The UTC TL incorporates on a single monolithic chip all the functions required in the construction of two pulse-width-modulation (PWM) control circuits. Description. The TL is a dual PWM control circuit designed for power supply control. This PWM controller includes V regulator block, two error amplifier. DESCRIPTION. The UTC TL incorporates on a single monolithic chip all the functions required in the construction of two pulse- width-modulation (PWM).
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Your name or email address: I would consider this fix a temporary measure, to give you something to use until you tl151 a new screen – it’s not a safe permanent fix in my estimation.
Disconnect and remove the inverter the board described abovetake the plastic insulator off. Does this constitute a “mistake” on the designer’s part? Apart from the backlight it should almost be everlasting. You might want to check that chip for 5V tolerance. Not a visible problem on most monitors but As the backlight lamps age, they require more current from the inverter to fire and to stay illuminated. I referred to this as a design deficiciency because there is not even a placeholder on the PCB for a potentiometer, so the board design does not consider the backlight current draw increasing after years of operation.
TL , Tube TL; Röhre TL ID, IC – Integrated
You must log in or sign up to reply here. WojskiMar 13, There is a point at which one must speak out and assign blame. This board is called the inverter – it drives the fluorescent tube.
I have isolated the cause of this issue on my NEC V to what may be a design deficiency. So what is causing the short circuit condition? Anyone else would have added this into a landfill by now. DigeratiRl1451 12, This is not about assigning blame to engineers, its about products lacking provisions for repair and maintenance. The board has a plastic insulator wrap around it, glued in two spots on the bottom.
There is quiet a few surface mount caps and resistors around it. It’s not something that can be detected at the driver level WojskiMar 11, The reset circuit is connected to a 5V supplybut drives 3V logic.
Design deficiency is very likely the cause here. A google search will still return fl1451 in the “cached” link. Type the part number and search for literature I would not arbitrarily go with 39k – I would fit the highest resistor value that allows the inverter to run minimizing the OCP level change. The board it resides on is the long circuit board attached with two screws on t1l451 side of the panel shield.
Tl – TL Integrated Circuit | eBay
The longest chip on that board is the TL, it is almost right in the middle of the board. There is some info about this chip on the ti website www. Littlest HoboApr 3, DigeratiAug 25, TL is a 16 pin, surface mount, Texas instruments device. The NEC MultiSync V 17″ had a malfunctioning fluorescent backlight inverter board; indicated by the screen going blank after seconds after startup.
I tll1451 not happy that a 50 cent component was omitted. I would also never leave the repaired monitor on while unattended just in case of a failure.
The prescription t,1451 given by “Littlest Hobo”. Digerati, I really wish to be on your side here but in light of the facts I will take Littlest Hobo’s side. I personally feel its improper for companies to experiment with OPM, while meticulously counting their own beans and quite frankly I’m fed up with it.
WojskiApr 4, As for the monitor: It is active high and drives the micro. There also seems to be no way to contact the admin about this. Here is part of his post: Potentiometers can also introduce drift and intermittency, so you wouldn’t populate for mass production unless its really needed, but this design does not even provide a proper voltage divider ie.
What must be made clear is that there is risk in arbitrarily adjusting the OCP limit higher which adding the 39k resistor does. This component was essentially missing, which may have led to the inverter board going into short-circuit protection mode unnecessisarily after external component parameters have drifted over time.
When I mention backlight current draw increasing, I don’t tl14451 if it is caused by the tube or the transformers on the inverter board MadmangurumanAug 24, DigeratiApr 3, I have also noticed to1451 electronics design deficiencies with 2 of my 6 LCD monitors. Since I do not have 50 messages, yet I have to start a new thread. This tl451 a simple consequence of the physics of the lamp itself.
Log in or Sign up. Seems to be a design deficiency.