HP W2207 no screen no power buzzing!

[bgolpmp]

Hello

I recently picked up this monitor for cheap and am now trying to get it back up and running. I have spent the last 2 days browsing throught the forums with problem, but have not found anything like it.

When I first turned it on I could see the screen switch from 3 diffrent colorl. It went from Balck to Gray to a lighter gray with lines going through it every .25 inch or so. There was a hum in the back sounding like maybe a mouse??
Today I was going to take some pictures of the screen colors and post them up here but when I plugged it in all I got was the mouse hum coming from it and no power light that I could see.

I took the unit apart thinking I was going to find some bad blown caps, but everything in there looked fine. ( when I had it on, I could not smell anything burning or smoke)

I have hooked it up to the computer with both kinds of cables and could not get it to work. I did a reset and still nothing

Thanks for the help

Andy

[bgolpmp]

Re: HP W2207 no screen no power buzzing!

I guess I have never seen a blown cap. I just checked some pictures and it appears I have a few. What are the chances that is the problem? What kind of caps are recommended on these devices???

Thanks

[Scenic]

Re: HP W2207 no screen no power buzzing!

I can see at least 2 bulging capacitors in those photos.
The two to the left of U502.
They all look to be Su'scon, which are known to be complete garbage (much like HP in general these days, but that's another story..)

[dumpystig]

Re: HP W2207 no screen no power buzzing!

^ yeah, those 2 at least - closer, well focused pics of the boards makes all the difference.

[bgolpmp]

Re: HP W2207 no screen no power buzzing!

So would I be safe to assume that the caps are my problem??? Should I replace all of them on both boards???

Thanks

[retiredcaps]

Re: HP W2207 no screen no power buzzing!

So would I be safe to assume that the caps are my problem???

I have this exact same monitor with the same 2 caps bloated. I recapped the monitor back in June 2010 and it is my main monitor. I suspect those 2 caps are dried out due to the heat from the IC mounted on the heatsink.

You should recap all the caps on the power board as they undergo the most stress.

Here is my

--- standard answer, regulars can skip ---

https://www.badcaps.net/forum/showpo...84&postcount=3

[bgolpmp]

Re: HP W2207 no screen no power buzzing!

Thanks for the replys

I was looking on the net for caps and was looking on mouser and they had so many diffrent styles of caps. What do I need?? Axis? Radial? Snap In?? Is mouser a good place to but them?

Thanks

Andy

[retiredcaps]

Re: HP W2207 no screen no power buzzing!

What do I need??

If you click through my earlier post, there is an example on how to order caps with all the parameters. More specifically

https://www.badcaps.net/forum/showpo...4&postcount=19

[bgolpmp]

Re: HP W2207 no screen no power buzzing!

Well

I recieved all new caps and replaced them. The monitor is doing the same thing. It flashes from a white to grey to a darker grey and keeps doing this. It switches colors about every second. I have tried diffrent cables and get the same. What would be the next most logical reason for this, and how would I go about testing it????

Thanks for your time!!!
Andy

[retiredcaps]

Re: HP W2207 no screen no power buzzing!

1) Post a picture of the newly recapped power board.

2) Reseat and clean every connection on all the boards including the ones to the top of the panel board. I use isopropyl alcohol.

3) Try a factory reset to defaults from the menu.

[bgolpmp]

Re: HP W2207 no screen no power buzzing!

OK I tried sll of those things, and still have the same result. I did take the pictures of the recaped board.

Thanks


Andy

[retiredcaps]

Re: HP W2207 no screen no power buzzing!

1) Post a picture of the main board.

2) Do you have a multimeter? If yes, are you familiar with using it to take DC voltage?

[bgolpmp]

Re: HP W2207 no screen no power buzzing!

ok I believe this is the main board? It is the only other board in the tv except for the one on the bsck of the screen. Anyways yes I have a multi meter and I can read it.


Thanks!!!

Andy

[retiredcaps]

Re: HP W2207 no screen no power buzzing!

