If the resistors are cheap, maybe order 2 or 3 in case it happens again.
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Only other thing I've noticed is I've gone around the board checking the reisistors and a few of them don't seem to give any response (such as RX801S) is this normal?
Yeah I think I'll change the 3 together as they all look rather burnt
3) Do you have a manual or auto ranging multimeter?
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When it stays on "1", it means the resistor is more than 200 ohms.
For autoranging multimeters, it sets the range automatically, but you still have to read the display correctly.
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Hi,
I'm also stuck with a broken 245b, no 24V but everything else working. I've cheked the RB805/7 resistors but they are OK. I check every part and used a working board to see a difference and still have no clue what's going on. I also got a new oscillator F9222L but with the same result. Somehow the curcuit is not oscillating, therefore I don't get 24V. Any Ideas?
Cross posting in multiple threads will not help anyone. It wil confuse people because info is spread all over the place. If you want help, post and keep your info in the other 245B thread where it originated.
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Huzzah! Made good progress - replaced all 3 of those resistors and the screen now has life. Works fine except the image flickers faily regularly, so still not 100%. (I had to replace the resistors with larger ones as my choice was between a 1w which was far too small and the 2w that was bigger).
Thanks for the help guys, any idea what could be causing the flickering? The flickering is almost a very rapid dimming of the image that happens every 10seconds or so and will happen quite rapidly.
Had the monitor on for a bit longer now and the flickering seems to have decreased a lot if that helps. It now flickers once every 3-10mins so guessing it gets better as something gets warmer.
Flickering is usually caused by bad caps. Try measuring the 5V and 24V outputs again to make sure they're not fluctuating. Many members will suggest recapping the entire power supply. My suggestion, as a start, would be to replace the 4 caps (embedded in the white adhesive) located at the bottom of your inverter board.
It seems to have stopped completly now its been on for an hour - I think I'll take your advice and just change all the caps though to be honest, should only cost about £10 and hopefully would mean i dont need to tear it apart again for quite some time.
Aruba had flickering and he solved it by replacing the big cap.
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Yes the "big" 82uF, 450V cap measured 0 uF and caused the typical 380VDC bulk voltage to fluctuate and causing the flicker. It has been awhile since that
LCD monitor was fixed and when I do see the owner I ask him if it it still good
and he tells me it is still working perfect.
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
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