Re: Why does an LCD need a reset line?
Or maybe CPU doesn't reach stage when LCD must be on so reset line is low.
Or maybe CPU doesn't reach stage when LCD must be on so reset line is low.
-
-
Re: Why does an LCD need a reset line?
I mean power up,resume from standby etc.So if this line is shorted then it's the transistor within the CPU that's gone bad holding it at 0v correct?
Are you sure is shorted?
In many cases when you measure something like that on powered devices is possible that multimeter read in fact C-E or G-S (depending on transistor used) in ON state.
Is more convenient to keep reset low and timed enabled as needed vs let it floated or high and just a pulse when needed.That for devices in stand-by or sleep mode.
Without battery or charger connected is still short on that line?Comment
-
Re: Why does an LCD need a reset line?
Yes I measured with no power at all in diode mode, red probe on ground and black probe on the reset pin and get 0v.
A known good working board with same measurement done in diode mode reads .432v
Not sure how it shorted or whyComment
-
Re: Why does an LCD need a reset line?
Is clear now that is a short on this line.
I suppose LCD was disconnectet too.
Can't look on schematics if there are any other components,like a capacitor,from this to ground.
Just fixed few days ago on 6s draining battery and can't enable touch id.
One little capacitor get shorted.Comment
-
Hey there people
While working on my Acer Aspire with the OS failing to load, I encountered a motherboard number of DA0ZHQMB6E 0 REV: E. I was getting nowhere fast or slow, for that matter.
This is what I tried, but not in any order.
Google
YouTube
BIOS
Command Prompt (administrator privileges)
>
On Google AND YouTube, I was getting mixed messages, try this and try that, but when you cross reference the advice it is either the wrong model (even though you enter the correct search term) a YouTube case in point, with the search term "how to...10-25-2025, 02:22 AM -
Hi all.
I have a Kogan 65' LCD Panel with a thin blue vertical line (top to bottom) on left hand side of panel.
The line just happens to coincide with the end of COF and start of the next COF (attached).
The line is permanent no matter what I've tried. I've tried pressure testing the panel (top to bottom) and all over, I didn't notice any difference with the line, either temporary or semi-permanent.
Also tried unplugging all flex cables, cleaned with isopropyl then re-inserting to no avail - line remains.
Hoping to fix... -
I am a hobbyist (not a professional) so please be gentle...
I recently received an XR-77A80J that wouldn't turn on. (Repeating 5 flashes when plugged in.)
I did a hard reset by holding the power button for about 30 seconds until the set powered down. I then tried to turn it on and it powered up, bringing me to the setup screen. There's not a lot of detail on the setup screen but the picture didn't have any distortions, so at least a cursory examination suggests no physical damage to the screen. The set appeared to be working normally, but it shut down after about 15 seconds,... -
I'm troubleshooting a Philips MDP 3380/12 Blu-ray player that shows no signs of life. The display remains off, and no buttons respond.
Inside, the power supply is working correctly, and all expected voltages on the mainboard match the service manual specifications. The CPU warms up slightly (checked with a thermal camera), the crystal oscillator is functioning, but the reset signal remains high at all times.
The reset circuit appears to consist of two NPN transistors, one driven by 5V VCC and the other by 3.3V STBY, as shown in the attached schematic. Should the reset... -
Howdy everyone! I hope all is well where ever you are!
I'm attempting to integrate a couple of LED pods into an automotive reverse lamp circuit. The problem being, while the vehicle is running there is a 8.5v current present on the reverse lamp power wire. Needless to say is that all LED pods and lights dimly illuminate while the 8.5v is present, so the LEDs are always powered on while the vehicle is running. When the vehicle is shifted into reverse, the voltage changes to 12 volts.
I am uncertain how to convert this line into a switched 12v output line for the LED pods....
Comment