Hi Graham
No, I'm not familiar with this chassis, but I do wiring and electronic diagrams mostly and fix power stuffs all the time. I've seen some interesting PS units which first do Power Factor Correction and then switching power supply. They're plenty of ICs and they will fill all of our devices in short because of their excellent low harmonic performance.
Perhaps you may send a coupe of good pictures of them with remarked numbers on. I could try to help you on this.
you may send them to electron1999 at hotmail.com
Please send the HPT4240 (Badged LG model) PSU schematic. This may help too.
Regards
John_H
Quote:
|
Originally Posted by Graham Robinson
Hi John, thanks for the response. Do you actually know this chassis? , this
set has 2 very large power boards in it , simply marked SP-2000 power 1 and
SP-2000 power 2. Both boards are made by SM-TECH Korea.
Its difficult to say which PWM circuit is in use as there are so many
individual power circuits on these 2 boards. ...
Graham
|