# HG changeset patch # User "Arthur Lutz " # Date 1609886636 -3600 # Node ID 0c9f5038fc630a27f5ec6d176440365d380eb84a # Parent f4160af0485c85823d9e829bae2c00b00a2e6297 [content/dell2407] a few typo fixes diff -r f4160af0485c -r 0c9f5038fc63 content/dell2407.rst --- a/content/dell2407.rst Sat Nov 07 15:49:10 2020 +0100 +++ b/content/dell2407.rst Tue Jan 05 23:43:56 2021 +0100 @@ -66,13 +66,13 @@ controller (L6561D) in charge of providing a nice B+ DC rail for the PWM controller (NCP1200A) driving the main transformer. -I could easily find datasheets for these 2 chips. But the noce thing when +I could easily find datasheets for these 2 chips. But the nice thing when fixing such a mass produced device is that obviously some other people already had a similar failure to fix. It seems that the problem my monitor suffered is a very common one. I found a `long thread `_ -(obviously on https://www,badcaos.net) where people discuss this flaw and their +(obviously on https://www.badcaps.net) where people discuss this flaw and their quest for fixes. Which led me to a PDF with the full schematic of the PSU (which is in fact a BenQ brand). @@ -92,9 +92,9 @@ .. image:: {static}/images/dell2407wfp/L6561-AN.svg :alt: Typical application schematic of the L6561 PFC controller. -As tou can see, it is very similar to the first page of the schematic above. -This later have the extra power button management circuit, and a few details -and compenent values are different, but overall, a very close application of +As you can see, it is very similar to the first page of the schematic above. +This later has the extra power button management circuit, and a few details +and component values are different, but overall, a very close application of the typical application schematic (as expected). And for the PMW stage, I could not find such a typical application circuit more @@ -150,7 +150,7 @@ .. image:: {static}/images/dell2407wfp/junk_pcb.jpg :alt: The PCB from which I took an APT8075BN as test Q651 replacement. -The leads qre not exactly the same spacing, but I managed to do something: +The leads are not exactly the same spacing, but I managed to do something: .. image:: {static}/images/dell2407wfp/apt8075bn.jpg :alt: The APT8075BN used as test Q651 replacement. @@ -159,7 +159,7 @@ Which resulted in a rather acrobatic setup: I did not want to fight to make it fit nicely enough that I can screw it on the heatsink (plus it is not insulated, like the original transistor, so I would have had to find an -insulator. I have some, but finding them would have required a bit fo digging +insulator. I have some, but finding them would have required a bit of digging in my overcrowded empire of dirt). The resulting setup looks like: @@ -170,7 +170,7 @@ However, before applying power again, I checked all the silicon components once more. And I discovered (what I missed the first time) that Q653 was also dead. -The problem was I had no proper SOT23 replacement part for it. THe good news is +The problem was I had no proper SOT23 replacement part for it. The good news is I do have a few 2N7000 that can be used, but are TO92 packages. So I did a bit of surgery: @@ -197,7 +197,7 @@ :alt: It's alive! -However, before closing the box, I did a few tests and measurements, for the +However, before closing the box, I did a few tests and measurements, for fun. I found the reason for the properly working 19v rail when unloaded at the beginning: in fact, the L6561D PFC chip is only turned on when some load is detected by the NCP1200A controller. This allows the standby power consumption