Electrohome Marquee Series

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CLM/Microprocessor board

Below is a picture of the CLM or microprocessor board. This is where all of the control functions of the projector take place. The pix below is of a Marquee 8110. There are slight differences between the 8000, 8110 and 8500 control boards, but the functions are the same. The main difference between the 8500/9500/9000 control boards and the other models is that the higher end units have a second daughter board installed for the astigmatism (or ‘Stigmator’ as Electrohome calls it) as outlined in the red rectangle below. Without this board, the astigmatism controls in the service menu become disabled, however the set will still function.

As with the HDM board, the daughter boards can develop bad contacts and cause intermittent operation of some functions or projector power-up. Socketed chips on this board can also get bad contacts. To reseat the chips, simply push down HARD on each chip so that it sits firmly in its socket.

The memory battery on the board can go bad. This is a lithium battery that measures 3 volts. If the battery voltage drops below 2.8 volts, you stand a chance of losing the convergence memory without warning, or the set may have erratic operation.

The rear panel of the CLM shows error LEDs that give a hint as to where the problem in the set lies. Most of these error codes are straightforward, H fail for a bad horizontal board, V fail for a bad vertical board, etc. AS with any other set however, the LEDs are not perfect indicators of all fault conditions in the set, so here’s some other errors that I’ve found with the Marquee sets:

Error lights sequentially flashing back and forth- bad connection on a chip on the CLM board
Multiple LEDs on, indicating possible multiple board failure- caused by a bad VIM (RGB input) board.
No picture, but no error lights on- This can be due to any board being bad in the set. There are a number of circuits that will shut down the HV power supply which will cause no picture, but you may not see an error light on the back of the set. Failure of the HV section in the set will also not be indicated on the CLM board error LEDs.