LG 37lv375s no 24V

[R_J]

Re: LG 37lv375s no 24V

I would start checking that inv_on line back to the main board

[chrle]

Re: LG 37lv375s no 24V

I would start checking that inv_on line back to the main board

how?

[R_J]

Re: LG 37lv375s no 24V

Follow the wire back to where it comes from, then check the components, If you look at the service manual it does give some direction where to look, search the manual for inv_on or inv_ctl etc. to follow the path

[chrle]

Re: LG 37lv375s no 24V

Follow the wire back to where it comes from, then check the components, If you look at the service manual it does give some direction where to look, search the manual for inv_on or inv_ctl etc. to follow the path

I found this manual

[chrle]

Re: LG 37lv375s no 24V

think I found what I need

[chrle]

Re: LG 37lv375s no 24V

Problem is on mainboard....

[chrle]

Re: LG 37lv375s no 24V

I will try to reflow main processor...

[budm]

Re: LG 37lv375s no 24V

You can try forcing on the backlights circuit by disconnecting the INV_ON (BL-ON) wire going back to the main board first then use 1K resistor between BL-ON pin and standby power supply pin to force the backlights on, if the backlights are on but you do not see any video, or sound, or other functions then it has more than just the BL-ON controlling problem.

[chrle]

Re: LG 37lv375s no 24V

Ok guys I replaced main processor ,volltages are same...

I will try forcing backlight with 1k resistor

[neilc6]

Re: LG 37lv375s no 24V

Did you replace the processor or the main board. LV series has bga issues.

[chrle]

Re: LG 37lv375s no 24V

Did you replace the processor or the main board. LV series has bga issues.

yes I replaced with new processor

[nomoresonys]

Re: LG 37lv375s no 24V

Ok guys I replaced main processor ,volltages are same...

I will try forcing backlight with 1k resistor

Did you do this?

[chrle]

Re: LG 37lv375s no 24V

Did you do this?

no, I am going to electronic store to buy 1k resistor, I have low ohm resistors at home.

[chrle]

Re: LG 37lv375s no 24V

ok guys it turn on backlight with 1k resistor

but no picture or sound

[nomoresonys]

Re: LG 37lv375s no 24V

Looking like a mainboard fault.