Hannspree HF257 w/bad backlight

[Jim1590]

Re: Hannspree HF257 w/bad backlight

bluesj,
You did seem to drag up an old post but I can say that yes, replacing the power board may help you.

I had the same issue on my Hannspree that I liberated from the town dump with the 2 seconds to black. I could not find any bad caps and the problem seems to be with the back lights. The back light board is built into the power board.

Fret not, I got myself a board shipped from China for $25. Put it in and am using it now. Has been running for 3 hours straight.

http://www.boardss.com/index.php?mai...oducts_id=1150


Now to find a way to get the light scratches off the display. Why do people want to key LCDs that they trash?

[bluesj]

Re: Hannspree HF257 w/bad backlight

After changing the caps, the board was still not functioning properly. Recently I was Christmas shopping online and searched eBay for the power supply number and finally got a hit.

You can purchase an almost identical board on eBay for $34 - free shipping. Search by your board part number and you will find one one digit different (the board is for a HH251). I looked at it and it looked exactly like mine. I ordered it and it looks exactly the same and ... it works perfectly.
FSP060-2P109
eBay store "monitor-09"

so the culprit was the power supply board? and you completely repaired the HF257 monitor?

[bluesj]

Re: Hannspree HF257 w/bad backlight

Hi.. I have a hannspree HF257 monitor
but it has '2 seconds to black' symptom if the brightness is maximum
and when i set the brightness to the minumum (zero), it flicks several times and there are some electrical noise and eventually go to black...

first of all,Could you let me know how did you disassemble the monitor?

now i disassembled the monitor.. caps are not burged... what should i do?

[bluesj]

Re: Hannspree HF257 w/bad backlight

Hi.. I have a hannspree HF257 monitor
but it has '2 seconds to black' symptom if the brightness is maximum
and when i set the brightness to the minumum (zero), it flicks several times and there are some electrical noise and eventually go to black...

first of all,Could you let me know how did you disassemble the monitor?

[abeeftec]

Re: Hannspree HF257 w/bad backlight

Hello,

I have this monitor and have had it since 2009.

My brother was complaining for a good while that he had to turn it off and back on again. I didn't believe it was the monitor but I was obviously wrong.

Because now it has the 2sec2black issue.

I heard someone ask a question on another thread like, " Did you shine a flash light on it?"

I wasn't sure if they meant directly into the front of it. But if so, Yes I did that and didn't see any image after it turns off. I also shined the light at an angle to it and no image.

The Image comes on for a second and then black.

The blue on light does stay on.

Any Ideas?

Thanks!

[silverdelta]

Re: Hannspree HF257 w/bad backlight

megaman007 do you still have the board available? I would be interested in buying it from you.

[PlainBill]

Re: Hannspree HF257 w/bad backlight

If that's the case, couldn't I switch the 7.5ma/8.0ma jumper to provide more current and see if that fixes the problem? Or will that likely send the whole damn thing up in smoke?

Pennsylvania BTW

By all means move it to see if it makes a difference. But in the designs I have studied, the OCP (over current protection) setting is separate from the lamp current setting. Changing the current setting will not affect the OCP trip point.

PlainBill

[megaman007]

Re: Hannspree HF257 w/bad backlight

If that's the case, couldn't I switch the 7.5ma/8.0ma jumper to provide more current and see if that fixes the problem? Or will that likely send the whole damn thing up in smoke?

Pennsylvania BTW

[PlainBill]

Re: Hannspree HF257 w/bad backlight

I'll second jayoung's comments. I'd suggest listing it for sale on Craigslist (or whatever equivalent is available in your area). I'd say someone would be eager to buy it and put $40 of CCFLs into it.

PlainBill

[jayoung]

Re: Hannspree HF257 w/bad backlight

Could very well be aging ccfl's. As they age, they draw more and more current until it gets to the point that it trips the sensing circuitry causing the 2 seconds to black issue. With the brightness turned down, the current draw might be lowered enough to avoid the 2 seconds to black. Do you by chance have access to any "spare" ccfl's?

I purchased some replacement ccfl's from www.CCFLwarehouse.com through e-Bay not too long ago for a 19" monitor that I fixed. I didn't have any issues with them.

Hopefully you won't send the monitor to the landfill and instead find someone or someplace to "recycle" it. Where are you located? Someone on the forum may be interested in it if you decide to part ways with it. There are many places that do electronics recycling and would gladly accept it.

[megaman007]

Re: Hannspree HF257 w/bad backlight

the power light stays on and the display shuts down almost immediately. If I screw with it long enough to turn the brightness & contrast down, the display don't shut down. But once it turn it back up, it shuts down again. And with a white background, I can tell there is still a picture on, just not lite up enough to actually see what is happening on screen.

