Question about Samsung HC-P4752W 47" Rear Projection HDTV-Ready Television

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Samsung TV The TV has no picture but with sound and "raster". It needs a lot of shifting channels and time before the picture could come in. What seems to be the problem?

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What colour raster it seem like you got the coolling oil inside the picture tube leaked out is typical from Samsung to confirme your problem you should open the back of your rear projector and look if you see any sight oil or liquide on the PCB printer circuit board if yes it require an technician to remove the PCB and clean this oil if not too much damged and install 1 modifications kit if no oil leaked you might have problem in high voltage it call deflection PCB part No.BP94-01259G or L you still need to adjust convergence after replace a new DEF PCB require Technician level 1
Cheers

Posted on Nov 30, 2008

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1 Answer

Do you need to connect cable to get a picture


You should be able to get to the setup menus of the TV and/or get some static if you have no signal on an off-air channel. No picture/no sound points to the power supply board of the TV being faulty.

Nov 02, 2009 | Samsung HCN4226W 42" Rear Projection...

1 Answer

Signal Problem


Hi,

When the sound is working and the picture is not it indicates the main power supplies are working but the picture supply is not. The picture supply that powers the projection tubes is a high voltage generator and is very expensive to repair. Not even most tv techs now how to troubleshoot them. So, I cannot recommend you repair it yourself unless you are a trained high voltage tech.

The cost of repair - my wild guess - would be around $300. However, the real cost can only be determined by someone who can make an accurate diagnosis - which will require a hands-on approach the problem.

If you have any other problem please ask me..
Goodluck,
Please don't forget to rate me as fixya..

Feb 09, 2008 | Projection Televisions

1 Answer

Turn off after a few hours


If the TV turn itself off then perform the following steps:

(i) Check if the Sleep timer is activated.

(ii) Check if the Parental Guide prohibits viewing during that time and/or limits amount of viewing time per day.

(iii) Check the batteries on your remote, low battery power may cause random signals from the remote.

(iv) Disconnect all the cables from the TV then reconnect them after a few hours.

(v) Ensure the power cord from the TV is directly connected to a functional wall outlet.

(vi) You may also try resetting the TV to the original factory settings by pressing the Reset button on the remote control supplied with the TV when in Menu.

The following is the information indicated by the blinking patter of the standby/timer lamp on the TV:

2 times : Power does not come on.
Load on power line shorted.

3 times : The TV has entered standby mode.

4 times : Has entered standby state after
horizontal raster.
Vertical deflection pulse is
stopped.
Power line is shorted, or
power supply is stopped.

5 times: No raster is generated.
CRT Cathode current detection
reference pulse output is small.

6 times: No picture

9 times : No sound

Furthermore, the TV is equipped with a self-diagnosis function that you can use to determine whether the issue is related to any hardware malfunctioning. Perform the step given below to run self diagnosis:

Quickly press the remote command button in the following order from the standby state.

Display -------> Channel 5 ---------> Volume -(minus) --------> Power ON.

If the Self Diagnosis display numeral "1" for any parameters then a fault has been detected and service will be required.



wish u good luck!!!!!!!!!!

Sep 17, 2009 | Sony KP-65WS500 65" Rear Projection...

1 Answer

IM A TV TECH. I HAVE A SONY LCD KP-60XBR800 I HAVE NO RASTER. POWER OK, MENU OK BUT NO RASTER ON TUNER, TUNER VOLTS OK,CAN YOU HELP ME PLEASE. THANKS my email sergioaguirre0182@hotmail.com


check the high voltage with the screen control turned up high where there is no raster. suspect problem within the video circuit where there is no high voltage or defective picture tube.some time when the screen is black and the screen control advanced,you can see if the tv has video or vertical or horizontal problems on the screen.service the high voltage circuit if there is no raster or high voltage is seen.no raster can be caused by the no heater or filament in the CRT.---- a defective picture tube can cause many problems, such as, poor brightness ,missing colors,intermittent picture,poor focus,a single-colored raster,arching in the gun assembly,retrace lines in the picture,negative picture,chassis shutdown,noheater or filament lit and no raster to name a few.an open filament or heater can cause no picture or no raster symptom.a defective CRT can have an extremely bright screen.loose particles of the cathode element can lodge between the grids and cause an intermittent black and white picture. simply tap the ends of the CRT gun assembly and notice if the picture begins to flash off and on.---- with a leaky picture tube after turn on the raster dims and get extremely bright.a dim picture with no green in the raster can result from a bad green assembly. a heater-to-cathode short can cause a raster to change colour or a result in no raster at all.replace the picture tube if there is severe arching in the neck of CRT. excessive brightness with retrace lines and a vertical collapse to a thin line can be caused by a bad coil on the neck board of the picture tube.rejuvenate the picture tube when there is very bright green screen. check for the resistance change on the resistors of the CRT neck board for an excessively bright picture with retrace lines.excessive dust inside the CRT spark gaps within the picture tube socket can cause the very bright raster and the chassis shutdown.a defective video amp,luminance buffer,or reference transistor can cause a bright picture with retrace lines. -------- for getting any required parts to replace you can get it from www.radioshack.com or from www.partstore.com or from www.shopjimmy.com --------- thanks.please do rate the solution.thank you for using fixya.keep updated.

Sep 06, 2009 | Projection Televisions

1 Answer

No sound no raster


Unplug your projctn. tv. Open the rear end and try to locate the power fuse near the power plug, it's made up of small cylindrical glass. Replace it with same rating as labeled on the fuse itself. ;-)

May 24, 2009 | Samsung Projection Televisions

2 Answers

With sound but no video only raster with vertical lines


The resistor (r9335) on the blue crt base board is open and burned thats why the 200v is missing. replacing the resistor will solve the problem. cheers!

Apr 08, 2009 | Sony KP-FX532M91 TV

1 Answer

No picture at all,sound ok 3 tube crts off after 4secs when on


might be a crooked flyback transformer, first check for shorted transistors around the transformer and components at the horizontal output stage..

Mar 31, 2009 | Philips Projection Televisions

2 Answers

Rca projection tv has no picture or osd


Check the bulbs. If one is burned out, you will get this problem. The bulb is easy to change but will run you about $300.

Feb 10, 2008 | Projection Televisions

1 Answer

Picture freezes Black/White


It's most likely the digital board, Samsung p/n# Bp94-00385a but I'd trace test both the digital and analog first before blindly replacing it - too costly to just guess..
Bill

Dec 08, 2007 | Samsung HLN437W 43" Rear Projection HDTV

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