sony kdl46s4100

[nomoresonys]

Re: sony kdl46s4100

just a black screen with cn303/bl on plugged in, can't see anything with flashlight, no menu, just black. With cn303/bl on unplugged, no lines, just the solid red green blue and r g b w striped screen, that is the test mode it's stuck in, I guess, can't hardly get pics. of screen it has no base and unstable to move with back off, thanks.

tried two 1 857 092 11 boards, didnt work either, and one other tcon, unless I need an exact number match tcon for this A board.

[nomoresonys]

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.

any way to tell which number tcon? goes with S040FHD 0752-3 48.71H01 .031, 5571H01411G819263E3J03C thats the one sj sent me, it should be a good one, they said it was rebuilt, thanks.

[nomoresonys]

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).

all the voltages on ps check out, and I have 12 v at the lvds cable on the tcon side, not quite sure how to check the A board voltages but its a rebuilt board.

[nomoresonys]

Re: sony kdl46s4100

any way to tell which number tcon? goes with S040FHD 0752-3 48.71H01 .031, 5571H01411G819263E3J03C thats the one sj sent me, it should be a good one, they said it was rebuilt, thanks.

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.

[nomoresonys]

Re: sony kdl46s4100

I have a solid green light, can not get any blink codes no matter what I unplug from boards?

[nomoresonys]

Re: sony kdl46s4100

I think the power supply has a problem.

[nomoresonys]

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.?

[budm]

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=all

[nomoresonys]

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=all

yes balancer long thinner board on the left, has 21 small transformers, the one with the different numbers reads zero, the rest read 2.6 ohms, it has 4 prongs on one side and two prongs on the other, am just measuring the side with two prongs, thanks for your time.

[budm]

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?

[nomoresonys]

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?

10 of them are labeled 1055r-a834j, 10 are 1054n-a834j, the the one in the picture on the green part of the board is 1045c-a834j thats the one with 0 ohm reading, the rest are 2.6, thanks.

[budm]

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.

[nomoresonys]

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.

[drpj23]

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.

[nomoresonys]

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.

when I unplug cn303 from power supply, I get backlights and the red green blue then r g b and white striped screen over and over, when plug cn303 back in nothing just black screen, no menu and nothing seen with flashlight on screen, thanks for help.

[nomoresonys]

Re: sony kdl46s4100

but I always turned it off before plugging cn303 back in for safety, thanks.

[drpj23]

Re: sony kdl46s4100

That probably is a Sony test procedure...such as some Samsung's can be disconnected from the main to test if the backlight works.
But, I suppose right now we are going to have to wait on budm and see what he can find.

[nomoresonys]

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?

the backlights dont come on unless I unplug cn303 from power supply, should I check them with cn303 plugged in or out thanks, sorry to be such a noob.

[nomoresonys]

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.

did not replace balancer board, the thin one on the left with all the transformers, am trying my original and replacement main and tcon boards tho, thanks.

[budm]

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.