Is it normal that a voltage of 54 volts is still applied to the LED strips when the TV is in standby? There is not much current, but I can see several of the LEDs are on but very very dim. When the TV is turned on, the voltage jumps up to about 100v (there are 33x3v LEDs, I removed 3 bad ones)
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Re: Voltage still applied to LED backlight stips when TV in standby?
however you didn't wrote the TV type and model No. but i assume its first generation of LED Android TV. -
Re: Voltage still applied to LED backlight stips when TV in standby?
Its an RCA RLDED 4331B: 43 inch LED TV (From 2015 I think). Not a smart TVComment
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Re: Voltage still applied to LED backlight stips when TV in standby?
i see. its all in one boards. i think its just disorder at system power off / on. reset / hard reset could bring it back to normal / real power off.Comment
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Re: Voltage still applied to LED backlight stips when TV in standby?
Tried that and same issue, but one point I didn't mention is that I don't have the panel connected yet. I removed 3 LEDs from 2 of the strips (shorted them), so I have 33 LED lights instead of 36. The main board is just connected to power and the LED strips. The connection to the panel board (inverter board?) I haven't connected yet.
I was just testing to make sure that the LED backlights work. They light up when I turn the TV on after 2-3 seconds, but when I turn the TV off, I see that some LEDs are very dim and there is still voltage being applied.
Do I need to connect the panel for the voltage to go away when the TV is off?Comment
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Re: Voltage still applied to LED backlight stips when TV in standby?
its not good idea to jumper 3 Leds... it mean in total >=9V. and did the LED build in zener diode or with out..
so in short words now the system in DIY way... disorder of power OFF / ON accurate
about the screen.. did the T-CON integrated at Panel buffer boards in case yes... the point above will be in place.Comment
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Re: Voltage still applied to LED backlight stips when TV in standby?
Ok got it and thank you! I ordered new strips and was trying to make sure nothing else was wrong before they arrived. For the LEDs I removed, I just shorted positive and negative pads where the LED was with some solder. This shouldn't affect any zener diode protection in the strip?Comment
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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.... -
I have no standby indicator light and no light on the optical port. I checked the standby voltage on the two mosfets in the top left and they both read 30mV. I checked the fuse and it has continuity. I also checked the voltage on the two large 450v caps they both read 153v. All of these voltages are the same with and without the main board connected as well as with backlights connected/disconnected.
Nothing looks obvious like a burned ceramic disc cap or bulged electrolytic. No burned resistors, diodes, or anything like that.... -
Hello,
I have a problem with this TV, the standby voltage is not present. I have checked the components around the IC fsq510's area and they seem to work, also replaced this IC but the problem persists.
These are the voltages in some pins of IC fsq510:
Vcc=18v
D=320v
Vstr=154v
Unfortunately, I couldn't find the schematic
What else could I check?
Is it possible to provide standby voltage from an external source to allow the TV to turn on?
Thank you​... -
An Asus GL503GE laptop arrived that had had a screw dropped on the motherboard while the battery was connected. This resulted in a physical damage to the 3.3v / 5v voltage controller RT6575DGQW (pu28 on schematic, page 40). Additionally, the trace to pin 12 (VIN 19v supply) was burnt.
Replaced the RT6575DGQW with a new one, repaired the damaged trace. Only getting 0.7V instead of the expected 3.3v standby voltage (3V_S5 on schematic).
Replaced the AON7408 PQ60 mosfet from a donor board as resistance was low on the gate (I did not write this value down, as I optimistically... -
Hello,
I am trying to re-purpose this power supply that I saved years ago from a tv with a cracked screen for a monitor but that is not really that relevent at the moment. I do not recall which tv but a google search looks like it is from Wharfedale LTF37K1.
You may notice I made some alterations moving some components to the top and some wires which are from a 5v regulator I fitted to the 12v output as the monitor requires 5v. The standby was already at fault from the beginning, it has nothing to do with the alterations...
Years ago it had some bulging caps...
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