@zanzel4 could be power board or ballast issue. Make sure that the lamp door is properly replaced. There is a lamp enclosure cover sensor, if the sensor is not depressed all the way, your set thinks the cover is missing and you will get the lamp error code as well. Once you get it back on try see if this works for your set:
After completing the lamp replacement, enter the Service Mode
Press the remote control Keys in the following sequence:
“Power off ➔ Mute ➔ 1 ➔ 8 ➔ 2 ➔ Power On”
The Service Mode Screen appears in 15 ~ 30 seconds.
(1) Select 7(OPTION) with using the joystick downward, and then select the LAMP CLEAR with using the joystick in the displayed menu.
(2) Press the + key to select LAMPCLEAR OFF.
(3) Press the + key, LAMPCLEAR CLEAR is displayed in the screen.
(4) Exit factory mode.
If it does not, post some images with your original question (use this guide) of your boards and what your set looks like since there are different ways of testing the boards etc. Of course the set worked before you replaced the lamp?