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When can i open my computer there a problems, the screen were dispay the bad signal? what will ido

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CHECK YOUR ANTENNA/CABLE INPUT ALSO SEE IF UNIT WORKS WITH DVD ON A VIDEO INPUT. USUALLY IF A MESSAGE OF BAD SIGNAL COMES UP, THE SIGNAL INTO THE RF CONNECTOR IS TOO WEAK OR MISSING.CHECK THE CENTER WIRE OF THE CABLE THAT PLUGS INTO THE TV.

Posted on Jan 12, 2009

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Power went out, now screen shows bad or no signal,


U have cable or a satalite boxes?U have drop incomming signal.Unplug,replug about an hour later,let the boxes reboots,than ur signal will come back.

Jun 14, 2010 | RCA HD61LPW42 61" Rear Projection HDTV

1 Answer

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.
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.
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..

May 20, 2010 | Sony Grand WEGA KFWE42S1 TV

2 Answers

Nec plasma, PXT-42SV1 intermittant picture goes to blank screen.


blank screen do you mean a blue screen or does it go dark

Jun 11, 2008 | Projection Televisions

1 Answer

Broken screen, has crack and only dispays half of screen -42" lcd ilo - what would it cost for a new screen?


you would have to pay for the new panel and the core charge for the cracked panel because the manufacturer will not accept the cracked panel. the manufacturers try and rebuild all parts they get back as cores. i suspect that you could very well need to pay a few thousand dollars. might as well but a new tv.

Apr 18, 2008 | Projection Televisions

1 Answer

Clicking on Blue screen appears then shuts off


The problem sounds to be in the power supply board. May also be a horizontal drive problem. Sorry I can't be of more help, but there are may voltage problems ( shorts, open capacitors, bad chip etc ) that couls cause this problem. The reason the set turns blue when it first comes on is that it doesn't have time ( or can't find a signal and the screen default to blue. Wished I could help more.
Ed
NC Electronic
Mills, Wyoming

Dec 25, 2007 | Sony KP-46WT500 46" Rear Projection...

1 Answer

TV shuts off automatically


I Can Assure You That This Problem Is Associated With 2 Capicators On The Power Supply Board.
 

Aug 24, 2007 | Mitsubishi WD-52725 52". Rear Projection...

1 Answer

No signal or sound but menu comes up


Check for open resistor and shorted regulator on signal pcb (the pcb with tuners on board). let me know if you need more assistance.

Aug 19, 2007 | Sony KP-57WS500 57" Rear Projection...

1 Answer

Connecting PC to sony SXRD with RGB cable no display?


How are you connecting the PC to the TV (ie which input and what type of cable are you using?)

Aug 12, 2007 | Sony KDS-R50XBR1 50" HDTV

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