HP w22 Monitor display disappears after about 2 seconds

On the Compaq monitor I worked on, I tried using heat and cold to affect the symptom, but in the end, I had to replace the chroma board and not the power supply board to get the monitor to operate normally. In my case too, the boards looked new. This has to be a design flaw or weakness

Tmagic650,

This may not be permanent but you can see my monitor guts

Not enough posts yet (djlewis.us/files/hp-w2207h/) to post a link.

Your reply is less than encouraging ;P

Bubba

Yes that looks exaclly like the Comjpaq LCD monitor I am talking about. No bad caps, no bad power supply. The Tsun* IC is the chroma IC. It sends a signal to the power supply to "turn on or off" the backlight. This IC might be the cause of the trouble. i no longer have the equipment "or eyes" to remove or install large surface mount IC's. Very nice pictures by the way...

Tmagic650,
I did some testing, there is not much in the way of signals between the two boards.
Power = +5, gnd = gnd, sense + = +5, pwr = +3.3, sense - = 0,
brightness is the only sig that changes, before power = about 5% pwm,
during power = 90% pwm, after the 2second on state = 50% pwm.
So it puzzles me as to how the logic is shutting down the high voltage to the bulbs.
I may look at it more later in the week..

Bubba

You can't really test a logic control IC that way. There are no schematics available either. I only know the problem is with this board because I replaced it and the monitor worked... Replacing the power board had no effect on the symptom. I never heard back from Bill on this

HP w22 display disappears after about 2 seconds

Tmagic650,
I'm sorry I that I didn't get back to you MUCH earlier. I thought I had, but when I saw your note I realized that I hadn't.
I never did fix that monitor. I got a different one from eBay and my neighbor liked it. That solved the problem as far as he was concerned, but the original monitor is still in my basement, and still broken.
I found a local tech who fixes monitors. I paid him to come and look at it. I told him that I'd work for him for free if he'd teach me how he fixes monitors without a schematic.He talked a lot, gave me some ideas on who made the boards, but never did find the problem with the monitor. I haven't heard from him since.
I've been unable to find another monitor of that particular model from which to cannibalize parts. The project is now on the back burner while I do my spring yard work and some house hold renovations.
Again, I thank you for your input.
Be well.
Bill

Hi Bill,
Thanks for the update... I can't find any of these monitors either on EBay any longer. I suppose that a motherboard repair center could replace the Chroma IC, for $60 plus parts. With LCD monitor prices dropping like they are, its just not worth spending any time and money on these

Hi HogWillie,

thank you for the reply and update. Yes I love that it is spring now.
Gotta replace my riding mower's wiring harness as the field rats
ate all the insulation this winter.
I feel very comfortable trouble shooting most any electronics
as I have for some 45 years now. Even went to college in my
30's for a dbl degree in Electronics and Computer Engineering
Technology. Got halfway done before divorce caused me to have to
quit. I wanted to improve my analog/digital design capabilities.
Been working on computers and related peripherals since
1978, including monitors. So anyway I am comfortable troubleshooting.
But alas I am not so comfortable replacing the hi density ic's of
today. I need a new glasses prescription ..

Bubba

Yes Bubba,
I'll turn 60 this June. I retired from motherboard and electronics component-level repair in 2000. I started repairing computers in 1976 with the Digital PDP8. It took 45 minutes to boot up. Those were the days

The answer to my HP w2207H shutting off

Hi guys, I finally got around to more troubleshooting on this big ol monitor. Turned out
it was a bad ccfl. One bulb had gone bad and also one end of the bulbs insulator had
been burnt through by high voltage. I ordered a 4 bulb kit from:

http://www.ccflwarehouse.com/24x48fuspcc1.html

along with some new end caps and tiny round nylon spacers. bulbs arrived in a plastic
bag inside a hard plastic tube in side some paper packing inside a trianglular shipping
box.
I didnt need the cheap soldering pencil but heck, I wanna do some wood burning anyway.

Bubba

Thats great Bubba, glad you got it fixed...

Hey guys, I know this is an older post, but I've been scouring the internet to find a way to remove the bezel. Am I missing something simple?

How do I get the plastic off of this beast?

Thanks!

It's been a while since I worked on one of these now. There are 4 small screws, 2 on each side. You can reach these screws after carefully prying apart the plastic case with a rather large flat blade screwdriver

I actually figured it out RIGHT after I broke a couple of the Plastic pieces. Maybe they sell replacement back panels.

I thought maybe it was a capacitor issue, but all the caps look good. I'm thinking it may be one of the CFLs like the person above had an issue with. I'll be scouring this thread for a while I think

Thanks for the snappy reply!

I don't think any parts are available for this old heavy monitor. If you get momentary video, it is probably a video processor fault

Is that fixable or does that mean this thing is probably shot?

I was able to get a video processor from a broken used monitor, and it fixed on of the monitors I was working on... This was over a year ago

Is there any way to test the processor or diagnose why else it might be having a problem? I'd hate to scrap it.