How to make LVDS test under 99 cents

[budm]

Re: How to make LVDS test under 99 cents

"55' Samsung LED TV won't can on , unplug power cable to mother board , back light come on" That is one way of finding out if the power supply/backlights are OK or not, they (Samsung) installed the pull-up resistors (for ACTIVE HIGH) for the PS-ON and the BL-ON into the power supply board so the tech in the field does not have to rig up two external resistors to test the power supply and backlights circuit, save them time in the field. Samsung has done that more than 3 years ago.

[Peter Chiu]

Re: How to make LVDS test under 99 cents

Emerson 32-37 CCLF TV did that to ,It is white flat cable near the ballast. unplug them screen light up, I think Sanyo did that too... really tough day on Monday, always.......see U

[Peter Chiu]

Re: How to make LVDS test under 99 cents

still working on resistance to current converter circuit

https://www.google.com/search?q=resi...ed=0CAYQ_AUoAQ

[budm]

Re: How to make LVDS test under 99 cents

Which one are you trying to make the LVDS driver or the LVDS receiver?

[Peter Chiu]

Re: How to make LVDS test under 99 cents

This one ( LVDS signal current detector).

[budm]

Re: How to make LVDS test under 99 cents

You mean the receiver.

[Peter Chiu]

Re: How to make LVDS test under 99 cents

An ESR meter: is measure the equivalent series resistance (ESR) of real capacitors.
So I need a resistance to current converter circuit, to convert ESR meter to my LVDS current detector.

[budm]

Re: How to make LVDS test under 99 cents

ESR is basically AC Ohm meter that forces high frequency current through the cap, the frequency has to be high enough so the Xc of the cap will not have an affect to the reading of the cap ESR.
You are trying to detect the LVDS signal generated by the main board so you need the receiver with 100 Ohm termination (you have 3.5mA of current from the Driver that force the current through 100 Ohms to produce 350mV of signal at the diff input of the diff amp). Since you have lot of T-CON board around, so you can use the receivers on the T-CON.
LVDS is just diff amp with 100 Ohm termination at the input, then you take the output to drive some kind of indicator circuit.
https://cdn.badcaps-static.com/pdfs/...8a1abbe8ae.pdf

[Peter Chiu]

Re: How to make LVDS test under 99 cents

Good idea....I'll try it...and back to U.

[jarapunga]

Re: How to make LVDS test under 99 cents

Hi there. I need to ask how to tell whether an LVDS cable is 6,8 or 10bit by just looking at it. Same goes for the whether it's 1 or 2 channels? What do you count, the twisted pairs? Sorry I realize this is an old post but I am tempted to ask anyway. Thanks. I am especially referring to LCD/LED TV LVDS cables.

[cferry7]

Re: How to make LVDS test under 99 cents

Hello Peter Chiu and budm.

Just wanted to let you know that I have enjoyed reading this thread and that I find it quite interesting !

I may have some questions for the both of you on a LCD Panel project that I may be attempting in the near future.

In appreciation.
Username : cferry7