sony KDL-46S4100 proper voltage

[nomoresonys]

have a quick voltage question, I'm getting 11.54 coming from the a board goes down to 11.30 volts at the tcon, and still no red standby on front just steady green, no video or audio, black screen, is this proper or do I maybe need a new lvds cable, any ideas, Thanks.

[sordids999]

Re: sony KDL-46S4100 proper voltage

https://www.badcaps.net/forum/showthread.php?t=39740

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

thinking 11.30 v at the tcon isn't enough to make it display.

[budm]

Re: sony KDL-46S4100 proper voltage

Most T-CON operating Voltage range is +/-10%.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

don't know where to measure the standby voltage, can't see the stby printed on board anywhere, sorry no pics., no access to camera, thanks.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

Most T-CON operating Voltage range is +/-10%.

ok, so I'm good with 11.30, does it seem strange that it goes from 11.54 to 11.30 at the other end?, THANKS.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

I have the service manual and see the test points for the a board but not sure how to test it.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

got a rebuilt a board from shop jimmy, then 1 from ebay, 1 gives me what looks like the age pattern when bl-on wire is unplugged the other just gives two different solid colors with bl-on unplugged, all the voltages from the connectors on g board test good, solid green light on front, no red standby light on front, flowchart says if volts are right at g board replace aboard but also says if no menu at all seen, and proper voltage at tcon, replace t-con, tried 3 t-cons, if not that it says bad panel, would I get back light if panel is bad?, THANKS.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

wonder if I could do a factory reset without being able to see the menu?

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

only other thing I can think of, it might need the firmware replaced but no firmware for this model on sony website.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

I'm thinking a power surge during a storm borked my firmware???

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

got different a board, have strange condition, with lvds cable unplugged from a board side only, get backlights on in about 8 seconds, with lvds unplugged from tcon side only, no backlight at all, any ideas?, THANKS. trying to post pics., having some trouble, will keep trying.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

some pics.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

some pics.

sorry bout the poor pics., best I could get out of this 5mp camera.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

got different a board, have strange condition, with lvds cable unplugged from a board side only, get backlights on in about 8 seconds, with lvds unplugged from tcon side only, no backlight at all, any ideas?, THANKS. trying to post pics., having some trouble, will keep trying.

when unplug bl-on connector from g board, get 2 red blinks on front but I think it's just because it's unplugged, when plugged in the blinks go away and theres no red standby at all.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

would like to test everything on the a board and tcon that I can with dmm, can't seem to find any good pics. or videos on the subject.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

if all the voltages at my plugs on the g board are correct, does that usually mean I can rule out the g board?, thanks.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

been reading the manuals, can't figure out why I have no red led standby on front, just steady green, anyone know what to check on g board or elsewhere, when no red standby on front?, getting proper voltages at g board to a board plugs, tried testing cn1 read 000 on 200 and 750 acv, unless I'm testing it wrong.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

tested it wrong, there is 122v at cn1.

[nomoresonys]

Re: sony KDL-46S4100 proper voltage

I was thinking there's supposed to be a red standby light on front, when tv is off and plugged in but none of my working tvs have that, it must be normal.