Re: LG 50PX4R-ZB stuck in standby mode
On the power supply.
On the power supply.
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Re: LG 50PX4R-ZB stuck in standby mode
I measured 19v and GND and it only measures 0.008 mV DC Should i measure in DC or AC ?
thanksComment
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Re: LG 50PX4R-ZB stuck in standby mode
DC. Do you see any other voltages that are measuring low?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: LG 50PX4R-ZB stuck in standby mode
When you press the power button, or turn the TV on using the remote, do RL ON, VS ON or anything else change?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: LG 50PX4R-ZB stuck in standby mode
Did you note that with your old board? Because that indicates power supply not working? Did I miss something?
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Re: LG 50PX4R-ZB stuck in standby mode
I am not sure if your power supply or main board is bad now. RL ON should cause the output voltages to come up, but you are not seeing them rise? On the other hand, the power supply might be waiting for VS ON before turning on the outputs fully.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: LG 50PX4R-ZB stuck in standby mode
OK So the output voltages i presume go from the power supply to the main board then back to the power supply on the 19v gnd pins connector ??
But there is a possibility like you said that the power supply board is waiting for a voltage at vs ON before turning the output voltages to the main board ??
The main board does have a red led light on it ???Comment
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Re: LG 50PX4R-ZB stuck in standby mode
Do you think it will be a power supply replacement or do you think it may be repairable ?? I cant see any indication of badcaps though??Comment
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Re: LG 50PX4R-ZB stuck in standby mode
The power supply produces the voltages, which come up at those outputs.
Do you hear a relay click when you press the power button?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: LG 50PX4R-ZB stuck in standby mode
do you think that this indicates a faulty power supply thanksComment
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Re: LG 50PX4R-ZB stuck in standby mode
I am not certain, but I would try that next. Unfortunately it is difficult to be certain.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: LG 50PX4R-ZB stuck in standby mode
OK thanks for your help tom .... do you think it could be a capacitor problem ... ive heard that sometimes a bad cap might still visibly look ok ?? ive bought a new impedence meter but only goes to 2000uFComment
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Re: LG 50PX4R-ZB stuck in standby mode
I would not expect so. With bad caps you'll typically get an output voltage but it will be lower or higher than it should be.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: LG 50PX4R-ZB stuck in standby mode
OK so i need to replace the power supply board ?
I will have to try and find one !!
Thanks againComment
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Re: LG 50PX4R-ZB stuck in standby mode
Can you return your main board?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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Re: LG 50PX4R-ZB stuck in standby mode
Tom, this set appears to use the same ysus,zsus as the 50PX5D. I'd have a closer look for shorts, blown fuses or symptoms on those boards and IPMs.
The initial post symptoms sounds like it could be protection mode. I don't remember all the ins and outs of the couple I had but sounds similar and I know on those you'd get a click , LED would change then back to standby in about 10secs.
IPMs replaced on both Y & Z got that junker going again and a bad Ysus was burning up resistors on the Z.
Horrible TVs to work on, the LG Fallas TV trainig guide would be close to this, but the translation to english makes the flow charts near impossible to understand.
There's a note , Unable to check voltage when disconnecting Ysus due to 50" protection?Attached FilesLast edited by tw2005; 08-09-2013, 05:48 PM.Comment
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Problem
This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached.... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi All.
I have an 820-02016 board (A2337 M1) that has come in for data recovery. Reported as liquid damage, but no visible evidence of any liquid damage.
Board was initially stuck at 5v, and current only spiking occasionally to around 400mA and cycling.
After initial troubleshooting, found that C7800 (which feeds the power rail PP5V_BSTLQ_VOUT_SPMU) was dead short to ground.
Replaced C7800 and short gone. Board still stuck at 5v. Current draw behaviour changed. It now spikes up for a second to around 100mA to 130mA, then drops down to... -
Hi everyone,
I'm trying to troubleshoot and repair this old LG OLED curved TV, model 55EG910V.
I did some basic troubleshooting and reviewed most related posts here, but I wasn't able to isolate the issue.
The TV shut itself off during playback and never came back to life - the standby light remains off. My dad claims that it has happened a few times in the past but the issue resolved itself after some time. Not this one.
After checking the basics I did the following:- I measured all voltages and as expected the only active supply is the 3.5V standby. It
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This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today....
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