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Hitachi CMP307XE

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delphi:
Hi,

This unit is dead. I found 2 chopper transistors dead. These were duly replaced.

Switched unit on, standby red light lit for 3 seconds before tripping the building trip fuse (Apparently this is a design feature of the unit) Now the unit doesn't go into standby, it just trips the fuse. Checked the following components, Bridge rectifier, Triac, Chopper transistor (associated with the standby circuit) Output rectifier diodes for standby supply. I'm thinking of checking the filter capacitors on the primary side of the psu, but in the meantime, does anyone know of any stock faults?

Unfortunately, the service manual does not allow repair to component level, so I've basically been using my own logic gained from repairing CRT smps.
Thanks for any help, maybe the filter caps are faulty, will let you know when I get around to checking them.

cueboy:
bin the thing he he

delphi:
Maaged to repair the PSU 2 transistors SC. A1884 and C3851, had to use sub BD909 for C3851.

But, that's not the end of it. The monitor and fans power up, green light lit, but the display is blank.

Any ideas? Apart from the bin it idea.

Thanks

delphi:
Ouick update, I've studied the service manual, which has more info than I first thought. 5v line is missing, so out with the PSU, again!. I will let you know what happens.

delphi:
5v line wasn't missing, the service manual has the wrong info on it!! Turns out the main 180v line is missing. As the choppers have been replaced, I'm looking to replace the FA5304A driver chip.

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