Good Day All.
I have a Matsui LM20N2 LCD TV that has a problem with the power / inverter board.
I have been trying to repair this TV on and off since Sep 2008, but I don't have a grate deal of free time, so it's just been put in the cupboard collecting dust.
I did make a post on the eserviceinfo.com forum last year, that post can be found here: Matsui LM20N2 LCD TV - Service Manual or Schematics.
Right down to the problem.
If you power the unit on by the wall socket the stand-by LED will light up, If you then press the power button on the unit it will power up for a max of a second and then go back into stand-by.
I have taken the covers of the back on the unit, and the inverter is apart of the main power board.
If I remove Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, witch are all the same, the TV will fully power up, and stay on with sound, and if you get the light just right you can make out a picture.
Q11, Q12 have failed as they are burnt.
Also one of the two blue caps in the middle of the picture had split.
Q7 - Q14 have thease markings.
H. SD
965
56 HR
So it should be a HSD965 NPN Epitaxial Planar Transistor.
The two blue caps C6 & C7 are marked as.
F .27J
PMD 250V
So is should be a 0.27uf (270nf) 250v cap.
So after replacing the parts the TV still fails to come out of standby so there has to be somthing else worng.
Please can you help and advice how to track down what else might be at fault.
Thanks for your time.
Best Regards.
I have a Matsui LM20N2 LCD TV that has a problem with the power / inverter board.
I have been trying to repair this TV on and off since Sep 2008, but I don't have a grate deal of free time, so it's just been put in the cupboard collecting dust.
I did make a post on the eserviceinfo.com forum last year, that post can be found here: Matsui LM20N2 LCD TV - Service Manual or Schematics.
Right down to the problem.
If you power the unit on by the wall socket the stand-by LED will light up, If you then press the power button on the unit it will power up for a max of a second and then go back into stand-by.
I have taken the covers of the back on the unit, and the inverter is apart of the main power board.
If I remove Q7, Q8, Q9, Q10, Q11, Q12, Q13, Q14, witch are all the same, the TV will fully power up, and stay on with sound, and if you get the light just right you can make out a picture.
Q11, Q12 have failed as they are burnt.
Also one of the two blue caps in the middle of the picture had split.
Q7 - Q14 have thease markings.
H. SD
965
56 HR
So it should be a HSD965 NPN Epitaxial Planar Transistor.
The two blue caps C6 & C7 are marked as.
F .27J
PMD 250V
So is should be a 0.27uf (270nf) 250v cap.
So after replacing the parts the TV still fails to come out of standby so there has to be somthing else worng.
Please can you help and advice how to track down what else might be at fault.
Thanks for your time.
Best Regards.