- Ballast Fire Up (which then turns the lamp "on")
- Ballast sends electronic pulse to DMD
- If PASS - Go to Next Step
- If FAIL - Shut Down TV (3 Lights Blinking)
7 - DMD Receives OK from BALLAST - Send VIDEO to screen
Digital Board controls the digital functions of the TV (On, Off, Menu, Etc)
- Blinking Menu - MOST LIKELY bad Digital Board
- TV Turns on by itself when plugged in - MOST LIKELY bad Digital Board
- TV Won't Turn off or is non-responsive to buttons or remote - MOST LIKELY bad Digital Board
Digital Board is responsible for processing and descrambling the OSV (On-Screen VIDEO, does NOT include Menu System)
- Menu is OK and Video is bad, DMD Board is MOST LIKELY GOOD and Digital Board has bad DNIe Chip
**Here is where some technicians make a mistake... The Digital Board produces the on-screen menu, but it does so using a separate memory chip! It does not use the DNIe chip for menu functions! This is why we test the OSM (on-screen menu) to diagnose... Even though the Digital Board produces this menu, it does not process it or pass it through DNIe Chip.. DNIe chip is what converts the ANALOG video to DIGITAL with some enhancing, upconverting, etc. When we press menu and the menu shows up fine but video is scrambled, this means the DNIe chip or one of its related components is failing. The MENU Function are on a separate path to the DMD board and are not decompressed, compressed, or decoded in any way (Direct to Display).
DMD Board is responsible for ultimate video output
- TV is scrambled (lines or blackouts) - MOST LIKELY BAD DMD Board
- TV won't turn on and Color Wheel is GOOD, Temp sensor is GOOD, Ballast is GOOD, and TV won't power - DMD is not sending 5VDC out to Ballast ---- DMD is MOST LIKELY bad
Quote from another forum and what appears to be a good tech.