Can i replace the scaler board in my projector

if the lamp, lamp driver,power supply,Scaler Board and Formatter Board were good.
perhaps it is over temperature protection.
whether you checked with the air filter( dust filter) is clean or dirty?

sent me a copy of the schematic

Generally this problem is in your signal board. You may also know it as the scaler board, as you mentioned. I have not repaired this particular model. But I would first suspect the the signal board (scaler). If you are not sure what this is, it is the board with all the RCA Jacks and RF connections. The problem in this area are bad or failing capacitors. Thanks for asking and show all hands of support!

Yes you will need to replace the faulty IC /component in this board or replace the board. Since you have got only the possibility of the board being a suspect it will be good to check if you are familiar with electronics with a signal check to determine the fault.
If not the cost of the board must be estimated before you decide to source /service at Philips.

Is this a DLP or LCD projector?

I bought a Scaler board from someone on eBay but it did not fix the unit however I'm not sure the replacement was not a dud. I planned to send the board to PTS Corp but haven't yet. I have sent other boards to PTS wit good success. http://www.ptscorp.com/tech_support.html

if the unit is out of warranty try reseating the LVDS cable. that is the cable that joins the panel to the scaler board inside the set. becareful when removing the cable, don't pull from the wires but remove from the connector. reseat the connector a few times. if this does not solve your problem then replace the scaler board better known as the SSB

the fact that you have on screen display tells me that you are on a blank digital channel, or input with no signal. check to see if this is so on all of your inputs DVD, VCR, Cable, Sat box... if there is no signal still, replace the scaler board.
here's the four basic components to a LCD tv.
1. panel. there is on board electronic inside not componet level repaired.
2. power supply. this feeds power to the unit 5V, 24V, and 15V. the 5V is the standby voltage while the 24V supply the inverters.
3. the inverters. this is a DC to DC inverer used to light the lamp. these and not component level repaired.
4. the scaler board. this is the board that runs the show. it sends the signal to the panel to paint the picture.also sends commands to the power supply to turn on the inverters. this board is definatly not component level repaired. most all of the boards can not be repaired at the component level, power supply may be the only one, but not all power supplies can be.
there is one other part to the set that does have failures and that is the cable connecting the panel to the scaler. this is the LVDS cable. sometimes just reseting the cable can solve many problems.
so based on this info your panel is working because you have onscreen display. your iverters are working because without the lamps you would not see the on screen. your power supply is working because you have inverters working. and the only thing left is the scaler this provides the on screen so we know that it is at least partly working.

Depending on when you bought this TV, this could be the lamp. Does the red light below the green light come on? (That's the lamp light). This light typically comes on around the 3rd year of use for an average individual. I've recently enountered the same problem and will try to replace the lamp myself. Apparently its very simple.

BEAD 100MHz at 120ohms

Part# 242254945333