lg flatron w2286L problem

[vagos_89]

Re: lg flatron w2286L problem

I tried to take better pictures. In the point of 5V i have 4,75V. It would be useful to take and write the measurements of test points like VCC, VDD, VGL,VGH etc?? Thanks

[bammbammfran]

Re: lg flatron w2286L problem

You could try changing it
Just be careful in this area and near the ribbons

TO selldoor: he had 5.1 on two voltage regulators on the main board
(post 8)

Posts crossed -
Try checking the 5v before it gets into the ribbon on the main board side.. you might be losing some via ribbon contacts

[selldoor]

Re: lg flatron w2286L problem

TO selldoor: he had 5.1 on two voltage regulators on the main board
(post 8)

Yes I know, that is why I was asking him to look for a testpoint near the
socket on the mainboard and on the panel board to see if 5v is leaving the
main board and getting to the panel board, which you have now repeated.

He could also try testing on the actual socket pins - its usually the end 1 or 2 that carry the 5v , but if he slips it can do more damage than good.

@vagos_89 You could take the measurements at the other test points you mention but I am not sure how many regular members we have who can interpret the results.

[selldoor]

Re: lg flatron w2286L problem

Had another look at the pics there is a VIN test point near the socket so that is where you need to test for 5v - looks like there is a fuse so you could test each side of that.
Looks like the end 4 pins on the socket carry the 5v If you see that also then it would be safe to test as you are unlikely to slip across 4 pins . Hope you are being careful anyway as the connections to the panel can easily be damaged.

[bammbammfran]

Re: lg flatron w2286L problem

there is a vin pin on the t-con side
but I do not see one on the main side
and
It is 3 pins !! Do not use the last pin on the t-con side (that connector on the t-con has an extra pin on each end)

[vagos_89]

Re: lg flatron w2286L problem

I'll leave for the moment the other measurements. 5V is leaving the mainboard of the 3 last pins(5,1V for accuracy) also i have 5,1V in the edge of lvds cable. When i plug the lvds to the tcon board i have 4,8V in the 3 last pins of mainboard and also 4,8V have to the 3 last pins of tcon board connector(i don't use tha last pin of the connector as you told me, there i have 0V). I guess this is a problem. Should not i have 5,1V after the connection of lvds to the tcon?
Also 4,8V i have to VIN point and each side of the fuse.
Thank you both!

[bammbammfran]

Re: lg flatron w2286L problem

can you give me the part number of the circled part and what voltages are on the 2 pins and the one tab when the unit is power on and when it is powered off

[vagos_89]

Re: lg flatron w2286L problem

can you give me the part number of the circled part and what voltages are on the 2 pins and the one tab when the unit is power on and when it is powered off

Sory but i don't understand "when the unit is power on and of" Do you mean when i plug and i unplug the lvds to tcon or when i power on and of the power button of tha monitor? I think is the second but i want to make sure.

[selldoor]

Re: lg flatron w2286L problem

I suggest he means when it is plugged in but not switched on
Then test again when it is switched on.
As we are troubleshooting the lvds I would also test it with the panel connected and also without. If in doubt cover all bases - cant do too many tests

[vagos_89]

Re: lg flatron w2286L problem

The part number is 06N10-225L AD T95B. Switched off and panel not connected: gain->0V, drain(tub)->12,22V, source->0V. Switched off and panel connected the measurments are same. Now switched on and panel not connected: gain->0V,drain->12,19V, source->0V and and switched on and panel connected: gain->3,027V, drain->11,8V, source->35mV

[bammbammfran]

Re: lg flatron w2286L problem

the 12v isn't dropping too bad.

is the power supply a 12 or a 19V (I saw one place that said it was 19 ??)
is it the original
is it a mini size or decent size like some laptops use ?

That 3.3 voltage regulator on the tcon running high output may be what is draining the 5 volts down, but I am trying to cover all the bases before trying surgery

[vagos_89]

Re: lg flatron w2286L problem

the 12v isn't dropping too bad.

is the power supply a 12 or a 19V (I saw one place that said it was 19 ??)
is it the original
is it a mini size or decent size like some laptops use ?

That 3.3 voltage regulator on the tcon running high output may be what is draining the 5 volts down, but I am trying to cover all the bases before trying surgery

The power supply is 12V 3A. Yes is the original. As i said in previous post the 5V leaving the mainboard of the 3 last pins and reaches in the edge of lvds. When i plug the lvds to tcon this voltage reduced. This mean that the broblem is in tcon board?

http://www.emtcompany.com/lg-lcap07f...101323354.html

[bammbammfran]

Re: lg flatron w2286L problem

ok
seems like that supply should be ok
Those small ones tends to not have enough amps

A voltage drop is not uncommon when something is added into a circuit, I just do not know how much this exact system should drop.

I guess that trying the voltage regulator would be the next thing.
In case you can not find the original richtek That is a positive fixed 3.3volt 1 amp sot-223
Looking at it with the tab on the left. the input is on top output in the center and ground on the bottom pin. The large tab and center pin are together

If it comes out in tact, it can be checked with a 9 volt battery by hooking the battery to the input and ground and then checking the center pin. These have a 15 volt max on the input so you could also use the 12 volt supply

[vagos_89]

Re: lg flatron w2286L problem

Because i'm not too good in english :P. To understand, you suggested me to remove the RT9141A regulator and test him? Thank you for your time and trying both