Re: Panasonic Viera mod: TC-L39EM5X
Hello nomoresonys,
my client bought this TV like this.
This TV had already been repaired previously since the two flexes that go from the T-Con to the panel are different from each other.
Even one of its speakers is not the original. It's different too.
The button sequence (menu +1147 or menu +2383) doesn't work....
Quantum IC
Member
Last Activity: 07-28-2023, 03:39 PM
Joined: 09-19-2021
Location: New York
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Last edited by Quantum IC; 07-25-2023, 08:55 PM. -
Re: Panasonic Viera mod: TC-L39EM5X
I try to enter service mode with this sequence:
While pressing the [VOLUME (-)] button on the main unit, press the [INFO] button on the remote control three times within 2 seconds.
But I don't know how to navigate in this menu.
The folowing optios are displayed:
(See attached picture )
If you know how to navigate this menu and where I can perform a factory reset, I would appreciate your help....Leave a comment:
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Re: Panasonic Viera mod: TC-L39EM5X
I already reset all the settings in the user menu with no results. The image remains the same....Leave a comment:
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Panasonic Viera mod: TC-L39EM5X
Hello guys,
I have this TV that has a large or stretched image as you can see in the following video.
Is the first time I see this problem.
At first I thought there was a configuration problem in the user menu, but it's not.
I need your sage advice to fix this problem.
I have my doubts about the main board firmware or bad panel.
But I want to know what repair tips you guys give me.
Best regards....Last edited by Quantum IC; 07-24-2023, 09:41 PM. -
Harman/Kardon Onyx II Bluetooth Speaker
I have this speaker that won't turn on.
The BC57E687C Bluetooth chip gets warm after about 1 minute with the wall charger connected.
I hope you can help me please.
I attached a very similar schematic.
Mi altavoz tiene micrófono incorporado y entrada auxiliar. El diagrama del altavoz en el esquema no.... -
Re: Harman/Kardon Onyx Bluetooth Speaker - No Power
Hello everyone
I have the same Onyx Studio that does not turn on.
The BC57E687C Bluetooth chip gets warm after 1 minute with the AC adapter connected.
I hope youcan help me please.Leave a comment:
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LEDs for TV Backligth
Hello everyone
I'm new to LED strip LED replacement.
The original LED comes with a single internal LED or chip. I only get at the moment LEDs with two internal LEDs or chips.
I understand that this is due to the tone of the light they emit.
My Doubt is:
Can I use the LED with two internal chips without problem?
Will there be much difference in the picture?
I'm going to replace all the LEDs.
Both LEDs (original and replacement) are 3V and the same size....Last edited by Quantum IC; 03-04-2022, 04:10 PM. -
Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
I replaced the thermistor with a 2.2Ω 7W ceramic resistor because I couldn't find a similar thermistor and just as a test to rule out if the thermistor was faulty.
This resistor also gets very hot in about 1 minute.
I can't figure out why, if when I take the amp reading through the thermistor or through the resistor, I don't get a high draw.Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
How can I log in SM and clear the register?
I don't have the remote and the owner of the TV lost it....Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
When I press the power button for the first time after plugging in the TV, the voltages are present for about 1-2 seconds and then drop to 0V, except for the STBY 3.3V and AC OFF DET 3V voltages, which are always present.
Then when I press the power button again the TV turns on and all the voltages are present.Last edited by Quantum IC; 01-26-2022, 04:07 PM.Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
Do you mean the first time I press the power button?...Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
I think you're wrong. Of course, 250W is too much, it's even above the consumption marked on the label of this television.
But I got 600~700mA (0.6~0.7A) and if I'm not mistaken that means around 66~77W.
Mi line voltage is 110V.
The label on this TV says a power consumption of 158 W.
It's an LCD TV. Its backlight is by CCFL lamps....Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
I made a mistake measuring the PFC voltage, sorry. I was taking measurements of the heat sink which is not a good ground.
I have 388.5V on the main filter when the TV is on and 158 when the TV is off.
Attached images of the voltages obtained in the connectors....Last edited by Quantum IC; 01-24-2022, 07:59 PM.Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
When I activate the SMPS manually by making a jumper between the STBY and POWER ON pins, I get 389V in the main filter, but when the SMPS is mounted on the TV and with everything connected, I get 375V in the main filter.Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
I thought the same but
If the SMPS draws too much current, why when I measure the DC current in series with the thermistor I get 600~700mA?...Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
I disconnected the inverter board and only leave connected the main board to power supply and doesn't overheat. Of course, I have 6 blinks meaning backlight because the inverter board is disconnected.
This TV is drivin' me crazy...Last edited by Quantum IC; 01-16-2022, 11:41 PM.Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
I checked the gate resistors and diodes again and the diodes are OK, the resistors are within their value with their respective tolerance.
I couldn't find any similar thermistor to prove whit a new one. I removed the thermistor from the power supply, heated it with my hot air gun and its resistance goes down to 0 Ohm and as it cools its resistance goes up. I did this three times and I hade the same results.
I turned on the tv and measured the current with...Last edited by Quantum IC; 01-16-2022, 08:48 PM.Leave a comment:
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Re: Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
I couldn't find any similar thermistor to prove whit a new one. I removed the thermistor from the power supply, heated it with my hot air gun and its resistance goes down to 0 Ohm and as it cools its resistance goes up. I did this three times and I hade the same results.
I turned on the tv and measured the current with my multimeter in series with the thermistor and got 600, 680, 700mA.
I expected to get a higher consumption.
I hope the pic are goods and you can...Last edited by Quantum IC; 01-16-2022, 08:47 PM.Leave a comment:
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Sony KDL-40BX450 LCD. Thermistor gets too hot 10 seconds after turning on the TV
Hello every one,
This TV came to me with the problem that it was totally dead.
The problem was the two MOSFETs and a fuse resistor in the power supply.
The original MOSFETs were KF7N50F and I repalced them with SLF65R700S2.
The original fuse resistor was 0.1 Ohm 1/2W. I didn't find a similar fuse resistor and I replaced it with 0.1 Ohm 5W ceramic resistor.
When I plug the TV the ST-BY LED turns on, when I press the power button on the TV, the ST-BY LED turns off and the TV doesn't turn on until the second time I press the power button is when the TV turns on,...Last edited by Quantum IC; 01-14-2022, 12:27 AM. -
Re: New Members - please post your introductions here
Hi, my name is Frank. I´m from Mexico.
I learned some electronics from my dad 22 years ago. Back then I was a kid and didn't take electronics very seriously. The technology we fixed was THT (Through Hole Technology), linear power supplies, CRT televisions and the like.
I've always been interested in how hardware and software work. I spent about 2 years helping my dad, then I went to high school and got away from electronics.
Two years ago I started learning the "new electronics" (you know SMT,...Leave a comment:
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