ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hello,
My Beovision 7-40 mkII have problem :
- no screen/sound
- active standby diode is okay
- if I active "TV" button with beolink (press a lot of times insisting), led screen post "TV" 2 seconds
- if I open DVD, reading time is different if I take DVD or Bluray (not understand Bluray)... I guess it makes the difference in reading between the 2 DVD / BD formats.
- CPU rom is okay (voltage value is okay)
The B&O shop says "there are no more parts"...
All PCB are good, but main chassis PCB 999 have defaut (with help founded : https://elektrotanya.com/bang-olufsen_beovision7-40mkiii_type_9370_9384.pdf/download.html)...
I opened TV with a friend who knows about electronics. We observed :- thyristors have instables values > I have changed full thyristors- Now thyristors values are okay- 2 inverters of 3 are not value, but no smell and no visual problems - 2 transformers of 3 are not value, but no smell and no visual problemsWhat do you think ? Thank's a lot for your answer
Nobody knows about this failure?
Can someone tell me if the service manual is offered complete (sliver member) , with measurements of all components?
The full Mk2 service manual is available, but I have had a quick glance through and it is mainly concerned with 'fault flow charts' (with test measurements) which then tell you which module/PCB to replace.
Thus I think it may help you may identify the fault and faulty board, but not the specific component.
Hi,
Thank's a lot for your answer, but I have the same service manual. I have found fault... Thyristors are changed in the PCB 999 : The motherboard. But I don't have inverter measurements... Nothing serial... Inverters are problems...
It's impossible to change inverter without measurements...
Hi!
Did you resolve this?
Br Christian