sony kdl46s4100
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Re: sony kdl46s4100
That model has 2 versions (incompatible - not interchangeable) of main "A" board and Power "G" Board, and 3 possible panels, all with different T-Con boards. 2 versions of the panel are interchangeable with each other, one is not.
I'm guessing you may not have correct versions of boards/have a mis-matched boards problem.Comment
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Re: sony kdl46s4100
A good question to ask too....are all the voltages in respect to their legends?
And, is it possible to see a pic when you turn the TV ON? (Since you said there was no backlight and flashlight or lightsource is needed)
If so, the balancer board (inverter) needs replacement since it is not sending a feedback signal and the main is telling it to shut off (or no BL_ON command) otherwise the fact you have lines appear on the screen indicates the TCON is probably functioning correctly (but that is why I want to see them) and so if none of the above, focus on the main (as said earlier).Comment
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Re: sony kdl46s4100
do you know if a 1 857 093 21 power supply will work with this board, I can't seem to find any info. on compatibility, thanks.Comment
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Re: sony kdl46s4100
I have a solid green light, can not get any blink codes no matter what I unplug from boards?Comment
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Re: sony kdl46s4100
have one transformer on inverter board that reads zero and has a different number on it, the rest read 2.6 on the ohms. nice and sunny here today hows the weather in the u.k.?Comment
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Re: sony kdl46s4100
You mean the balancer baord which has a bunch of small current sensing transformers per lamps. Your TV has power supply/inverter board combo which put out the 2000V for driving the lamps, if the lamp draw too much current, it will send out ERROR (FB) to the power supply to shutdown (High DC voltage on FB pin = shutdown, I believ if it is more than 1.5VDC) the inverter.
Can we see how you measure the resistance of the transformers? We also need to verify if the BL_ON (ON/OFF) is still there when the backlights goes out.
Service manual:
http://elektrotanya.com/?q=showresul...oria=&kat2=allLast edited by budm; 01-30-2013, 11:58 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=24809Comment
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Re: sony kdl46s4100
You mean the balancer baord which has a bunch of small current sensing transformers per lamps. Your TV has power supply/inverter board combo which put out the 2000V for driving the lamps, if the lamp draw too much current, it will send out ERROR (FB) to the power supply to shutdown (High DC voltage on FB pin = shutdown, I believ if it is more than 1.5VDC) the inverter.
Can we see how you measure the resistance of the transformers? We also need to verify if the BL_ON (ON/OFF) is still there when the backlights goes out.
Service manual:
http://elektrotanya.com/?q=showresul...oria=&kat2=allComment
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Re: sony kdl46s4100
The two pin is the primary side which the lamp current will flow through which will create the AC voltage at the secondary side which is rectified by the Diode to put out the DC which feeds the FB pins on CN125. You should look at those two pin to see how much DC voltage you get when you first turn on the TV and when the backlights cut out. If you gorund out the FB pin with 100 Ohms resistor, that will eliminate the Lamp Isense shutdown and the lamps should stay on.
Service manual.
"the one with the different numbers reads zero" What do mean by the different number?Last edited by budm; 01-30-2013, 12:43 PM.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=24809Comment
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Re: sony kdl46s4100
The two pin is the primary side which the lamp current will flow through which will create the AC voltage at the secondary side which is rectified by the Diode to put out the DC which feeds the FB pins on CN125. You should look at those two pin to see how much DC voltage you get when you first turn on the TV and when the backlights cut out. If you gorund out the FB pin with 100 Ohms resistor, that will eliminate the Lamp Isense shutdown and the lamps should stay on.
Service manual.
"the one with the different numbers reads zero" What do mean by the different number?Comment
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Re: sony kdl46s4100
I will look at my board tonight to see what the readings are.
By the way, on the power supply-inverter board, there are two trimpots for Isense trip poin adjustment that was adjusted at the factory for that particular lamps asembly. The service manual dose not provide the adjustment procedures on how to set the properly set point. So if you replace the board, the set point may be too sensitve and causes fault trigger.Last edited by budm; 01-30-2013, 01:55 PM.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=24809Comment
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Re: sony kdl46s4100
ok, thanks, replaced mainboard and tcon, tried a different power supply but it was iffy so put original back in acted the same tho, I read somewhere that after you change a board you have to redo the software or firmware but not sure if thats right, I looked at sonys site theres no firmware or update available for this tv that I could find, thanks.Comment
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Re: sony kdl46s4100
Sometimes the main boards will have to be set to the particular panel it is going in but a picture should still appear. TCONs are usually replaced with the panel (in the case of a panel replacement) but again, even if there was some adjustments needed, there should still be some sort of OSD.Comment
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Re: sony kdl46s4100
Sometimes the main boards will have to be set to the particular panel it is going in but a picture should still appear. TCONs are usually replaced with the panel (in the case of a panel replacement) but again, even if there was some adjustments needed, there should still be some sort of OSD.Comment
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Re: sony kdl46s4100
but I always turned it off before plugging cn303 back in for safety, thanks.Comment
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Re: sony kdl46s4100
The two pin is the primary side which the lamp current will flow through which will create the AC voltage at the secondary side which is rectified by the Diode to put out the DC which feeds the FB pins on CN125. You should look at those two pin to see how much DC voltage you get when you first turn on the TV and when the backlights cut out. If you gorund out the FB pin with 100 Ohms resistor, that will eliminate the Lamp Isense shutdown and the lamps should stay on.
Service manual.
"the one with the different numbers reads zero" What do mean by the different number?Comment
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Re: sony kdl46s4100
I will look at my board tonight to see what the readings are.
By the way, on the power supply-inverter board, there are two trimpots for Isense trip poin adjustment that was adjusted at the factory for that particular lamps asembly. The service manual dose not provide the adjustment procedures on how to set the properly set point. So if you replace the board, the set point may be too sensitve and causes fault trigger.Comment
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Re: sony kdl46s4100
OK, this power supply board has pullup resistor built-in on the BL_ON control pin, which is connected to the main board, the main board will pull this line LOW to keep the backlights off, so when you remove CN303, the backlights will come on, this is how you find out if the inverter is working or not by pulling the CN303 as long as the power supply suppling the B+ to the inverter circuits is OK. So if the backlight stay on without going offf when you remove CN303, it means that your inverter/balancer/lamps are OK, the problem is then in the main board. You can see the BL_ON signal is fed to Q703 ON PAGE 47 of the service manual.
That is why on my post 28 I indicated that we need to check the BL_ON pin.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=24809Comment
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by dkneyleDiagnosed this TV as having a failed main board which I've replaced with one from a KDL 55HX850. They are (supposedly) the same board.
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