LG 32LB5600 Won't turn on and no standby light

[arman960]

I need help with fixing my 32 LG LED TV. Model 32LB5600 It wont power on at all. No standby light on bottom front also.

I checked the voltage on the pin on power board output. I get 3.5v at the 2nd , 3r pins from the bottom up. I do not get any other voltage reading.

The BGA chip on the main control board gets very hot.


Can someone tell me if my power board is defective or my main control board shot?

[budm]

Re: LG 32LB5600 Won't turn on and no standby light

OK, you do have 3.5 Standby Voltage to run the main board and when you turn on the TV with remote or with the power switch on the TV, then main board should hen send out the commands signals to turn on the rest of the power supply and circuits.
<1VDC = OFF, >2.5V or so = ON
PWR-ON = PS-ON to turn on the rest of the power supply
P-DIM = PWM Dimming control of the backlights
DRV-ON = BL-ON to turn on the backlights

If you do not have those command signals then you have problem with the main board.

[dick_barton]

Re: LG 32LB5600 Won't turn on and no standby light

Disconnect the power supply from the mainboard. Power up and see if the backlights come on.
If they do not then connect a 1K resistor from 3.5V to PWR_ON and a second 1K resistor from 3.5V to DRV_ON. Check that the backlights come on that you also have 12V & 24V supply.

[arman960]

Re: LG 32LB5600 Won't turn on and no standby light

Disconnect the power supply from the mainboard. Power up and see if the backlights come on.
If they do not then connect a 1K resistor from 3.5V to PWR_ON and a second 1K resistor from 3.5V to DRV_ON. Check that the backlights come on that you also have 12V & 24V supply.

Thanks for your quick reply and suggestion. I shorted drv-on and pwn-on with 3.3v. Back light came on.

All the voltages were present also. 12v and 24v.

So seems like power board is ok.

Is there any way I can repair the mainboard? any suggestion?

[dick_barton]

Re: LG 32LB5600 Won't turn on and no standby light

So the power supply has been proved to be OK and you said that the BGA chip on the mainboard gets really hot although they do normally run hot. The mainboard is not sending out the control signals to power on and bring on the backlight on so it does look as though you have a dead mainboard.

[tw2005]

Re: LG 32LB5600 Won't turn on and no standby light

Sounds like the LGE2121 chip has shorted. I managed to use a Hot Air Station to replace one a few weeks ago. Same size but 2132 chip. really small pitch but I got lucky. About $16 USD I got the chip for mine.

Also found that a 42, 50 " board would also run a 55 no worries over here in fact I tried to get a brand new board. told no longer available, given a substitute board number also NLA and that was a 47" model,

so may mean the same for your region maybe also for a 32 but can't be sure but it makes sense as the TCon drives the panel.

Great panels, poor backlights, burn out or lenses fall off.

You can use an eeprom read/writer to transfer the old data across like run hours, serials, model number etc.

[tw2005]

Re: LG 32LB5600 Won't turn on and no standby light

butif this works, cheap. Looks like there's another version TV with a different main board too.

https://www.tvpartstoday.com/EBU6230...bu62302402.htm

[paulstef]

Re: LG 32LB5600 Won't turn on and no standby light

Sounds like the LGE2121 chip has shorted. I managed to use a Hot Air Station to replace one a few weeks ago. Same size but 2132 chip. really small pitch but I got lucky. About $16 USD I got the chip for mine.

Respect! So these are not programmable ICs? I have a mainboard with a burned (literally) chip too I would try to replace then

[tw2005]

Re: LG 32LB5600 Won't turn on and no standby light

Respect! So these are not programmable ICs? I have a mainboard with a burned (literally) chip too I would try to replace then

Doubt it but all I can report is chip off, chip on, board fixed. Running daily in the bedroom.

Where have you been hiding?. I'm stuck on a LG Plasma PSU failure you didhat video on,

[tw2005]

Re: LG 32LB5600 Won't turn on and no standby light

Oh, something I thought of too, you can disable the standby LED in the menu. May have been why you have no light. Gave myself a scare when I was playing with the eeproms, lost the light thought it was broken until I hit the button. Obviously I'd carried across the setting with the flash.

[arman960]

Re: LG 32LB5600 Won't turn on and no standby light

Bought one main board from online store. I will post the result. Thanks everyone for all the suggestions.

[paulstef]

Re: LG 32LB5600 Won't turn on and no standby light

Doubt it but all I can report is chip off, chip on, board fixed. Running daily in the bedroom.

Where have you been hiding?. I'm stuck on a LG Plasma PSU failure you didhat video on,

Good I will try that too then. Thanks
You could open a new thread for that plasma.

[tw2005]

Re: LG 32LB5600 Won't turn on and no standby light

Good I will try that too then. Thanks
You could open a new thread for that plasma.

Yes , I think Iwill. there's plenty on that particular model but nothing but dead ends.

[arman960]

Re: LG 32LB5600 Won't turn on and no standby light

Installed main board that I bought, the tv came alive. I think this is very common problem for this model.