Toshiba P503DL service manual Appendix-3, When lamp does not light, Hen lamp does not turn on

E	Input E		VNE
F	Input F		VNF
ADJUST	Exits ID MODE (return to ADJUST MODE )	AJS	AJY
ID.SEL	Select ID		IDT

Appendix-3

Trouble shooting hints

1.When lamp does not light

a.Lamp will turn on but shut-off by itself within a short period of time

This is one of the symptom when the lamp becomes to its life end. Intensity becomes low, lamp gap becomes wide, thus ballast power supply voltage becomes not enough to sustain the charge. the lamp needs to replace.

b.Lamp bursts

This is another phenomenon when lamp comes to its life end. Th e internal pressure becomes high and lamp breaks, lamp will not turn on, this is clearly the end of lamp life.

c.Lamp will not turn on

This is also another style of its end of life. When the gap between electrodes became wide, even high voltage ignitio n will not start the lamp discharge. This is another possibility. In this case, if carefully observed, lamp ballast will make noise while start ignition trigger is supplied, if this sound can be hear, then ballast is most possibly OK and lamp is wrong.

2.W hen lamp does not turn on

a.There are several possibility even the lamp is new. When one of the Fan stop its rotation, the motor sensor stop sending signal and CPU will turn of the lamp power to avoid heat going up by no airflow inside.

b.When Color wheel motor is stopped, then motor rotation signal becomes missing, then this change also sends to stop lamp power.

c.Lamp door open, this condition also shut off the lamp power.

3.When color becomes strange

a.Electronic circuit break down will lead for such color difference, key components are DMD drive

st

board and I/O control board. 1 trial may be exchange the Control board to try out.

b.At the time when color wheel motor may not synchronize to the incoming signal, there is a possibility to have different color or color flicker happens. If motor makes noise, then this is most possibly motor bearing needs oil. If motor becomes difficult to have smooth rotation, the color changes sometimes and comes back, then repeat this color change. The motor replace needed most possibly.

4.When picture is strange and totally distorted

a.There may be a possibility that some strong noise entered and micro-processor jammed. One of the easiest way is to shut off rear rocker power switch and wait for some period of time as one minute, then turn it on. By waiting such time, micro-processor will totally reset and possibly restart without any difficulty. This is caused by CPU jam by noise.

b.When some difficulty happened on reset or original program start at DMD drive circuit, the picture may not be right or also I/O control board. Try replacing these boards one by one.

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