My projector is not powering up, I have a problem with the GA board. They are hard to come by so i was trying to isolate the problem on the board.
I seem to be blowing one or all 4 of the 2SC3163 transistors after about 10 minutes after power up. It happened twice already.
Anyone have an idea on what to do or test?

Here is what I did so far.
All I have is a DMM with a diode tester so I cannot do any extensive testing.
I took out and tested all components in the two primary circuits: transformers, diodes, resistors, and capacitors for obvious shorts, or open circuits. Did find the resistor with about twice the resistance as color code was indicating. None of the caps were shorted.
So i replaced the set of 4 resistors R601,602 and R605,606. They were all supposed to be 460Kohm, but one was 1100Kohm. I was hoping that would be it so I ordered another set of 4 transitors(Q603,Q604 horizontal and Q601,Q602 vertical scan circuits). But unfortunately, Q604 blew up again after about 5-10 minutes.
As far as the capacitors, I orderd a few 160V33uF, and a 160V100uF but they are substantially smaller in size. Should I try to use those or is there any other measurement to go by when ordering caps?
Petar

The ratings for capacitors are voltage (V), capacitance (uF), equivalent series resistance (ESR) and tolerance which can be rated 1%, 5%, 10% or 20% but is not as important as the first 3 ratings unless it is in precision equipment.

You also need to make sure you use the right type, if the ones you are replacing are the metal can type (electrolytic) you need to use those, don't try and use other types like tantalum etc.

Ok thanks, I got the electrolytic aluminum capacitors which match the type being replaced but the new once are considerably smaller. Is that ok or not?

Ok thanks, I got the electrolytic aluminum capacitors which match the type being replaced but the new once are considerably smaller. Is that ok or not?

At least that 100uF160v cap is "high ripple" model, those new caps can be "normal models" but these days caps are smaller anyway..
I have used cap that is found in sony tv sets, allmoust any 25-29" trinitron has that 100uF160v cap and it is just that "high ripple" one.
Remember that i´m not saying that new caps you have doesent work, they might work just well..

I've been looking at the schematic for the 1031QM which should be the same as the 1031Q and it shows that R605 should be 220k. If you have the correct schematic you may want to verify that.

macgyver655 thanks for your reply. I think the circuits might be different
the original r605 and r606 had yellow, purple, yellow and silver(tollerance)
The other pair of yellow, purple, yellow are r601 and r602. So those are 470K
I replaced them with the 1/2W equivalent resistors.

Which resistor measured 1100k that was suppose to be 470k?

try to remeber, I think it was R602.
Definately 100% sure that it was one of those two r601 or r602. They should be equivalent

Measurements were done with the resistors out of the board.