Dell e171fpb monitor no power or LED lights

[miamiflorida]

Re: Dell e171fpb monitor no power or LED lights

OK, don't know if this is of any help, but I checked for voltage across the IC601 and I'm getting 13.7vdc between pin-6 and all the other pins.

Just so you know I also check voltage on the Transformer (T601) and I'm reading 165vdc on all 4 pins on the bottom side and nothing on the upper side.

If you are able... see picture.

[retiredcaps]

Re: Dell e171fpb monitor no power or LED lights

How should I test the SMPS CONTROLLER as you suggested, that one is labeled IC601.

IC601 is the PCB designation. PlainBill wants you to read the part number off that chip. There is no way we can read that number from those pics.

To get the best pictures, put your camera on macro mode and take the picture next to a window on a sunny day.

[miamiflorida]

Re: Dell e171fpb monitor no power or LED lights

You've made the most important test right there. If you've got 165 volts across the big cap the input fuse and bridge rectifier are good. By the way, be very careful around that cap. It will hold that charge for quite a while. While it probably won't be lethal, 165 volts can give you an attitude change.

Now you also indicted there was no power out of the output connectors. The logical place to look is the smps controller. It is the 8 pin IC in the lower right corner of the last picture. What is the part number?

I understand about cheap cameras. However, the help process is a lot like GIGO in computer programming. The better the information you give us, the better the help we can give you. At a very minimum retake the last picture in natural light without a flash. Glare is a killer - it always seems to be over the the area I am most interested in.

PlainBill

I tried, but unfortunately this camera above 640x480 becomes blurred.

This board is made by BENQ and the part number is; BENQ ETL-XPC-801.

How should I test the SMPS CONTROLLER as you suggested, that one is labeled IC601.

I thank you both for your patience and help

Don't worry about me getting shocked, I am an industrial electrician by trade and I have had received several.

[retiredcaps]

Re: Dell e171fpb monitor no power or LED lights

You've made the most important test right there. If you've got 165 volts across the big cap the input fuse and bridge rectifier are good. By the way, be very careful around that cap. It will hold that charge for quite a while. While it probably won't be lethal, 165 volts can give you an attitude change.

Testing across the big cap for voltage would have been my next suggestion, but I'm personally hestiant writing instructions when I'm tired near midnight.

Especially instructions that involve mains line voltage. And while the OP probably lives in Miami, Florida as the screen name suggests, I would hate to see anyone experince 240V * 1.4 if they should be from Europe.

[PlainBill]

Re: Dell e171fpb monitor no power or LED lights

Sorry about the double post above, anyways...

I'm getting O.L while reading between all 4 pins of "BD601" which I assume is the Bridge R.

FYI there's a 100uf capacitor right behind it and it is putting out 165vdc.

You've made the most important test right there. If you've got 165 volts across the big cap the input fuse and bridge rectifier are good. By the way, be very careful around that cap. It will hold that charge for quite a while. While it probably won't be lethal, 165 volts can give you an attitude change.

Now you also indicted there was no power out of the output connectors. The logical place to look is the smps controller. It is the 8 pin IC in the lower right corner of the last picture. What is the part number?

I understand about cheap cameras. However, the help process is a lot like GIGO in computer programming. The better the information you give us, the better the help we can give you. At a very minimum retake the last picture in natural light without a flash. Glare is a killer - it always seems to be over the the area I am most interested in.

PlainBill

[miamiflorida]

Re: Dell e171fpb monitor no power or LED lights

Sorry about the double post above, anyways...

I'm getting O.L while reading between all 4 pins of "BD601" which I assume is the Bridge R.

FYI there's a 100uf capacitor right behind it and it is putting out 165vdc.

[miamiflorida]

Re: Dell e171fpb monitor no power or LED lights

Thank you,

There's only one fuse, and is good, I've read 125v, 0.3ohms across it as you stated.

I' ll check the "rectifier"

The pictures... (sight) that's almost the best I can get out this cheap camera.

Thank you again...

[retiredcaps]

Re: Dell e171fpb monitor no power or LED lights

My Dell e171fpb after a brief power outage won't power up at all, none of the LED lights on the front will lid, power button will not turn it on at all.

See the attached pictures.

Things to check with there is no power or power LED.

With power off and LCD unplugged.

1) Fuse. A good fuse should be 0.3 ohms.
2) Bridge rectifier. You can measure this in circuit to see if it is shorted. Number your pins 1 to 4 and measure the resistance between 1-2, 1-3, 1-4, 2-3, 2-4, and 3-4.

If these two test are okay, we can give more suggestions.

PS. Your pictures are a bit small and we can't make out all the details. You can post up to 2000x2000 resolution.

[miamiflorida]

Hello Guys,

My Dell e171fpb after a brief power outage won't power up at all, none of the LED lights on the front will lid, power button will not turn it on at all.

I have opened the monitor, it looks like all of the A/C section of the PSU is fine, checked all the capacitors and they seems to be OK, no visible crack, burns or anything obvious.

Now i can't get any voltage out on either of the two connectors going out of the power supply board.

See the attached pictures.

Please any help is greatly appreciated, Thank you...