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Sounds could be heared upon switching on of the set but the screen has no raster (means total blackout as if the unit were off. a small red LED located @ the front panel continuously blinks just like the set is initiating its operation but hen it continues to blink though. I also noticed that the filament @ the back of the crt is glowing which I presume that its filament is working normally. The question here is what causes the total blackout of the CRT? How am I going to proceed with checking? What specific circuit will I be checking and what part or parts could posiblly be defective? Any help is greatly appreciated. Thanks... Nichole B. Macasero macasero.nb@energy.com.ph

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Since you said the the pictur tube is glowing, your EHT system is OK.
After selecting a channel if sound is alright the TV up to signal
detection is working OK.

The problem now could be in video amplifier circuits. Check the grid
voltages of the picture tube.
Or switch off TV, and check the resistance values of the resistors
connected to the picture tube pins. Replace the defective resistor.


Check after removing one end of the resitor as it will misguide you if in circuit.

Posted on Aug 23, 2010

  • macasero_nb Aug 26, 2010

    Thank you for the advise, sir...I really appreciate it...I'll have it checked then..by the way what does EHT mean?

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When switched on, the tv screen is black but when switched off, the tv screen blinks.


Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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From your detailed description, it sounds that the main chroma processor IC has damaged. Raster means nothing, but the lighted screen that appears, when a TV is switched ON. For some brands, there will be a blue screen; when there is no signal input, and some others will have a bright white screen with some snow.
I advice you to contact any service technician, to get this TV repaired. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
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shaun

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