Question about Toshiba Satellite P205-S6337 Notebook

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Intermittant red raster

Red raster comes and goes

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Is it under warranty?

I'd call Toshiba and let them try some stuff with ya over the phone - chances are you have a loose connection to your display, or the display itself may be pooping out on you.

Posted on Jun 16, 2009

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Posted on Jan 02, 2017

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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 | Televison & Video

1 Answer

My sony trinitron kV ES 34M90 GIVES 6 ERROR BLINK CODES


Six blinks - No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis function immediately. Check C515 & 516 and the jungle IC, IC206. To get more details, http://electronicshelponline.blogspot.com/

Nov 28, 2013 | Sony Televison & Video

1 Answer

STAND BY BLINKING LED 6 TIMES


Six blinks - No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis function immediately. Check C515 & 516 and the jungle IC, IC206. For more information go to http://electronicshelponline.blogspot.com/

Nov 23, 2013 | Sony KV-35S26 35" TV

1 Answer

Toshiba CZ32V61 no picture


1) you have problem with the Raster
2) the main causes are a) raster b) picture c) sound d) synch
3) since this are not video, the problem is raster. your must
test the voltage from section horizontal out +125vdc+vertical output +80v+all other circuit +12vdc
4) test the power supply for defective. see the diagram attached

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Jul 12, 2012 | Toshiba CZ32V61 32" TV

1 Answer

Has hi voltage but no raster


Hello
Advance the screen voltage a little and see whether there is raster or not. If not check the voltages at the red, green and blue cathodes of the crt base. If it is almost equal to video supply voltage, check the voltages at the bases of these transistors. It will come normally 1.4 to2.3 VDC. If it is not, ofr very less, replace chroma IC OK.

May 23, 2011 | RCA 32F531T 32" TV

1 Answer

When the set is turned on i can hear the relays engage and thats it red led flashes 6 times


hello No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis function immediately. Check C515 & 516 and the jungle IC, IC206.

shaun

Dec 20, 2009 | Sony KP-57WS510 57" Rear Projection HDTV

2 Answers

MY problem with Sony KP-53S35 53 in. Rear Projection Television. When the TV powers on, the red light blinks until the picture comes on, then the red light blinks go off. I had to wait more than 5 minutes...


the number of flashes of the red indicator lamp points to the possible cause of the delay of the raster or picture, but usually it's an indicator of an emission unbalance between crt(picture tube) guns. the picture will take longer to show up as the emission on either of the picture tubes goes down.

Jul 27, 2009 | Sony KP-53S35 53" Rear Projection...

1 Answer

Crt monitor video chroma processing


first you check the signal cable continuty by multimeter then correct it if faulty .if ok then give -ve click at red cathode on crt base in on condition if red raster comes on screen then red cathode is ok same thing for green and blue cathode if green cathode do not shows green raster after -ve click then crt is faulty then give -ve click at R point at color raster ic which has heat sink if red color comes then ic is ok same thing for green and blue if ic is faulty then replace it if not then check bipolar capacitor if faulty then replace it

Sep 15, 2008 | AOC CT720G 17" CRT Monitor

2 Answers

Pic Bleeding


this sympton is characterized by the presence of red, cyan, green, magenta, blue or yellow colour in a supposedly plain white raster. proper colour reproduction cannot be expected if the raster is coloured. this symptom is caused by a poor white balance adjustment of by a trouble in the CRT, colour amplifier, color demodulation or colour output circuits. if the raster has a tint of red or cyan, check the R-Y output circuits and the first grid, second grid and cathode circuits of the red electron gun. but if you dont know anything about this, just bring it to a qualified service technician. good luck!

Jan 21, 2007 | Sony KV-35S45 35" TV

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