Is this high-voltage transformer OK?

[costinvint]

Re: Is this high-voltage transformer OK?

In summation,

I got the new inverter (ZX421 small 4 lamp CCFL universal inverter for LCD) from ebay and now everything works fine. So, thanks to everyone who helped.

[civismo]

Re: Is this high-voltage transformer OK?

One thing that attracts my attention is the 2.2uF cap next to the FP5451A. This might be a red herring, but check the voltage across the cap, and where it connects. Ir it is in the power supply circuit and has 19V across it, don't worry. But if it's in a timing circuit, suspect it.

PlainBill

PlainBill, Thank you so much !

I just repaired an Elo Touchscreen ELO Touchsystems ET1725L 17" Touchscreen LCD ET-1725L with a sampo qpwbgl957idg-2 Inverter.

The monitor was turning on, and I could notice in some posititions with a flashlight that the image was there.

I measured the whole Sampo inverter, everything seemed allrigh, but i never got the 8V at the output of the AO4411 Mosfets .

Because of the suggestion of Plainbill e tested the 2.2uF capacitor with a capacimeter / ESR Tester , and Voila: 157 pf only !

Changed and it works like a charm !

Sometimes it´s not only the price of the spares: It´s getting things done.

I fould similar Sampo inverters on ebay in the price range +/- 35 dollars, and i could order it from china , but it´s so much better this way, not mentioning the time it would take and burocratics

Hope this will help someone with the same proble someday, somewhere

[goontron]

Re: Is this high-voltage transformer OK?

PlainBill, Thank you so much !

I just repaired an Elo Touchscreen ELO Touchsystems ET1725L 17" Touchscreen LCD ET-1725L with a sampo qpwbgl957idg-2 Inverter.

The monitor was turning on, and I could notice in some posititions with a flashlight that the image was there.

I measured the whole Sampo inverter, everything seemed allrigh, but i never got the 8V at the output of the AO4411 Mosfets .

Because of the suggestion of Plainbill e tested the 2.2uF capacitor with a capacimeter / ESR Tester , and Voila: 157 pf only !

Changed and it works like a charm !

Sometimes it´s not only the price of the spares: It´s getting things done.

I fould similar Sampo inverters on ebay in the price range +/- 35 dollars, and i could order it from china , but it´s so much better this way, not mentioning the time it would take and burocratics

Hope this will help someone with the same problem someday, somewhere


(image)

shoot i should have seen this sooner, i fixed one by replacing ALL the caps even the SMD electrolytics with polymer where i could and new 'lytics where i couldn't.