Re: HP L1955 with Benq 48.L1A02.A00 inverter

Thanks againg Krankshaft, I am now posting from the L1955! Had to make one other "jumper wire" where the copper had cracked too. I know my soldering skills probably didn't help too much but oh, those cheap Taiwanese copper-saving schmucks... Anyways, it's running againg with all Panasonic FC's.

One remaining question regarding reliability: I noticed several people mentioning using a (extended) burn-in testmode. Could someone explain what this is?

Re: HP L1955 with Benq 48.L1A02.A00 inverter

Thanks so much for testing, this really helped me out! Tonight I will repair it and update here. This is really appreciated here on the other side of the Atlantic

Re: HP L1955 with Benq 48.L1A02.A00 inverter

Hi there. I can't trash this board without trying to salvage it (besides that I am not able to find the replacement BenQ 48.L1A02.A00 ANYwhere on the net...).
So this is what I'm going to try, and maybe there's someone to help me with. See the attachment img: I need to make a connection (thinking about a piece of wire, is that a good idea anyway?), from A to one of the 5 marked in purple. But since the broken connection on the "A-side" is located under the TL1451A I do not know to which. Obviously I could desolder the...

Re: HP L1955 with Benq 48.L1A02.A00 inverter

UPDATE: unfortunately I screwed up the board beyond repair I'm starting to believe. The copper trace lifted at two places, one was "fixable" using the not so pretty scraping and bending over the capacitor leg method.

But this is non-fixable I'm pretty sure as the copper has lifted from UNDER the surface mounted 49F6Y4K TL 1451A component. Unless someone familiair with this board can tell me there isn't supposed to be a connection going underneath the component? And it is not the copper trace but just a piece...

Re: HP L1955 with Benq 48.L1A02.A00 inverter

You're right, turned it off and now using my backup monitor (at least 14yrs old NEC MultiSync M700, no problems whatsoever). I will replace the caps and update here.

To be sure: does this sqealing sound and the fact I can use the monitor for over an hour (without casing) mean there is nothing wrong with the 5707's? Or should I replace them anyway when I'm buying parts?

Re: HP L1955 with Benq 48.L1A02.A00 inverter

Thanks for your fast answer! So if I understand correct, a 5707 failure is not really likely to be the cause, since (like now) it has been working fine for approx. 1,5 hours (without cover)? I will look into the soldering, but to be honest, I am waiting for it to fail so I can give it the "backlight-check" with a strong lamp to determine of it is just the backlights shutting down. When you're waiting for it to fail, it off course just keeps working!!


UPDATE: it has not gone black, but when switching it...

I recently bought a secondhand HP L1955 which worked fine for exactly one month (doesn't really matter how long it worked since I have it because it is a secondhand, but anyways).

Then it went black and seemed not to detect the signal, after unplugging it sometimes worked for a while, sometimes not. I pulled the board and found one bulged capacitor (10v, 1000mf, at C709). I replaced it (16v, 1000mf, same heat rating 105 deg C) and it worked fine for 10 days.

Then, after about one hour, it went black. Turning it off (with the "soft" switch, not the main PSU...