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Equipment Repairs => LCD TV forum => Topic started by: scooby-doo on November 25, 2011,14:39:43

Title: Samsung LE46M86BDX...Intermitant Fault
Post by: scooby-doo on November 25, 2011,14:39:43

Hi....again

I have this TV and it has an intermitant fault...When you sometimes turn the TV on the backlights illuminate and the TV shuts down again...it looks a little like an inverter transformer fault..the trouble is if you leave the tv for 5minutes and plug it in there is no problem and wont be another fault with it, could last for 1 day or 2 weeks before it does it again.

I have checked for dry joints everywhere and all seems to be ok...the only thing someone maybe able to advise me on is on the "Left" Inverter (SSB460WA22L-Rev 4) has a random transformer middle of the board....I cant get any readings out of the dam thing...apart from that I am screwed

As always any pointers much appreciated

Title: Re: Samsung LE46M86BDX...Intermitant Fault
Post by: jimca007 on November 25, 2011,15:23:05

hi theres a previous post I made a while ago that had a lift from the service manual detailing how to by pass the lamp out error circuit you could try giving that a go....

Title: Re: Samsung LE46M86BDX...Intermitant Fault
Post by: scooby-doo on November 25, 2011,15:43:15

Cheers Jimca

Ive just been through all your posts and cant find anything regarding the bypass.

I will have a search on yahoogle for the bypass and if I get stuck will give you a shout

Thanks again

Title: Re: Samsung LE46M86BDX...Intermitant Fault
Post by: jimca007 on November 25, 2011,16:04:19

" You can drive the circuit by force when LCD panel lamps or invereter is faulty by connecting pin 2 of the connector going from the main board to the PSU (CN1101 ) to pin 4 of the same connector "

in other words short over pins 1 and 2 of the main board to power supply connector

Title: Re: Samsung LE46M86BDX...Intermitant Fault
Post by: scooby-doo on November 25, 2011,16:17:23

Sorry for sounding stupid but is this a permanant fix..or will I have a little samsung fire when/if the inverter goes tits up.

Title: Re: Samsung LE46M86BDX...Intermitant Fault
Post by: jimca007 on November 25, 2011,16:28:33

Strictly speaking its in the software as a servicing aid to allow you to identify which coil set or tube is going down however that said your not by passing the fuses or fire resistors so i wouldnt imagine fire's a possibility i would think it far more likely the invertor will eventually short out a mosfet and blow the fuse if indeed there is a fault but their temperamental sets and seem to go into fault mode all too readily when no significant fault is apparent.

Title: Re: Samsung LE46M86BDX...Intermitant Fault
Post by: scooby-doo on November 25, 2011,17:07:21

Cool thanks for that advice