TVC LCD AMSTRAD 26” REPAIR CARD

Brand : Amstrad   26”

Model : T2712                                                                               Roberto Salerno

Schematic : not found                                     

Fault : A hint of brightness on switch on  then nothing. 


 When switched on at main I had an indication of brightness; then nothing but the standby  led  flashing  in continuation. Obviously there is no audio.  

These  Amstrad power supplies are well known to  easily  "give up"  after some  time. 

After removing  the  protection cover  I see that the power supply is a   AUO type, a typical instrument adapt for power supply  on  AUO Optronic  LCD panels. 

I  immediately notice  a swelling on the CAP  C355 (1000 F-25V-105°). 

I dislodge  the Power Supply from it's seat  removing the four screws and connectors attached to it.  I replace the CAP with a  higher operating  tension one,  precisely  105°C. 

On these power supplys  it is always advisable to check  the weldings on the various connectors,  I fresh solder any  suspicious ones...…

 I also  replace without delay any suspicious CAPS.  

I reassemble  all and give power to the unit,   after a few seconds of flashing  the  front led (preliminary  bootup phase ) switches on as usual. 

 If it is necessary to replace the power supply  on these Amstrad LCD  instruments  you must choose one with the correct  tension, in particular  those going to the panel. 

 So  if we have a AUO  panel  we must use a  AUO Power Supply  and  if we have a LG panel, we must use a LG power supply  etc...etc.... 

Visually, these power supplys are very similar  but it is dangerous to substitute them.  In particular , if a  LG type power supply  is inserted on a AUO  panel , we  seriously risk  damaging  the panel in a  irreparable way. After keeping it on trial basis I had the unit restored to full operation.