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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 is needed for the ballast. Also the fans and color-wheel are running properly. Is see prices on the internet for this part 526-0090-04 around 261 dollars. Somebody got experience with this ballast? Or is there a cheaper replacement? Where to get? Thanx in advance!

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  • Anonymous Mar 26, 2014

    for defective lamp or if the ballast is defective


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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.

Posted on Nov 11, 2009

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How can test my toshiba tdp-p9 projector ballas? before we order an expensive lamp.the problem is no display, the lamp is off, when the unit is power on.

OK you need sensitive ears. when the unit is switched on and the ballast power supply tries to start the lamp, it generates many 1000's of volts across the lamp to ignite the mercury vapour inside, much like a fluorescent lamp.
When this happens you should hear the snapping spark noise attempting to strike the lamp.
Sometimes it's very faint on some models and quite pronounced on others. It should last for about half a second or so.
If you cant hear it then maybe the ballast circuit or fuse or the 350V DC power feed is dead.
Another way is to have sophisticated metering across the lamp connector pins to detect the presence of the bursts of high voltage.
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Ballast Verification Process
1. Short out door switch (SP001)
2. Apply AC power and wait till DM module boots
3. Press power switch and observe spark gap on ballast
4. If spark gap arcs, suspect Lamp. If color wheel starts but ballast won’t strike
lamp, go to next step.
5. Measure BP252 on AC IN CBA for +300Vdc. If missing check door switch, cable
from AC IN CBA to switch and AC IN PCB. If correct go to next step.
6. Monitor pin 2 of BT251 for Ballast ON command from Light Engine. If present
suspect Ballast. If missing suspect Light Engine. Pin 5 of BT251 starts at 3.3V
after power switch is pressed and drops to .18V when the Light Engine sends the
start command. No change on pin 5 indicates Light Engine is suspect, change
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Note: Lamp may arc but not start. Pin 5 of BT251 is "LAMP LIT" and goes to 1.48V
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Hi there

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The lamp ballast which ignites the lamp has failed it sounds like. The red flashing lamp is the tell tale sign with a good lamp installed. Make sure the lamp door is closed too, there is a door switch that can also trigger the red lamp and no startup. There is a company in San Diego CA that can repair the unit called PROJECTOR DOCTOR

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