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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It’s not something that can be detected at the driver level You must log in or sign up to reply here. I have also noticed basic electronics design deficiencies with 2 of my 6 LCD monitors. DigeratiMar 12, I am not happy that a 50 cent component was omitted.

【TL1451/TL1451ACN TI】Electronic Components In Stock Suppliers in 2018【Price】【Datasheet PDF】USA

This component was essentially missing, which may have led to the inverter board going into short-circuit protection mode unnecessisarily after external component parameters tl451 drifted over time. WojskiMar 13, WojskiMar 12, The reset circuit is connected to a 5V supplybut drives 3V logic.

You might want to check that chip for 5V tolerance. I would also never leave the repaired monitor on while unattended just in case of a failure. Log in or Sign up. Yes, my password is: The longest chip on that board is the TL, it is almost right in the middle of the board. I referred to this tp1451 a design deficiciency because there is not even a tl14551 on the PCB for a potentiometer, so the board design does not consider the backlight current draw increasing after years of operation.


TL Datasheet(PDF) – Texas Instruments

I would not tl14551 go with 39k – I would fit the highest resistor value that allows the inverter to run minimizing the OCP level change. 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.

There is quiet a few surface mount caps and resistors around it. WojskiApr 4, The board it resides on is the long circuit board attached with two screws on the side gl1451 the panel shield. The lack of a 50k pot does not in any way mean that tl141 OCP threshold has not been carefully considered. Since I do not have 50 messages, yet I have to start a new thread. Design deficiency is very likely the cause here.

Unisonic Technologies – datasheet pdf

I have never seen accountants get involved at the board design level, i could see them possibly sticking their noses into and scrutinizing the bill of materials out of boredom, but something such fl1451 a missing component placeholder would more likely be the decision or oversight of the board designer. That is why I would like to see the schematic. As for the monitor: Seems to be a design deficiency.


As the backlight lamps age, they require more current from the inverter to fire and to stay illuminated. The notorious problem there is the under-voltage reset circuit. I populated a 39K resistor at site C10, [in shunt with C12 which is 10uF] and monitor works.

Type the part number and search for literature Littlest HoboApr 3, tl451 Apart from the backlight it should almost be everlasting. WojskiMar 11, I have been using this monitor since adding the original post and it still works fine with the 39K resistor.

There is some info about this chip on the ti website www.

Not a visible problem on most monitors but 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. No, create an account now.

Lcd Troubleshooting – 2

A previous employer of mine had a product to fire and light a large lamp, and the unit had an OCP trimpot to set the current limit higher within certain limits to allow older lamps to be used.

The prescription was given by “Littlest Hobo”.

What must be made clear is that there is risk in arbitrarily adjusting the OCP limit higher which adding the 39k resistor does.