The thing is this, some time ago in a certain fish received a HKC C340 display, more than three hundred pieces, the reason why it is so cheap is because there is a vertical line in the middle of the right side of the display, but it does not hurt, more than three hundred and what motorcycle ~ then enter the main topic, demolition!
Before changing the lights
Close-up of the vertical line
Screen model
The LCD and backlight are separated
White is a variety of backlight films, reflectors, light guide plates, polarizers, etc.
LCD panel, is Samsung VA screen, model is LSM340YP02, backlight is HKC made by itself, belongs to the assembly screen!
The LCD panel is not as brittle as I imagined, and it feels like a combination of glass and plastic, it still feels quite strong, soft and hard, very tough!
TAB close-up, logic board with LCD glass connection of the line!
This light bar was originally straight, but because it was too long, it was bent... Can not be cut, because this kind of light bar is in series, and there is no resistance, are on the power supply board chip power supply, no parameters do not know how much voltage and how much current, in order to stabilize him to bend it, is the aluminum substrate, very good bending ... This light strip was removed from the bad monitor of AOC Q3477FQ, idle for a long time, could not help but use him, after thinking about it, finally found a place to use!
I tried the position, the position can be placed, placed on the left and right sides of the screen, just a gap to put down the new light bar!
Flash drill punch, slightly ugly!
Double-sided adhesive bonding!
This power board is the power board removed from the AOC Q3477FQ, there are three wires that need to be connected to the power board of the HKC C340, namely ON/OFF, DIM, GND, ON/OFF is the control of the power board on and off, DIM is to control the backlight brightness, GND is the cold negative electrode! In this way, the backlight and power supply switch of the two power boards can be realized!
Test it first!
Connect with the main monitor HKC C340 power strip!
HKC C340 power board output
The wiring is directly broken, because my soldering iron welding head is too large to weld small contacts~
Put on the light guide plate and try it out!
The hot melt glue for the AOC Q3477FQ's power supply board is glued to the iron case!
At this time, I found that the power board DIM dimming signal of the HKC C340 monitor and the power board of the AOC Q3477FQ did not match! Dimming logic is the opposite! The DIM voltage when the C340 backlight is close to 0V, and the backlight is close to 5V when the backlight is off, and the DIM backlight signal of the AOC Q3477FQ is, the bright screen is 5V, the screen is turned off 0V, good guys! The signals of these two power boards are one east and one west. Well, since this is the case, it can only be shorted from AOC Q3477FQ with 5V and DIM, maintain the highest brightness after booting, and can only be like this for the time being, fortunately, the 3.3V boot signal is the same, and it can be perfectly controlled on and off!
When I tested it just now, I found that these lamp beads would cause light leakage, and then covered it with black electric tape
The shell is also a bit of a hindrance, digging holes...
AOC Q3477FQ power supply board with switches!
The hole was small, and then a big hole was dug, too big, and the electric tape stuck...
Brighten effect
Installed, plugged in, booted, lit, the screen was not damaged after disassembly [lick the screen]
Then I found that the left and right sides were a bit leaky because the border was narrow...
Then I thought of a way, that is, to modify the resolution, from 3440x1440 to 3400x1440, sacrificing a vertical resolution of 40, so that you can't see the area of light leakage, as the saying goes, fish and bear paws can not have both! Pictured!
After modifying the resolution, you can't see the light leakage area on both sides at all!
Increase the light bar on and off effect
The actual effect of the mobile phone shooting effect and the human eye to see is slightly different, but the overall brightness increase is obvious, this HKC C340 display factory is 250 nits brightness, after I physically increased the light bar, the previous AOC Q3477FQ display is nominally 300 nits brightness, increase the brightness of the light bar after at least 450 nits of it, there is no metering instrument, can only be left!
Summary: Disassembly is risky, and modification needs to be cautious! The overall brightness is significantly improved, because it is lighted from the left and right sides, and the display is a curved screen, which will cause the brightness of the middle area of the display to be a little different from the brightness of the left and right sides, but the impact is not large, the overall screen brightness is still uniform, and it is also necessary to sacrifice the 40 vertical resolution on the left and right sides to block the light leakage area!
END