Question about Thomson LCDB 03B 27 in. Television

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Thomson 28WF64U crt 100Hz. white pixels comes & goes after period

Some times this CRT based 100Hz TV will function correctly all day. The next individual white square pixels appear. Some times in lines, sometimes around the outline of objects or both. This problem can fade to nothing then the picture can get so bad as to be almost unwatchable. The next day be fine again with no problem. This only started recently but is becoming more frequent.
Anybody any idea as to which component may be at fault?

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SOURCE: 32" lcd after a while picture goes to negative (inverted colour) somtimesd on power up also

i allso have a techwood lcd3211. just wondered why you migh think its a wafdale re badged, i am tryng to get mine fixed but no one can get hold of a service manual for this tv. i know they are currys own brand but no one seems to be able to fix them without this manual. currys dont want to know s warrenty has run ou. any information you might know would be appresited. cheers.

Posted on Nov 27, 2006

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SOURCE: Thomson 27" LCD TV 27LCDB03B

cannot be presise but at worse the lcd back light is failing or the supply to it . this is a job for a service engineer

Posted on Jun 11, 2010

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SOURCE: Thomson 27 LCDB 03B

when i turn on my tv the light turns orange green for a few seconds.

Posted on Jul 23, 2010

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Tv fault finding


I assume you might have post this problem under CRT based TV; and not with Flat Panel TVs. Anyway let me post a solution to this. The first thing you have to do is, to solder all the four connections to deflection yoke. It's a must. Never allow any loose contact with these connections. It might lead more troubles. Never switch ON the set, without soldering these connections well.
Then comes, the case of raster. If there is only a blue raster, with horizontal lines, as you describe here, it should be the fault with its video output stage circuit itself, provided CRT is good. If the horizontal lines displays at equal space, that is, at about an inch space, all around the screen [white thin lines], and are some what parallel to each other, check the voltage at the blue cathode of the CRT base. If this voltage is very less than the other two cathodes, check the blue video output transistor's collector voltage. Check the transistor for collector-emitter leak. Replace it. Check its collector voltage. If found very low, check and replace the load resistor connected to it collector to video output supply voltage [180VDC].
I think you to be somewhat sound in elelctronics, and is why I spend some time to place this solution here. For more information go to http://electronicshelponline.blogspot.com/. Pull up older posts. Hopes it will help you. Good luck.

Nov 28, 2013 | Flat Panel Televisions

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White Raster with thin lines; Sound Ok.


White raster with retrace lines: No picture, Sound OK
(picture tube based telivisions.)

It is a common fault to occur in most of the CRT based telvisions, regardless of which brand it is. There will be sound OK, and a bright screen with thin white horizontal lines across; at about an inch space, all over the screen area. This fault may occur along with colur shades also, like blue screen with white retrace line, red screen with white retrace lines, green screen with white retrace lines. Let us take the first case. A white raster with white thin retrace line acorss the screen. These are call vertcial retrace lines technically. To make it mor understand, we have to go to some picture tube electrode details. There are three colour cathodes for a colour picture tube, Red, Blue and Green. Two girds are there called Focus and Screen. Focus grid is supplied with focus voltage which in turn determine the cocus of picture, and screen grid is supplied with screen volrage which determine the emission of the picture tube; in short. There is a final anode to all the picture tubes, which supplied with Extra High Tension voltage, can be located at the top side of the picture tube, to which the EHT voltage from LOT is connected with the help of rubber ****** and clip. Without these three voltages, EHT, Screen and Fcous, no raster will be produced. Therefore in our case, there is a raster, so, horizontal output section including Line Output Transformer [LOT] is functioning well, and as far as sound is there, tuner and video IF section are working well. In fact, all other section except, video output section is working properly.
There are three cathode points on the base card, marked as Bk, Rk and Gk. Check the voltages of these three cathodes. In our case, it will be very low or approximately equal to zero. When cathode voltages goes low, emission of the CRT increases, is the reason. There must be a voltage between 120 and 135VDC at these points. Find out the reason for this voltage drop is the next step. The video drive voltages in most TVs comes from LOT windings, after rectification and filtering. There will be one reisitor of low value, say one Ohms or so, will be connected series with this winding, in between diode and winding. Check the voltage at the cathode of this rectifier diode first. If found low replace the diode and the smoothin capcitor. The smoothing capacitor will be between 33 and 47MFD 250VDC rating. Replace both of them. If there is volatge, say 200VDC or so, check whether this voltage comes to the CRT base board or not, If not, check the conducting wire, serial resistors; if used for open. There is no chance of transistor shortage at this time as the raster we see is white. If raser we see have a specific colour predominent, that is green, blue or red, check the revalent video out transistors and replace it. It is best to replace all the three video output transisors at the same time with same batch and number.

