Re: Inverter Transformer??

Someone on eBay has a few of them. Might we worth a shot.
A search for the part number should turn it up.

Re: Testing the c5707 transistors

Not sure if it fits your scenario or not but these were used in the PSU/Inverter boards of several BenQ/Dell/HP monitors where they were usually shorted due to bad solder joints on the transformers and ballast caps.
I'd probably move on to checking other components if I couldn't find a short between the transistor's pins. (A beep in continuity check or less than 2 ohm resistance in 200ohm range if your DMM doesn't have continuity check)
There shouldn't be a short between any 2 pins of the transistor. (only exception being between the...

Re: Inverter shuts down instantly

Thanks for the reply though.

Ended up being a bad controller chip. Replacement fixed it

Re: Inverter shuts down instantly

Just checked both. They measure fine out of circuit

I can also change the channel that triggers the shutdown by changing the position of the diode in the D9-D12 row that selects between the channels for what I assume is some sort of feedback. (No idea why they only take it from a single channel though.)

Hey guys

I'm kind of at my wits end with this repair. I'm wondering if anyone could maybe offer some advice.

Subject: DARFON 4H.V1561.091 4-channel backlight inverter

Symptoms:
Instant shutdown with any tube connected to CH4 (barely noticeable blink)
With no tube on CH4 runs all other channels for 2 seconds then shuts down
Does the same with known-good tubes.
Known-good inverter does not shut down with the tubes that go with this board.

Fuse is intact.
Transformer primary and secondary resistances...

Re: New Members - please post your introductions here

Hey everyone
Just a hobbyist who likes fixing things here.