Question about Toshiba 55H70 55" Rear Projection Television

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How do you the ballast

How do youfix the defective ballast

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Jack South

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How do you know it is bad? i do not EVER recall a bad ballast on a Toshiba. Likely the generic lamp you used will NOT fire--Toshiba sets are VERY particular about lamps. that--or a bad color wheel.

Posted on May 08, 2014


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Lamp does not stay on

You need to find out if it is because of the system control turning off the ballast lamp driver or the fact that the ballast or lamp is not defective measure the connection volts from the mother board to the ballast (NOT THE 350-400 VOLTS FROM THE MAIN SUPPLY RAIL) this will then confirm it may be an over sensitive temperature sensor.

Apr 16, 2013 | ViewSonic PJ860 Multimedia Projector

1 Answer

I have sound to my t.v, but no picture. bulb is good, i read it could be a ballast?

try to check first if there is a voltage input in to your ballast before replacing it. If there is a current going to your ballast and the bulb still not powering for sure the ballast is defective and you can replace it.

Aug 02, 2011 | RCA Scenium M50WH187 50" HDTV

1 Answer

Blue light flashes 5x times for about a minute,manual says bulb,replaced bulb,still doesnt work.

The "bulb" indication means that the lamp has not "fired". This can be due to a defective lamp or a defective ballast. Since you have replaced the lamp, I would next chack the ballast. A professional service shop should be able to help with this. It is extremely rare for a lamp to be delivered defective.

Hope this helps a bit.


Apr 25, 2011 | RCA HD50LPW175 50" HDTV

1 Answer

Red light bkinks, screen goes black for few seconds , picture comes back and then repeats

You have either a defective ballast or a defective lamp. The lamp is the most likely and is user replaceable. If your ballast is defective you will need to contact a service person

Nov 08, 2010 | Sony Grand WEGA KF50WE620 Television

1 Answer

Hi i have a kdf e50 a12u the bulb went so i relaced it and still no picture just keeps flashing green and red any ideas?

Ballast board it is what powers Lamp on.
Encompass Parts Distribution 1-800-638-3328

You need to make sure you do not have any defective Cooling Fans -If Lamp Fan is Defective Lamp will not come on either.But if Fan is running and Lamp Fails to light Ballast board

Sep 30, 2010 | Sony KDF-E50A12U 50" LCD HDTV

1 Answer

Toshiba TDP-P4 Defect Ballast The lamp starts for ahalf a second, just a little flash. Tried a new lamp same thing. I suspect the ballast. Used de service manual and from Power Supply it gets the 5v wich...

the 5v from the power supply is just the signal voltage. the ballast, once ignited, sends about 350vdc to strike the lamp for a few seconds then lowers to 40vdc to maintain it. unfortunately, $261 is a standard price for it.

Oct 02, 2009 | Toshiba Office Equipment & Supplies

1 Answer

When turning power on, nothing happens and then it blinks red five times in a row. KDS R50XBR1

The five blinks indicates a lamp driver failure. The lamp driver is commonly called a ballast. Odd thing is that these set rarely have ballast failure. But the microprocessor in your set thinks the ballast is defective and is rendering the five blink code.

Jul 09, 2009 | Sony KDS-R50XBR1 50" HDTV

1 Answer

My rear projection tv stopped working the lamp has not blowen but the lamp is showing its open circuit with a multimeter. Should it be open circuit? the model of the lamp is 120w BP96-00271C

yes it is high resistance could be your balast... do you hear the arc in the spark gap on the ballast?
if not you may have no power to the ballast as in an open fuse or the ballast is defective or your bulb is defective ..they may not look blown.

Oct 07, 2008 | Televison & Video

1 Answer


The ballast uses open ended high voltage. Both the start current, and the running voltage must be verified.

Normaly the ballast is replaced unless you have the test jigg which is essentialy the specified lamp simulator.

If there is a sensor fault that indicates there may be a potential cooling problem, or an unsafe fault condition (bad socket), or if the lamp is sensed as being defective, the ballast will be shut down.

Jerry G.

Apr 17, 2008 | Samsung DLP HL-P5663W 56" TV

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