on Apr 18, 2011 | Flat Panel Televisions

1 Answer

Yellow tinge to whole tv screen


if a crt type set a bad solder connection or connections are present at end of the crt on that board there.

Jun 11, 2012 | Philips Flat Panel Televisions

1 Answer

The picture looks like a 3d picture without the glasses.


hi,
If the tv is crt one then you have to check the base socket of the three crt gun, red gun, gree gun, blue gun . If the picture looks out of focus then there is problem with the crt base socket. After a long time of use the crt bases connectros will get corrode and it will not have proper conatct with the connection pins of crt guns. you can see this base sockets in the base board on the neck of crt guns. Remove the base board and remove the sockets and replace with a new one. This will give a good picture. The crt base socket will look like on in the picture


ajin_g_66.gif ok

Sep 23, 2011 | Hitachi Flat Panel Televisions

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My thomson crt tv has lost the blue colour,what could be the cause?


diode on back of crt socket board there should be three test off of crt with dmm diode test unless its labled good luck i hope this helped

Nov 11, 2010 | Flat Panel Televisions

1 Answer

I purchase my TV 02/01/2009. My TV loses picture. During that period, the screen is white. This problem happens at will,and can last up to 30 to 45 minutes, before picture returns.


It is possible that your screen voltage/ grid voltage goes down and so the retracing lines appear with a whittish blank screen. So ypou will need to disconnect th power before opening the set and checking on the HT section. Check for the bias voltage , usually a capacitor of 10mf to 22 mf/250V could be defective. You can loop a capacitor in series and confirm Please use a multimeter to check for voltage in the crt base. An open resistor or partially getting open could also be the case. You can also check for dry or loose connection inthis HT section. I hope you try or seek help if not familiar. Good day

Aug 12, 2010 | Flat Panel Televisions

1 Answer

Thomson 32" flat screen periodically switches on and off very qui


the standby power supply is probably faulty . there is a service kit available but needs to be fitted by a tv engineer and is available from www.tvs-services.com or call 01245382539

Jun 04, 2010 | Flat Panel Televisions

2 Answers

JVC projection TV green timer light comes on, tv turns off


It sounds like your main projection lamp is burned out. They are fairly easy to replace yourself if you can find the lamp at a local repair shop or online. www.projectorlampcenter.com is one, also Fry's Electronics and Best Buy carry a few.

Sep 22, 2009 | JVC LT-40X776 40 in. LCD HDTV

1 Answer

47" Plasma (6 months old)


yes that is electronic drift. the waveform created on the y-sus board is overdriven. you will need an experienced technician to do this for you. be sure to confirm the technician has done this procedure before as leaving it to high or low can damage the tv over an extensive period of time.

Mar 12, 2008 | Flat Panel Televisions

1 Answer

Thomson 27" LCD TV 27LCDB03B


cannot be presise but at worse the lcd back light is failing or the supply to it . this is a job for a service engineer

Dec 02, 2007 | Thomson LCDB 03B 27 in. Television

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