A friend has two large Plasma screens with burned out power supplies.
He's a Broadcast Maintenance Engineer at a 24 hour news channel and can

fix any electronic equipment if he has a schematic or can identify the
parts.


These units are NEC PX-42VP4A


Does anyone have a schematic, service manual or insight into where to
get the following part, BLQH, which looks like a surface mount
transistor or what the equivalent parts is?

NEC has been unresponsive to requests for a service manual or
schematic.


Thanks all

You will need to contact an NEC authorized servicer as they are the
only ones that can get the service manual.

Even if they will loan or sell you the service manual, you will not get
any schematic.
All repairs on the NEC ones are board level replacement as long as they
are still being supported by NEC.

Many times a well experienced technician in the arena of SMPS repairs
does not need a schematic to perform the basic troubleshooting on any
SMPS to get started.

They of course, are not supported by NEC having been supplanted by an
improved model that doesn't fry power supplies.

No luck with NEC. Wish someone knew what that surface mount 3 pin BLQH
really was. Looks like a small transistor. Everything else is pretty
straight forward.