Re: LG 50pq3000
If you have schematics from this PSU please upload it.
bill25
Member
Last Activity: 02-17-2025, 03:58 AM
Joined: 09-28-2015
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Re: LG 50pq3000
No its not bad l have a new one and checked.
Pin 5 - 0 volts
Pin 12 - 0 volts.Leave a comment:
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Re: LG 50pq3000
The relay click once every time, i start the TV.Leave a comment:
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Re: LG 50pq3000
The relay click once on start up. Resistors are good i check them first. I replace the IC801 already. (L6599D).Leave a comment:
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Re: LG 50pq3000
It's difficult to see if it works properly but i wonder, can i change it with a new one? or is programmable from the factory (LG).Leave a comment:
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Re: LG 50pq3000
The voltage on pin 5 on the IC is 4.8vLeave a comment:
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Re: LG 50pq3000
The relay clicking all the time (every time i put the TV on) and voltages is 380v without the resistor.Leave a comment:
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Re: LG 50pq3000
I think is 5.1 volt after a fast search for voltages on the IC but i will check tomorrow for sure.Leave a comment:
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Re: LG 50pq3000
Its the mc80f0708-09fd.Leave a comment:
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Re: LG 50pq3000
[attach]232725[/attach]...Leave a comment:
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Re: LG 50pq3000
The results from the bypass with resistors is the same. No dc power on the mainboard and VA, VS connectors. I believe that the big IC with 28 pins is not working properlyLeave a comment:
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Re: LG 50pq3000
The mainboard is changed with another one with no effect. I try tomorow to start the psu with the resistors and see what happens. Thanks for your advices.Leave a comment:
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Re: LG 50pq3000
Biruslapio please check symptom on my first post. 5 volt is on, relay clicking, Red light desapear, no sound no image, and after a minute Red light is back again.Without mainboard relays not clicking.
RJ all fuses are OK.Leave a comment:
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Re: LG 50pq3000
Ac voltages 220v , bridge +300v DC on the first part of psu its ok. Second Part cables to motherboard only 5 volt stby is stable and cables VS, VA to YSUS have no volts. I believe PSU without the mainboard is not start to fix all the other voltages. I understand from the begining that the problem is the PSU and check almost all important parts on it, with no luck. So is someone who have the same problem with me or any idea how to fix it?
Thanks.Leave a comment:
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Re: LG 50pq3000
I tested the psu with the motherboard only and the problem its the same no voltages.I changed the motherboard with another and nothing happens I suspect the psu because of the AC power outage for a few second. I am electronic tech. here in my country but my knowledge its not good with plasma tv's. I understand the logic of all the bords but i dont have the experience, because i fixed plasma's only 2 or 3 times. Thanks.Leave a comment:
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Re: LG 50pq3000
I checked all the posts already. Nothing helpfulLeave a comment:
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LG 50pq3000
After a power outage, my lg plasma tv fails to start. When i try to start up the TV, clicking sound comes from psu and the Red light desapears. After a minute the red light is back on. No sound no image nothing.I checked all voltages on the secondary of power suplly and only 5 volts stby is correct. I checked some parts like power mosfets, diodes, zeners. fuses, resistor, etc.On the first side of psu 300v on big caps is on. If you can help i would appreciated. Thanks! -
Re: Dac-12m019 aor
I replace with 1n4148 diode and nothing happens. No volts no stby. Also i replace the TEA1523A. The voltage across the main filter cap 450v is correctLeave a comment:
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Re: Dac-12m019 aor
Thanks you very much for the info. I'll try it tomorrow and come back to tell you what happened.Leave a comment:
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Re: Dac-12m019 aor
Someone can help please?Leave a comment:
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