LG 55EC930V power supply problem

[Teletoby]

Re: LG 55EC930V power supply problem

take new one and compare the Vlose % & ESR... replace it. if the PWB still no 12 24V replace the PWB. the issue at same section with some SMT component. such Q , the problem we cant find replacement parts.

ok... i have to check if i have some spare parts with this values.

[budm]

Re: LG 55EC930V power supply problem

When you force on the power supply, are you getting the PFC Boosted Voltage of around 380 ~ 400VDC as measured between the two legs of the main filter caps? The 12V/24VS and 24VD SMPS require that Boosted Voltage to work.
https://www.shopjimmy.com/lg-eay6334...5ec9300-ua.htm
https://assets.shopjimmy.com/media/c...348801-top.jpg
https://assets.shopjimmy.com/media/c...801-bottom.jpg

[Teletoby]

Re: LG 55EC930V power supply problem

When you force on the power supply, are you getting the PFC Boosted Voltage of around 380 ~ 400VDC as measured between the two legs of the main filter caps? The 12V/24V SMPS require that Boosted Voltage to work.

I have to check that hold on...

[Teletoby]

Re: LG 55EC930V power supply problem

I have to check that hold on...

i've measured 318VDC and after a few seconds the relay starts clicking and clicking

[budm]

Re: LG 55EC930V power supply problem

i've measured 318VDC and after a few seconds the relay starts clicking and clicking

So when you force on the power supply board you only get 318VDC and the power relay is also clicking, correct? You need to check to see if the standby power supply output is also going up and down in sync with the relay clicking or not.
BTW, can you read the printing on the power relay RL101?

[Teletoby]

Re: LG 55EC930V power supply problem

So when you force on the power supply board you only get 318VDC and the power relay is also clicking, correct? You need to check to see if the standby power supply output is also going up and down in sync with the relay clicking or not.
BTW, can you read the printing on the power relay RL101?

The voltage collapses when the relay starts clicking.

[Diah]

Re: LG 55EC930V power supply problem

You need to check to see if the standby power supply output is also going up and down in sync with the relay clicking or not.

good point budm

The voltage collapses when the relay starts clicking.

let start with disconect load on 12 24 V SMPS. solder out or take out complete the 6 of them with heat sink HS10

[Teletoby]

Re: LG 55EC930V power supply problem

good point budm



let start with disconect load on 12 24 V SMPS. solder out or take out complete the 6 of them with heat sink HS10

Which one exactly do you mean? Do you have the Numbers?

[Teletoby]

Re: LG 55EC930V power supply problem

good point budm



let start with disconect load on 12 24 V SMPS. solder out or take out complete the 6 of them with heat sink HS10

Ah i think i found them... Yeah i will solder them out and check them

Its D251-D256

[Teletoby]

Re: LG 55EC930V power supply problem

I've disassembled the HS10, and i checked them. This is the average value of all of them.

[Diah]

Re: LG 55EC930V power supply problem

can you show us your measurement equipment?

[Teletoby]

Re: LG 55EC930V power supply problem

I have a TrueRMS Multimeter Unitest Hexagon. A universal component tester. A Weller Soldering station. Unfortunately my Osci got lost during i moved.

[Diah]

Re: LG 55EC930V power supply problem

ok.. dont do the second short contact as the pdf.. only the first one.. never do now the second one... we need to focus to have the 12 and 24 v on socket 201 and keep all 6 diode out now

before that check the Fuse which goes to the transformer T104 and read the voltage of it when you just plug in. the - should be primary section chasis

[budm]

Re: LG 55EC930V power supply problem

C503, 504 are filter caps for running the STBY SMPS, C503, 507, and 513 are for running the relay, 12V/24VS SMPS, and 24VD SMPS so I would check them all at this point.
Q501 is the relay driver.

[marcoecca]

Re: LG 55EC930V power supply problem

hi guys i'm new on this forum and i'm an italian engineer. i wanted to let you know i'm fixing the same defect and if you want i can tell you what i'm trying to fix on this pwb. I have already repaired the 24 volt 20 amp section of the panel power supply. I replaced the L5699ad controllers and the 2nd stage I solved it. now I miss the 12volt section and 24 volts at low current, because despite having replaced everything, I'm still with this section locked. how can I find out something? I'll let you know. ps this TV turned off while they were watching it, and not because of lightning or other problems. it is a recurrent fault but I have to find out the problem because, even if with 100 euro I could replace the pwb, I don't feel like putting it aside but I want to find the real problem, to then make you participate and help the other technicians without having to lose too much time behind to carry out the repair. sorry if I followed the discussion but being new, I still need to get acquainted with your group. I'm using google traslator to translate and I apologize if in some cases there will be misunderstandings. thanks

[Teletoby]

Re: LG 55EC930V power supply problem

hi guys i'm new on this forum and i'm an italian engineer. i wanted to let you know i'm fixing the same defect and if you want i can tell you what i'm trying to fix on this pwb. I have already repaired the 24 volt 20 amp section of the panel power supply. I replaced the L5699ad controllers and the 2nd stage I solved it. now I miss the 12volt section and 24 volts at low current, because despite having replaced everything, I'm still with this section locked. how can I find out something? I'll let you know. ps this TV turned off while they were watching it, and not because of lightning or other problems. it is a recurrent fault but I have to find out the problem because, even if with 100 euro I could replace the pwb, I don't feel like putting it aside but I want to find the real problem, to then make you participate and help the other technicians without having to lose too much time behind to carry out the repair. sorry if I followed the discussion but being new, I still need to get acquainted with your group. I'm using google traslator to translate and I apologize if in some cases there will be misunderstandings. thanks

This would be great!

[marcoecca]

Re: LG 55EC930V power supply problem

hello guys to today, unfortunately I'm stuck with the repair because I have not yet found the wiring diagram of the PSU. I even sent an email to LG but without any reply from them and I don't understand why the power supply wiring diagram is not in the pdf of the service manual. I kindly ask you if anyone in the group owns it and I can also pay for the EAY 63348801 service. Thank you very much! Now I am waiting for news because I am stuck and I have no intention of spending euros on a new PSU.

[budm]

Re: LG 55EC930V power supply problem

https://assets.shopjimmy.com/media/c...801-bottom.jpg
So you do not have the 12V, correct?
Is fuse F102 for the 12V SMPS power supply good?
Are R174, C167 good?

[xmandarkx]

Re: LG 55EC930V power supply problem

hello, apologies for jumping in here but this thread has the most useful information i have found so far, i can start a new thread if needed thou.

i have the same tv but it wont come on, i have tested all the voltages and they are correct but the relay is not clicking on and i have no standby light.

i have the 3.5v on pins 3 and 5 of p2300 and when i jumper pins 1-3 and 5-2 im getting the 24v on pins 8-14 on P202

any thoughts?
thanks in advance

* the power board is EAY63348801*

[budm]

Re: LG 55EC930V power supply problem

hello, apologies for jumping in here but this thread has the most useful information i have found so far, i can start a new thread if needed thou.

i have the same tv but it wont come on, i have tested all the voltages and they are correct but the relay is not clicking on and i have no standby light.

i have the 3.5v on pins 3 and 5 of p2300 and when i jumper pins 1-3 and 5-2 im getting the 24v on pins 8-14 on P202

any thoughts?
thanks in advance

* the power board is EAY63348801*

Are you saying that the control Voltages are also correct? You need to post all the power supply Voltage readings AND the control Voltages. It sounds to me that the main board is not sending the control Voltage to turn on the rest of the power supplies.