This made me assume if was the inverters and order the replacement power board. But, well, it turns out that was not what was bad, since it did not fix my problem. I'm not sinking one more penny into it. I've got a 24" Dell LED display to fill the gap and considering how shady the tech support at HannSpree is, I'm probably better off just selling the part & parting with the damaged display too.

[jayoung]

Re: Hannspree HF257 w/bad backlight

What are the symptoms of your monitor currently? When turned on, does the display show for a few seconds and then shut off? Does the power LED stay green / blue?

You may have an issue with the ccfl's (disconnected wires, broken ccfl's, dead ccfl's, etc.) If this is the case, there are places where you can buy replacement ccfl's and install them yourself.

[megaman007]

Re: Hannspree HF257 w/bad backlight

After changing the caps, the board was still not functioning properly. Recently I was Christmas shopping online and searched eBay for the power supply number and finally got a hit.

You can purchase an almost identical board on eBay for $34 - free shipping. Search by your board part number and you will find one one digit different (the board is for a HH251). I looked at it and it looked exactly like mine. I ordered it and it looks exactly the same and ... it works perfectly.
FSP060-2P109
eBay store "monitor-09"

I did did this following your advice and unfortunately for me, it did not fix my backlight problem. So I guess my monitor itself is bad. I was sure the board was the issue because the original was blackened and with the backlight turned down all the way I could still see my display on.

I don't think something I paid 34USD is worth shipping back to China, so if anyone in the USA or Canada is looking for one, try contacting me and you can buy the one I just got my hands on. Hey, beats waiting for a package from China. Right?

[rasterdan]

Re: Hannspree HF257 w/bad backlight

After changing the caps, the board was still not functioning properly. Recently I was Christmas shopping online and searched eBay for the power supply number and finally got a hit.

You can purchase an almost identical board on eBay for $34 - free shipping. Search by your board part number and you will find one one digit different (the board is for a HH251). I looked at it and it looked exactly like mine. I ordered it and it looks exactly the same and ... it works perfectly.
FSP060-2P109
eBay store "monitor-09"

[MikeB]

Re: Hannspree HF257 w/bad backlight

Thanks. It's apart.

[killian6pk]

Re: Hannspree HF257 w/bad backlight

You need to watch video on You Tube about how to take these apart. They are not hard but, you can mess up the case pretty bad while trying to take them apart without learning how. Check the repairing LCD Monitors videos and most show how to take them apart. Also as said by someone earlier take plenty of pictures as you go through each stage of taking the monitor apart.

[killian6pk]

Re: Hannspree HF257 w/bad backlight

Just for information purposes HannsSpree , HannStar and other names are used by this company. They produce monitors for Staples the office supply company and probably several more I have not found out about. From research into this company on the internet they seem to either be going into bankruptcy or just coming out of bankruptcy. I would be very careful in buying their product. I have searched repeatedly for service manuals etc. for them without any luck. If anyone has schematics or service manuals the the 19" models I sure could use a copy.

[MikeB]

Re: Hannspree HF257 w/bad backlight

I have a HF257 that is dead as well. The usual screen barely on for 2 seconds and then black. I have read all comments/suggestions which will be very helpful, but my question is a very basic one - how to remove the back cover. I removed the four screws, but the cover is still very securely attached. I obviously don't want to break the plastic case. Is there another hidden screw holding this together? It's clear that you all have gotten past this stage. Any help/phots would be much appreciated. Thanks.....

[v3ng3nz]

Re: Hannspree HF257 w/bad backlight

I have the exact same problem

Searched online for a couple of friggn days for a replacement. Manufacture was no help, first I emailed for a new inverter and they said I could order the part. I called and waited bout 30 minutes for sales rep, which said no, he then said I could send it in for repairs... Then I asked how much is a minimum charge I would have to pay. Told me to call back in a couple of days and they would have a quote ready...... for a minimum charge. I didnt call back. Last time I am buying from this company - buy buy HANSPREE...

I eventually did the hack you were referring to and would work fine for a second and shut down..same problem. flashlight to screen showed image just fine. going to solder the old inverter back in and change jumper to 8.0 ma and see if fixes... will post back to confirm and see if it fixes

BTW Thanks for giving so much info in post!

PS: If this fails, am going to make a led bar for this thing.

[sparkythefiredog]

Re: Hannspree HF257 w/bad backlight

I have the hf257 back together and it works for now. If it flakes out I will take it apart again.