LA40 M81BD combo PSU inverter

[vinceroger69]

Re: LA40 M81BD combo PSU inverter

saw this on another site maybe worth a try

The tuning sequence is
Turn on TV and put it in the DTV mode by pressing the source button on the Right Hand Side of the TV till you are in DTV
Mode ( if not tuned in it will say “no signal” ) then press the
menu button on the TV again and the “D” menu will appear , go down to channel , hit enter, the start will be highlighted on
Screen, hit enter again then the tuning process will start wait till it is completed full tuning 100% you will see a picture in the
Back ground of the menu just hit menu button on the TV twice
and the TV will exit the tuning mode. Now you can use the TV with the remote control.

this android app may let you get into the dtv menu
https://play.google.com/store/apps/d...ities&hl=en_GB

[maxvalutech]

Re: LA40 M81BD combo PSU inverter

Thanks vinceroger69 and the tuning is as you say for tv but in this case dtv just does not show. None of the other inputs are selectable on this tv - unless they are cable connected to another unit they are just greyed out.

[maxvalutech]

Re: LA40 M81BD combo PSU inverter

Well good news for a change a fair bit of research via this and other forum led me to a Samsung Service Bulletin of April 2010 covering the whole problem with what caps needing replacement, how service menu would be corrupted and what to change, as well as Eeprom replace if needed. Took the plunge on service menu and changes resulted in plug and play bringing up dtv tune in. Thanks for all contributions.

[syaoran123]

Re: LA40 M81BD combo PSU inverter

Nice work. I assume you no longer have the power up issue. Did you only change the filter caps(the electrolytic caps) ?

[maxvalutech]

Re: LA40 M81BD combo PSU inverter

Yes the switch on is normal now and the caps replaced were the four originally done. I have one problem in that av. inputs give a washed out picture but my fault as in service menu I looked at calibrate and saw av failure come up so seems I had finger problem and pushed the wrong button. HDMI is ok though.

[tom66]

Re: LA40 M81BD combo PSU inverter

Yes the switch on is normal now and the caps replaced were the four originally done. I have one problem in that av. inputs give a washed out picture but my fault as in service menu I looked at calibrate and saw av failure come up so seems I had finger problem and pushed the wrong button. HDMI is ok though.

Check the picture mode setting for these inputs. When the EEPROM corruption occurs some of the picture modes can be corrupted, try changing that and see if the picture looks better.

[maxvalutech]

Re: LA40 M81BD combo PSU inverter

Thanks tom66 there was a slight improvement but seems like I have to input via usb probably a white/black checkerboard pattern then do the service menu av calibrate. But may not worry about it as av virtually died out now.

[syaoran123]

Re: LA40 M81BD combo PSU inverter

Cool. So even when u followed the instructions in that doc, u still get image discoloration?

[maxvalutech]

Re: LA40 M81BD combo PSU inverter

Yes but I believe that when resetting service menu I inadvertently entered recalibrate av resulting in failure due to no correct input for the calibration. The av inputs had been working ok beforehand. Then again I have little knowledge of what the various service menu settings are all about !!