Hi!
Well, after I repaired my LG plasma a friend of mine called me to take a look at his old plasma TV. It's Excello 42B43, a BEKO rebrand with Panasonic plasma module, 2005.
TV worked fine until recently he moved it to another house. After relocation TV worked for day or two and than died. TV was serviced two times long ago, there are some visible signs of lousy service job on secondary PSU ;-)
When plugged in TV gets no standby light, no remote or any other button response, but screen has a little background glow.
There are two PSU's inside. The bigger one on the left side is Panasonic PSU, part of their plasma module, and smaller one on the right side made by Beko (model: Beko-PSU-03).
After taking it apart I noticed blown fuse on secondary PSU. Secondary PSU (smaller one) made by Beko supplies low voltages to main video I/O board (+5V/+12V, standby, etc...)
There was visible solder job at left upper corner, two caps, bridge rectifier and one small IC was replaced before. I did some cleaning and resoldering because the big cap at the corner was little bit loose, installed new fuse, plugged it in, relay clicked and after few seconds fuse exploded.
Now, I found schematics for this particular PSU, poked a little bit with multimeter and ESR meter, can't find anything shorted or bad...
I believe the problem is on the primary side of PSU. If it's on secondary I doubt fuse should explode like this.
What do you think?? What plasma module type is it, btw?
C1031, C1024, D1001 bridge and IC1004 were replaced before. What is IC1004 (FSD200) for?
Attached schematics is for Beko-PSU-03 (pictures: Beko_42B43_PSU_01.jpg and Beko_42B43_PSU_02.jpg)
Cheers!
Suad
Well, after I repaired my LG plasma a friend of mine called me to take a look at his old plasma TV. It's Excello 42B43, a BEKO rebrand with Panasonic plasma module, 2005.
TV worked fine until recently he moved it to another house. After relocation TV worked for day or two and than died. TV was serviced two times long ago, there are some visible signs of lousy service job on secondary PSU ;-)
When plugged in TV gets no standby light, no remote or any other button response, but screen has a little background glow.
There are two PSU's inside. The bigger one on the left side is Panasonic PSU, part of their plasma module, and smaller one on the right side made by Beko (model: Beko-PSU-03).
After taking it apart I noticed blown fuse on secondary PSU. Secondary PSU (smaller one) made by Beko supplies low voltages to main video I/O board (+5V/+12V, standby, etc...)
There was visible solder job at left upper corner, two caps, bridge rectifier and one small IC was replaced before. I did some cleaning and resoldering because the big cap at the corner was little bit loose, installed new fuse, plugged it in, relay clicked and after few seconds fuse exploded.
Now, I found schematics for this particular PSU, poked a little bit with multimeter and ESR meter, can't find anything shorted or bad...
I believe the problem is on the primary side of PSU. If it's on secondary I doubt fuse should explode like this.
What do you think?? What plasma module type is it, btw?
C1031, C1024, D1001 bridge and IC1004 were replaced before. What is IC1004 (FSD200) for?
Attached schematics is for Beko-PSU-03 (pictures: Beko_42B43_PSU_01.jpg and Beko_42B43_PSU_02.jpg)
Cheers!
Suad
Attached Files
!
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