Picked up a non-working Sony Bravia 40" LCD Model KDL40S4100 today FOC. Cleaned it up, checked for physical damage, and then powered it up: power light came on, snow on screen for a couple of seconds followed by blank screen and standby light flashing twice. I haven't opened it up yet but wondering if anyone has any ideas on the best way to short circuit (!!!) the fault finding process. Thanks in advance. This is my first LCD TV although I have done a few computer monitors in the past. And this is my first post here so take pity on me
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Sony Bravia 40" LCD Model KDL40s4100
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Re: Sony Bravia 40" LCD Model KDL40s4100
Service manual:
The bad part for this model: from page 11 of the service manual
IMPORTANT:
The units in this manual DO NOT contain a self-diagnostic function. If an error occurs, the TV will not stay on. It is our
is required for this set, the technician should bring both the A Board and the G Board to the customer location.Last edited by budm; 10-17-2012, 12:15 AM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Sony Bravia 40" LCD Model KDL40s4100
Originally posted by budm View Post.....
The bad part for this model: from page 11 of the service manual
IMPORTANT:
The units in this manual DO NOT contain a self-diagnostic function. If an error occurs, the TV will not stay on. It is our
is required for this set, the technician should bring both the A Board and the G Board to the customer location.
Oh well, I guess I'll know more when I open her up I've never worked on anything that needs this much bench space before.
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Re: Sony Bravia 40" LCD Model KDL40s4100
I believe me/Sienoki have this same model with bust screen, but all parts working.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
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Re: Sony Bravia 40" LCD Model KDL40s4100
Yes. I can't remember if it's "S" or "W" we've got, but the boards may be good for either.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
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Re: Sony Bravia 40" LCD Model KDL40s4100
So finally got some time to take the back off and start looking around. No obvious capacitor issues or burned out components or previous repair attempts. I'm going to do some voltage and continuity checks shortly and check the inverter board. In the meanwhile, here are a few "interior" shots.
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Re: Sony Bravia 40" LCD Model KDL40s4100
Originally posted by jimb0b View PostPicked up a non-working Sony Bravia 40" LCD Model KDL40S4100 today FOC. Cleaned it up, checked for physical damage, and then powered it up: power light came on, snow on screen for a couple of seconds followed by blank screen and standby light flashing twice. I haven't opened it up yet but wondering if anyone has any ideas on the best way to short circuit (!!!) the fault finding process. Thanks in advance. This is my first LCD TV although I have done a few computer monitors in the past. And this is my first post here so take pity on me
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Re: Sony Bravia 40" LCD Model KDL40s4100
I would remove the balancer board and look real close at the sockets where the board is attached to the lamps, see if the black sockets have any sign of over heat or blister, look and clean the fingers of the board also, insert the board back in and see if the lamp will stay on.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Sony Bravia 40" LCD Model KDL40s4100
I checked the voltages on the test points behind the transformers and they ranged from 0.1V to 0.4V except one which was 9.1V (see picture). So I figure I have the problem. The next question: is it the transformer or the ccfl? Any ideas on how to figure that out?Last edited by jimb0b; 10-24-2012, 08:23 PM.
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Re: Sony Bravia 40" LCD Model KDL40s4100
Success! I removed the transformer which showed the abnormal voltage, soldered in a jumper and up she came! Using OTA signal, it picked up 12 high def stations immediately. Now all I need to do is find a remote for it.
BTW, the efffect of removing that ccfl is practically nil. With any picture on the screen, you absolutely cannot see the difference. When there is a blank screen, it can be noticed from acute angles and then only if it is mentioned.
Here are pics of the final result (Craig Ferguson interviewing Susan Sarandon tonight) and a picture of the repair.
Tks everyone for your help and advice.
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Re: Sony Bravia 40" LCD Model KDL40s4100
Great job locating the cause of the problem. By the way, what resistance reading on the transformer you removed compared to the other transformer? It looks like the transformers are hooked up in series with each other.
Other person on the forum had the bad connection problem with the PCB sockets so you may also want to keep an eye on that. I will take some resistance reading of spare SONY balancer board's transformers.Last edited by budm; 10-25-2012, 09:17 AM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Sony Bravia 40" LCD Model KDL40s4100
Norcal715 with similar problem on a Samsung: http://www.youtube.com/watch?v=oE6K4xBVweA&feature=plcp
I think he diagnosed it as a failed CCFL, not transformer.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
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Re: Sony Bravia 40" LCD Model KDL40s4100
Originally posted by budm View PostGreat job locating the cause of the problem. By the way, what resistance reading on the transformer you removed compared to the other transformer? It looks like the transformers are hooked up in series with each other.
Other person on the forum had the bad connection problem with the PCB sockets so you may also want to keep an eye on that. I will take some resistance reading of spare SONY balancer board's transformers.
As I had no way to decide whether it was the transformer or the tube, I decided to pull the transformer to see if a) it would work at all and b) everything else is working. So far, everything else seems fine although I don't have a remote for it so it is a PITA to change settings etc. So that is the next job: find a remote Sony RM-YD025 or compatible model.
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Re: Sony Bravia 40" LCD Model KDL40s4100
Originally posted by tom66 View PostNorcal715 ...... http://www.youtube.com/watch?v=oE6K4xBVweA&feature=plcp
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Re: Sony Bravia 40" LCD Model KDL40s4100
Ah, so the lamp is bad, not the transformer. Thanks for the link to the YouTube, learning something every day, 1200 hours and the lamp already failed, sad.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Sony Bravia 40" LCD Model KDL40s4100
Originally posted by budm View PostAh, so the lamp is bad, not the transformer. Thanks for the link to the YouTube, learning something every day, 1200 hours and the lamp already failed, sad.
Is it possible to remove and replace a ccfl?
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Re: Sony Bravia 40" LCD Model KDL40s4100
I had the same problem with my Sony KDL-40S4100. Go green then a couple seconds later Standby light would blink twice.
I unplugged the main connector on the inverter board and left the smaller connector on the bottom connected. The tv came up and stayed on no pic just sound.
I pulled the inverter board off very carefully using a plastic wedge tool on the outer side. I found that the third tube up from the bottom connection was broken off. At first I thought why would a circuit that is not drawing anything cause a shutdown. I checked all of the coils went back to that one and yep it spiked. I took a look at the video on U tube.pulled the board and removed the coil and jumped out the 2 outer pins.
Picture came up and I cannot see the missing tube.
Thanks for the info and the link to the video, it helped out a lot.
RJ
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