Re: Sharp LC60C6400U - 2 long binks, 5 short blinks error code
Many LED LCD TVs are left to run at their default backlight setting of 100%.
This must be shortening LED lifespan.
rievax_60
Badcaps Veteran
Last Activity: 09-26-2022, 06:47 AM
Joined: 05-24-2012
Location: mackay
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Re: Toshiba A200 random shutdown
The NEC Tokin capacitors have been replaced in all of my A200 laptops years ago. I mainly use ceramic caps.
I'm totally certain that the temperature sensor ICs were the cause of this recent shut off symptom, not restarting....Last edited by rievax_60; 04-24-2021, 04:45 AM.Leave a comment:
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Re: Toshiba A200 random shutdown
After all of these years, I'm still using some of my Satellite A200 laptops.
Mainly the models that use the Intel 965 chipset.
I have just repaired the 2nd one that was randomly shutting off.
I fixed both by replacing a temperature sensing IC near the CPU.
The IC is marked "G784".Leave a comment:
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Re: Sharp aquos LC-40LE810E
PNL-12V should be pin 1 of PL connector.Leave a comment:
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Re: Sharp aquos LC-40LE810E
Pins 1 and 2 of PC7703 are on the live side. Leave them alone for now.
The schematic for the power supply can be found here,
If AC-DET is high while ever PS-ON is high, it means that the AC-DET is working properly.Last edited by rievax_60; 07-12-2018, 06:17 AM.Leave a comment:
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Re: Sharp aquos LC-40LE810E
Those voltage readings show that the AC-DET is working properly.
There must be something else wrong, Does the voltage on pin 1 disappear after 7 seconds also?Last edited by rievax_60; 07-11-2018, 09:25 AM.Leave a comment:
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Re: Sharp aquos LC-40LE810E
Measure some pin voltages on the PD connector as the TV is being turned on.
Look at post 21 as an example.
I mainly want to know what happens at pins 1 and 9.Leave a comment:
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Re: Sharp aquos LC-40LE810E
Yes, solder a 68K on top of R7019 or replace R7019 with a 33K or something a bit lower. The value is not critical. This mod increases LED current to compensate for the loss of the opto's CTR due to aging.
I don't recommend jumpering pins 9 and 11.Leave a comment:
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Re: Toshiba Picture Fades To Black But Audio Continues
I have a Regza 42x3000a here which fades to black from bottom to top only when it displays video.
If I unplug the antenna or switch to an AV input in with nothing connected, the screen stays active indefinitely.
Does anyone have an idea on this?Leave a comment:
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Re: Toshiba L650 power problem
I'm working on an L650 with a suspect faulty MAX17435. It was totally lifeless.
The voltage on the ACIN pin is correct but ACOK stays high. The cause of this should only be because of a problem in the MAX17435.
After connecting the ACOK pin to ground and bridging the power source MOSFET, the laptop works normally on adapter power with one exception. Before pressing the power button, the adapter has to be initially disconnected then connected.
If the laptop is shutdown and then turned on again without interrupting adapter power, the...Last edited by rievax_60; 05-09-2018, 04:59 PM.Leave a comment:
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Re: Yamaha RXV595 turns off instantly
It does say "DC 18%", I'm hoping that this might mean DC protect.
I have seen false DC protect shutdowns caused by leaky diodes causing unindented interaction between Mute, I protect and DC protect circuitry.Last edited by rievax_60; 01-28-2018, 08:01 PM.Leave a comment:
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Re: Yamaha RXV595 turns off instantly
Also measure the voltage at the Base of one of the mute transistors to see if it ever attempts to go negative just before shutdown. It should go to -15v in a properly working receiver.Leave a comment:
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Re: Yamaha RXV595 turns off instantly
Shutdown after 3 sec is likely to be excessive amplifier DC offset. Sometimes it can be a fault in the protection circuitry.
Measure the DC offsets.Last edited by rievax_60; 01-28-2018, 07:14 PM.Leave a comment:
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Re: TL431 question
Also, the TL431 will draw an increasing current of up to about 500ua well before the Ref pin reaches 2.5v. The TL431 needs to be allowed to draw a minimum of 1ma before any driven circuitry responses.
For example, if the TL431 is driving the LED in an opto coupler, a resistor of about 1K needs to be placed across the LED to achieve proper regulation.Leave a comment:
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Re: How to read and understand schematic diagram.
It is not really possible to directly learn to read electronic schematics. It is necessary to first understand basic electronics, then progressing to understanding how various electronics components function and interact.
And also to understand how logic functions are electronically represented. Maybe you do already?Leave a comment:
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Re: Is the 50% loss of energy when charging a cap from a battery a set rule in stone?
I don't think inductors are weird. They just do everything in an opposite way to capacitors.
Capacitors store energy electrostatically and cause current flow while attempting to oppose voltage change.
Inductors store energy magnetically and produce voltage while attempting to oppose current change.
These opposite characteristics are what cause LC resonance to exist.Leave a comment:
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Re: Is the 50% loss of energy when charging a cap from a battery a set rule in stone?
It is ok to have no resistance, superconductors do exist. Inductance can never be eliminated and can't always be ignored.Last edited by rievax_60; 11-20-2017, 11:20 PM.Leave a comment:
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Re: Is the 50% loss of energy when charging a cap from a battery a set rule in stone?
"In other words, what voltage should the capacitor be when it has 14.4mJ of energy in it, which should be double or twice the amount of the 50%, if I am getting that correct at all."
The 100uf capacitor would have to be charged to 16.97v for 14.4mj of stored energy.
V=√(E/0.5*C)Last edited by rievax_60; 11-20-2017, 06:35 PM.Leave a comment:
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Re: Is the 50% loss of energy when charging a cap from a battery a set rule in stone?
The charging of the capacitor could be made more efficient by purposely placing a large inductance in series. I would expect the capacitor to be charged to close to double the supply voltage at which point the switch has to be turned off before the capacitor begins to discharge.Leave a comment:
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Re: Is the 50% loss of energy when charging a cap from a battery a set rule in stone?
There will be no zero resistance paradox because of the unavoidable circuit inductance. The circuit will oscillate indefinitely if every part has no resistance and no other losses.Last edited by rievax_60; 11-20-2017, 04:07 PM.Leave a comment:
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