Re: Bad Benq 48.L1A02.A31 board for Hp1955L monitor

i recently had issues with this board too, but im no expert.

i couldn't just find a straight up replacement

when u say its ruined whats it doing? or failing to do?
do u have indicator lights?

Re: Another bad HP 1955 Inverter... probably

ok i posted too soon! was able to resolder the bulb, and modified the bracket. yea its a redneck job. but its working.

and yes i did unsolder the bypass i put on the fuse

thanks for the help guys!

Re: Another bad HP 1955 Inverter... probably

yes! i indentified the problem, it was amazingly difficult.... one of the bulbs is bad lol
the end of the bulb assembly you can see and smell it.

i kinda went for an all or nothing test, shorted the fuse. when i did that i could hear a sizzle from one of the corners of the screen.

any idea where i can get one? or what size i need? i see they are mostly like 2.2 - 4mm and i dont think i have anyway to tell what size it is

but its not really the bulb as far as i can tell its more the...

Re: Another bad HP 1955 Inverter... probably

ill give it a shot retouching the solder on the HV transformers. probably order the caps and fuse this weekend if that doesn't work.

thanks!

Re: Another bad HP 1955 Inverter... probably

i did try testing one lamp at a time, and i did get the result mentioned above, but each bulb did light, i was curious to see if all 4 would light and they did but then it would shutoff.

i do have another screen that a botched the replacement of some c5707s and destroyed a trace (handy i ordered alot of c5707s) so i might be able to use the bulbs from it. it is also a benq board.

i tried testing the c5707's , due to my poor abilit ywith a soldering iron i ripped the pin out of 2 of them, but the ones i was...

Re: Another bad HP 1955 Inverter... probably

ok i replaced all 4 just to be sure, meter i have didn't allow me to test them in circuit. but its still doing the same thing.

it will power up the display for a few seconds then when the dialog switches to check vga cable it then doesn't light but yet the light is green.

not sure where i should look next

I have been watching the forums for some time now and I have been able to fix a few screens with the guidance I picked up here.

The screen I am having problems with is a benq 48.l1a02.a41, I think it's a version 94v-0. I saw several people had articles about this screen and how to fix it.

The problem I am having is the screens backlight kicks off after a second or two right after powering on.

I looked at the capacitors and they are brands that I remember people complaining about (elite for example). None of the caps seem bubbled but I guess that isn't...