Re: Benq FP19G+ screen will not stay on

Success!


When I initially replaced the electrolytic capacitors, and the single cooked ceramic one, I made a schoolboy error!

The ceramic cap I put in was 15nF, not 15pF !! I have now replaced with the correct one, and the screen is fully operational!

Very big thanks for helping me with the diagnosis!

Mem

Re: Benq FP19G+ screen will not stay on

I set it up as stated above.

When connecting the top CCLF's to the bottom connectors, there is nothing on screen at all.

When connecting the bottom CCLF's to the top connectors, I see the screen for a second, before blanking.

I conclude from this that all four CCLF's are working, but something in the bottom inverter circuit is not.

Re: Benq FP19G+ screen will not stay on

Forgot to answer: Yes, the screen is visible if I shine a torch onto it.

Re: Benq FP19G+ screen will not stay on

All but the large 450v 100uF cap replaced.

Both inverter transformers are reading the same.
Transformer part number: (Below is how it appears on a single one)
1J.26049.021
T2713B6427406

I want to test with the top two CC light things connected to the bottom two connectors, but the wires are not long enough, and I don't want to power up without the board being secure, and covered.

Re: Benq FP19G+ screen will not stay on

Thanks for replying. I've swapped the in-line images to attachments.

The green LED stays on, after screen blanks.
After more reading, I agree it is the "2 second to black" problem.

I've done some tests with the CCFL's. I believe they are in pairs on this screen. With the top two connected only, the display works for a second, as before, but with the bottom two connected only, the screen does not light up at all.

Looking at the circuit again, there appears to be a repeated section (transformer,...

Hello! My first post here!

I have an old Benq FP19G+ screen and I have the following symptoms when I power on the display:
[LIST=1][*]LED comes on green[*]After about 1 second, the purple BENQ splash screen is shown for about 1 second[*]Screen blanks for about 1 second[*]My windows desktop is displayed for about 1 second[*]Screen blanks, and stays blank.[/LIST]

If I turn off and back on, the same as the above happens every time.
If I disconnect the VGA cable (while power is still on) and reconnect, I see my windows desktop again, for 1 second, before...