I have a PT AE900 as well.
The service manual containing circuit diagrams can be found online. (Let me know if you cant find it)
A few years back i got the vertical stripes problem, however it went away in the 30 seconds while i was looking at it and thinking WTF.
I never saw that problem again.
If you can't get it soldered and buy a new IC instead i would be interested to know how it works.
The service manual says you're supposed to connect the RS232 cable and run service software to tell the projector you have changed IC1053 1055 or 1057. (Dunno why, might be calibration data or chip versions)
And no one seems to have this service software
I've done two repair jobs on my AE900.
- Few months after i bought it (2ndhand) the green driver IC (IC1055) developed an internal short on the 5.5V gamma control pin (LCCOM) which feeds the raw green LCD panel.
It was just a static 5.5V which the chip adjusts only when you change the green gamma on the OSD so i just forced it back to 5.5V with resistors to nearby power rails.
I also cut some plastic out of the top and thermal epoxied some bent copper strips as extra heatsinking
http://www.avsforum.com/t/1029165/pt-ae900-no-green-fix-mod-warning-technical- 5 years later it just switched off while watching a movie and displayed "temp" and "lamp" leds.
After a cool down and reboot it would seem to turn on (light changes to green) but no picture would display. You could see the fans twitch when you hit the soft power button.
I tracked that fault to a open circuit diode on the power board
(The P-Module in the service manual diagram, it was the bottom diode on the cold side).