1) Marked in yellow are 3 voltage regulators. Report the DC voltage on each pin. You don't have to measure the fat tab. Report the part number as well. For example,

U1
part AS1117-33
pin 1 = 0.0V
pin 2 = 3.31V
pin 3 = 4.99V

2) In red is the connector to the power supply. Measure each pin and see if all the voltages are stable or fluctuating. Report the voltages in a similar format as above. Make sure to include the legend from the power supply so we know what the expected voltage should be compared to the actual.

[bgolpmp]

Re: HP W2207 no screen no power buzzing!

OK

I took my meter from ground on the 14 pin power plug and here are my results

U113
LD1117A
L33AUC
All voltages 0.01

U102
1084-18
0640AL
Pin 1 .013
Pin 2 1.8
Pin 3 5.19

U101
1084-33PM
503IC
Pin 1 .013
Pin 2 3.321
Pin 3 5.03

On the 14 pin connector pins 5 6 10 and 11 are all ground
from ground to pin 1 .012
pin 2 .012
pin 3 .690
pin 4 2.27
pin 7 3.3
pin 8 .049
pin 9 .009
pin 12 5.03
pin 13 5.03
pin 14 5.06

Thanks

Andy

[retiredcaps]

Re: HP W2207 no screen no power buzzing!

U113
LD1117A
L33AUC
All voltages 0.01

1) U101 and U102 are good.

2) U113 may have failed. If you measured it correctly, pin 2 should have been 3.3V DC.

3) Check the dimensions, but this should work

http://search.digikey.com/us/en/prod...28-1-ND/586228

4) In #2, I say "may" because there are 2 SMD fuses on the main board (circled in blue). Check both. A good fuse should measure less than 1.0 ohms. If one or both are open, it could affect the readings U113.

5) In post #12, I asked you to post a picture of the main board, but neglected to see that you already provided that in post #1. Sorry, my bad.

Probably lack of sleep that day.

[hapollo]

Re: HP W2207 no screen no power buzzing!

OP, was this ever resolved? I've got the same readings on U113 but wondering if you ever replaced it and got it back up & running.

[killian6pk]

Re: HP W2207 no screen no power buzzing!

You are probably not going to get a reply.
Start a new thread and take pictures as requested. Don't copy someone else's pictures as your model could be a different revision and be set up differently.
If you have not, do a search for this model and number within the Troubleshooting computer Displays section. Read through all of them. You will probably get your questions answered. If not someone will help you.

[Davi.p]

Re: HP W2207 no screen no power buzzing!

hapollo does your monitor have an usb hub? If yes that 1117 reading can be ok, try to hook a pc on monitor usb port and see if the reading changes.. if 3,3v on center pin appear so you can start to consider (for the few experience i have) to buy another mainboard. I think that if you never see the OSD menu is there a probability that an overvoltage producted by bad caps have corrupted the firmware on main mcu/scaler chip, if you want to spend many nights to find the correct SW to upgrade the firmware maybe someone here can tell you if is an useful try..

[mgaa80]

Re: HP W2207 no screen no power buzzing!

Hello everyone :-)

greetings to the US, my name is Matthias and I'm from Germany.

I hope somebody can help me - I've recently bought the HP w2207 monitor and I'm now trying to repair it.

The issue is: It won't turn on. Only the signal LED from power button is blinking.
I disassembled it and replaced all caps from the power board (except the huge cap), but the issue reamins -> Only blinking LED.

I did some measurements with my multimeter & I get fluctuating voltages out of U101 and U102 / U113 has 0 volts.

I used pin 11 from 14-pin connector power board as ground.

U101
AIC
1084-33PM
Pin1: 0v
Pin2: 2.7-3.2v
Pin3: 3.9-7.3v

U102
AC
1084-18
0707BL
Pin1: 0v
Pin2: 1.7-1.8v
Pin3: 3.8-6.9v

U113:
A1
AS1117L-33
80652 84
Pin1: 0v
Pin2: 0v
Pin3: 0v

My problem is that I'm a newbie in electronics & I don't really understand what this measurements try to tell me...maybe someone of you guys can tell me? :-) I'd very much appreciate it!

I attached pictures from the main and power board.

Many thanks in advance!

Matthias