lp2407 aka fpd2485W No Power

[UniT3d]

Re: lp2407 aka fpd2485W No Power

Hmmm .....

I'm making simple assumptions here. Assuming your unit is crossing over 5 years old or more, replacing all secondary capacitors now is highly recommended. Caps does not have to be swollen/domed to be borked.

Those linear regulators can get borked by many reasons and one of it is out-of-specs capacitors on the secondary. Wouldn't want those newly regulators to get borked again in a few months ..... hmmm?

Based on your regulator output lists above, I'd say chip 3 and chip 4 are way off the mark and needs replacements.

[geep]

Re: lp2407 aka fpd2485W No Power

Well one of these monitors lp2407 landed in my my hands. The symptoms include no back lighting no image with flashlight. It is powering on and off and staying on with the touch button when signal from PC is applied and does its little chime sound when turned on. I have replace all the caps with a kit of eBay all nichicon and Panasonic caps. I did the test explained in this thread and when testing power from the power supply to inverter board i am getting
1-26.1
2-26.1
3-0
4-0
5-5.1
6-0
7-3.2
8-0
pin 7 dose not seem to be right any ideas

[selldoor]

Re: lp2407 aka fpd2485W No Power

You also need to test the voltage regulators as mentioned earlier.
A good guide on finding testing and posting results is here:
https://www.badcaps.net/forum/showpo...29&postcount=1

[geep]

Re: lp2407 aka fpd2485W No Power

here are my voltage regulator outputs

u601 Ld117a-133ATK
1=0
2=3.27
3=5.20

u602
AIC 1084 33pm 67918
1=0
2=3.28
3=5.20

u603
AZ117D 1.8E1 639n42
1=0
2=1.79
3=3.28

u604
7CJL 17 18L
1=0
2=1.78
3=3.26

u605
LD117a-133ATk
1=0
2=3.26
3=5.19