Re: Dell 2405FPW - Power Supply Issue


Yes, I'll definitely won't forget to do that once I get some other signs of life out of the monitor!



Yes, the behaviour of this logic is functioning correctly:
- Power button works as expected.
- The brief green screen with backlight flash is repeated at each iteration
- The monitor also has 4 front LEDs which should indicate the input source and they rotate accordingly with their own dedicated button.

As requested, I've attached pictures of the all the other boards....

Re: Dell 2405FPW - Power Supply Issue

Update:
As this video confirms at 1:58:15, [url]https://youtu.be/rQwCqatbLr4[/url]
this psu actually differs from the one in the schematic and it seems that 19V on pin 4 and 7V on pin 7 should be correct.

However, after replugging everything together I still get a very brief flash onto a green screen followed by darkness.
Do you think I should start looking at the tdk backlight board next?Re: Dell 2405FPW - Power Supply Issu...CqatbLr4[/url]

Re: Dell 2405FPW - Power Supply Issue

Hi momaka, thank you for your interest

I was able to measure around 19.2V on the positive lead of C711, C712, C713, C714, C715 so that line seems to be fine.

Next, I made sure that the positive lead of C702 is well connected to pin 7 of CN701.

I also improved my solder joints further and was now able to measure 7.12V on pin 7 (and on the positive lead of C702) instead of 19V. I followed this line back to the two following resistances:
- R712 gives 7.12V on the side closest to the connector...

Re: Samsung LS24F354FHNXZA - partially working no standby

What about C807 on the top left? It does not look super healthy

Hello everyone,
I'm writing here hoping to fix my Dell 2405FPW monitor.

I was able to unbuilt the assembly and discover that the main power supply (48.L1E02.A03) had a few bulged capacitors (C702, C711, C712, C713, C714, C715), while the remaining ones (including the massive 450V one seem to be intact).

After replacing them, I was able to measure that the top connector (CN702) that goes into the backlight TDK board correctly receives 19V on pins 4/5/6, and that the connector to the other board with the display inputs (CN701) receives 19V on pin 4 but nothing...

Re: New Members - please post your introductions here

Hey everyone! Looking forward to learn some useful knowledge