LG55UH615T pulsating Redstanby LED
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Re: LG55UH615T pulsating Redstanby LED
Nothing can get worse, any suggestion to nail the problem are welcome....Only last resort yo get another PS board.Comment
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Re: LG55UH615T pulsating Redstanby LED
You have nailed the problem.
Ironically, I repaired the original board instead of the one I purchased. I use the purchased (faulty board) and did some comparison.
So the problem of my original board is as follows:
1. IC 801 faulty ...... internal circuit issue and it also affects the reading of R806 (10K)
2. R822 4R7 value increased
3. While trying to unsolder the MOSFET Q802 5N40, one of the lead drop off , so I cant say if this MOSFET is good or bad....Anyway I don't have this part but replace it with 9N40 which is better spec then the one used.
Replace IC, 2 resistor , 1 MOSFET .... Power Up standalone and no smoke before connecting back to the TV..
All back to normal!!!!
Anyway I didn't bother to repair the CN board.... probably is the same problem as you mentioned.... IC801
Closing this thread.... For those who have same problem, can use this as a troubleshooting reference.
Thanks All who have chipped in for this troubleshooting.Comment
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Re: LG55UH615T pulsating Redstanby LED
Thanks Davi.p
You have nailed the problem.
Ironically, I repaired the original board instead of the one I purchased. I use the purchased (faulty board) and did some comparison.
So the problem of my original board is as follows:
1. IC 801 faulty ...... internal circuit issue and it also affects the reading of R806 (10K)
2. R822 4R7 value increased
3. While trying to unsolder the MOSFET Q802 5N40, one of the lead drop off , so I cant say if this MOSFET is good or bad....Anyway I don't have this part but replace it with 9N40 which is better spec then the one used.
Replace IC, 2 resistor , 1 MOSFET .... Power Up standalone and no smoke before connecting back to the TV..
All back to normal!!!!
Anyway I didn't bother to repair the CN board.... probably is the same problem as you mentioned.... IC801
Closing this thread.... For those who have same problem, can use this as a troubleshooting reference.
Thanks All who have chipped in for this troubleshooting.
Plese do you confirme that the resistor next to the 4r7 the 010 is 1 ohm resistor I get 100k value. ????Comment
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Re: LG55UH615T pulsating Redstanby LED
These TVs have a lot of bad backlight issues. Sad part is only 1 led has to go bad for the whole tv to shut down.
Replacing backlights and turning the backlight setting down usually solves the issue. You can also modify the board to lower the amps to the backlights.
There is a thread that describes the processComment
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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.... -
by KYBOSHI picked this one up today.
Previous owner says no signs of life.
TV looks immaculate and its a 2022 model year so I thought maybe the one connect cable was damaged.
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The TV model is QN65LS03BAFXZA - version: CB06
The One Connect Box BN44-01066D / BN96-54788Q / BN39-02470A.
I immediately remembered EazyBone's Samsung The Frame TV no power....One Connect thread and am preparing myself to tear the One Connect open and hunt for dead parts.
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by fharris1977Hi. I got a Vizio with no power or standby, and won't turn on with remote or button. I checked the voltages on the connector and all read 0.00V or nearly 0(0.050 ON/OFF pin). None of the pins are labeled STB for standby although I do see some 5V pins. Other than the obvious standby led, which isn't coming on, is there a way to check for standby voltage on this PS. I'm trying to see if my problem is the PS or mainboard. Some Vizios I have fixed with no standby led me to think it was the PS but it turned out being the mainboard. Any experience with this set would be greatly appreciated.1 Photo
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by An-klammHello!
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It is a Samsung UE 55HU8590 with one connect box.
When I turn on the TV without the one connect box, the animation on the TV tells me to connect the ocb.
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