Samsung LA40R81BD Fault
Hi all,
I took the following pics of this unit straight after switching on, and over a period of about 20 seconds. The hashy pattern flickers on and off till it reaches what you see in the 3rd pic.
The tv soon switches itself off then restarts and repeats.
I read through this post :
I replaced the 5 caps. They were not physically damaged at all, but I knew from the other thread that it's better to change them anyway.
Will a bad IC1803 create this symptom ?
or am I looking for something else ?
Loopy
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Last edited by loopyloo; 07-01-12 at 08:31 PM.
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yes can do
Symptom : : No Power, keeps clicking, colours incorrect, No DTV / ATV. No DTV or RF signal on TV.
- SMPS capacitor failure causing No power or No DTV to above models.
This is due to Eeprom value in Factory setting change when SMPS failure (side effect)
go back to that post and get the settings for LA40R81BD enter service mode and cheq them all
chriss
loopyloo (08-01-12)
link to my original post with service information relating to this model range is linked below. Like CHRISS said check the settings make sure they are the same as what is listed for your model.
service info
If it's not the eeprom, either the tcon board or main tuner board will be faulty.
Mick
Last edited by mickstv; 08-01-12 at 08:19 AM.
Righto then, now I just need a remote.
Does anyone have one laying around to buy / borrow ?
Looks like this.
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Are you still chasing a remote ?. If so PM your postal details & I will send you one.
LeroyPatrol (09-01-12),loopyloo (09-01-12)
Message sentOriginally Posted by mrfish
I've just ordered the chip.
In the mean time I thought I'd do a little testing.
At this stage, now that I've changed the caps, the hash on the screen doesn't flicker or gradually increase the hash as it did before. It just goes immediately to a full on hash pattern. By hash, I don't mean snow. It's a digital pattern. I'll try and post a photo tomorrow.
So, I desoldered pins 5 & 6 and turned it on.
Black screen but the set didn't switch off.
The main blue lamp in the middle of the tv flashed about 5 times I think, maybe that's a hint.
Resoldered the pins back and it's still the same as before.
Veerrry Interlesting.
Loopy
only had to change the Eeprom when set wont turn on, when set turn on and just bad colour or lines or no DTV ext just need to reset the Eeprom settings
Chriss
I didn't get to take a photo today.
Chip will be here tomorrow, then I'lla be bahck
Loopy
Replaced the chip yesterday.
On first start up it did do a fair bit of clicking before the display light up.
Unfortunately, the next picture tells the story.
It also does the on, off cycling about every 15 secs. , coming back to this screen each time.
I have a sneaky suspicion that if the set was left off for a long time to completely discharge that it would go back to what it did in the first 3 pics post#1, and end up like this pic again. I would have to wait a long time to prove that, or, do you think if I lay a sheet of aluminium foil over the boards and rub my hand over it to attempt to discharge everything (after discharging the big caps of course) ?.....Don't know what I'd gain out of it, just another test I guess.
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Last edited by loopyloo; 12-01-12 at 12:36 PM.
There is one thing I forgot to mention.
After replacing the chip, the tv also had the sound working again.
Think would get lot of static on chips lol
just wate for the remote and check Eeprom if setings ok then can go to Tcon or main pcb to check out
chriss
Ok...Remote came today. Many thanks to MrFish.
Tried service mode but the screen looks the same as in post #10...bummer.
Loopy
Where do I go next ?
I know this is a 7 year thread
I am having the same issue with my la40m81bd doing this exact same fault by the sounds of it
caps where replaced first
tv lasted a few weeks and came back with this fault
heres a video T-Con has been tested with another t-con so that's been ruled out
ic1803 erased with a programmer
tv now clicks on and off every 30 - 2 mins still displaying this pattern of static.
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