull in color what do i need to do?


Hello
If your TV screen looks more red its red video output section is in trouble. Some philips circuts uses transistors while others uses ICs in that section. Philips magnavox model have both types. We here in India, have transistorised video output stages in Philips Magnavox sets. Whatever the ciruit type may be, the fault and its remedy is same.
Check whether your set has transistors or ICs used. If transistors are used, check the collector voltage at red video output transistor. If ICs are used, some sets uses a single IC for Red, Green and Blue output stages. Some of them have three ICs on board as Red,Green and blue output stages.
The video output stages are integrated on the base card of your TV. That is, a small square or rectangular board, pluged into the neck of the picture tube. You just find out the red,green and blue output transistors, or ics whichever may be used. It is ver easy to understand the video output transistors. They may be a little larger than other transistors.
An easy way is to locate the Red,Green and blue cathodes of the picture tube base board points. Check the voltage of the three of them They must be almost equal to each other, provided a little, that is, 2 or 3VDC difference is allowable and will be. In your case, the voltage at the red cathode may be , not may be, must be low. As cathode voltage lowers, emmision of that cathode will rise, and poise that colour is in excess. If the Red Cathode voltage in your TV is found low, say difference betwwen other two cathodes is 50v or so, repace the red output transistor or the Ic if used at that stage. If a single Ic is used in your TV as R_G_B outputs, replce the same. If three Ics are there, replace the red output control Ic. ok
If you have any more problems, inform fixya. They will send me alerts.
Thank you

Oct 20, 2010 | Philips Magnavox 27MS343S 27" TV

1 Answer

Red colour appearing on screen


Your tv could have one of several faults. None of which are to be tackled by anyone except a qualified engineer due to the electric shock hazard.the first problem could be the crt (tube) the second could be the componets on crt base circuit board ie resistors or ic.
With a tv 9 years old it may not be economical to carry out a reair.

Jun 01, 2010 | Thomson 21DC320 21" TV

1 Answer

Sp 55w3hf Convergence


Some TVs do use three ICs, one for each colour. These ICs are likely all identical. There could be fuses blown. Fuses can look just like resistors. A manual points them out or they are shown on the board as F101, or ICP 101 or CP101 or the like. Fuses usually affect ALL the colours at once, so I am looking for the third IC.

Mar 22, 2010 | Televison & Video

1 Answer

My picture has far too much red in it. Where do I


there should be 5 or 6 preset on the crt(tube) base 3 of them should adjust red /green blue in the white aera and the other 3 adjust re/ green /blue in the dark aera make these adjustment with the colour turned off.
Sad to say that this is most likley a low crt the blue gun as gone low.

Mar 06, 2010 | Orion1934 19" TV

2 Answers

RCA P52731WK REAR PROJECTION NO RED ON SCREEN


The RCA model is a 3 CRT projection TV. Most probably you need a new RED CRT, or there is a problem with the R(ed) channel (the picture is made up of 3 component colors: Red, Green and Blue). No way of telling without testing of the projector. Sorry!

Jul 11, 2009 | RCA P52926 52" Rear Projection Television

1 Answer

Picture has no green, only has red and blue


on the piture tube are three transistors one for each colour, test all using an avo, if all transistors are okay.
change the colour IC on the main board

Apr 25, 2009 | Zenith Televison & Video

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