As I get into fixing more and more written off TVs, a mystery of design I keep wondering about is, why are some inverters for tube-lit TVs really complex, and others really basic. I've just worked on a 42 inch TV that has two inverter boards, packed with SMT components, two inverter transformers per board, and miscallenous other gear. I've worked on other TVs where the inverter circuit is on the power supply board, and has a simple oscillator, copule of driver FETS and an inverter transformer. Please explain?
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Hi everyone,
I’m currently learning about the USB protocol and designing a project, but I’ve encountered a few questions that I couldn’t find clear answers to. I’d really appreciate your input!
1. USB 3.2 Gen 2×2 with SuperSpeed Type-A Connector
According to the USB 3.2 specification, it states that USB 3.2 Gen 2×2 can support a SuperSpeed Type-A connector. This raises a question:
If we use a SuperSpeed Type-A connector, the system would only utilize 1 lane for data transfer, leaving 1 lane from the host unused. Is this configuration valid,...06-26-2025, 03:27 AM -
I just got this tv today and it appeared to have no backlight on. After taking off the rear cover and checking again in the dark I can see that MAYBE one quadrant is lit.. But still it's quite dim. I was going to check the LEDs with my tester, and I found LED 1 and LED 2 + pins on the wire from the inverter, but I couldn't identify a ground. Nonetheless I tried using a mounting screw on the inverter board and also the chassis as ground but regardless my tester reads 300 which is what it reads when there is no voltage draw.
I don't know how exactly to test the inverter itself. Is it... -
Greetings everyone,
I have a HANNSG Hi221 monitor that exhibits two seconds to black issues (backlight goes off, display is still on as confirmed by shining a flashlight on it) with some additional oddities...
The monitor failed on me with a standard "2 seconds to black" some time ago prompting me to initially replace most of the electrolytic capacitors (some of them were bulging/leaking).
Things kinda sorta worked for a night, then the problem returned along with some flickering and "buzzing" noises.
Upon closer inspection... -
I have a tripp-lite aspint 3636vr inverter charger which blow some of mosfet transistors. I replaced them repaired also the driver circuit and tested but the mosfets burn again.
It work very well as inverter and also as charger if I let the rear switch in auto mode (inverter) and charger only(charging) but in auto when I connect the feed line 220V AC first time it pass ok to line and start charging the batteries but when I remove the feed line it pass to inverter mode and if I do it again the second time when passing from charging to inverter the Main transformer start making a...03-06-2023, 07:07 AM -
Design of CCFL Backlight Inverters with Frame & Bar Cores
Summary
Portable devices, such as notebook computers and personal digital assistants are developed rapidly nowadays, which places an increasing demand on display technology. The LCD with cold cathode fluorescent back lighting satisfies the requirements on display performance, size and efficiency.
The backlight inverter plays a crucial role in supplying the power to the lamps of these flat-panel displays.
The frame and bar ferrite cores, described in this brochure, are especially designed...10-07-2024, 04:26 AM
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