HannsG HW173D dead. Recap = new fault.

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

Attached are the pictures of my boards.

I did check the continuity on both fuses and they check out.

[alexanna]

Re: HannsG HW173D dead. Recap = new fault.

In the first post I see a fuse F240 by the connector to the logic board,It would be a good idea to check it if it's not already been done.
Well i mised you post about F240 you might want to check it with an ohmmeter

[jetadm123]

Re: HannsG HW173D dead. Recap = new fault.

You have two diode packs mounted on the same heatsink. One diode should output 5V and the other 12V. Measure the middle leg of each diode for these voltages. Like alexanna suggested, we need some good focused photos of YOUR boards. Referencing someone else's board photos hinders the troubleshooting process.

[alexanna]

Re: HannsG HW173D dead. Recap = new fault.

Need a good pitcure of both top and bottom of Inv./P.S.

[alexanna]

Re: HannsG HW173D dead. Recap = new fault.

I think the reading you are seeing is a 500mv voltage drop on the ground side of the board.
What voltage readings do you get on the other pins using a plated ground screw for your ground?
Your edit changes things so disregard

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

Forget what I said about not getting power to the Logic Board. I was using a ground not associated to the pins connecting the two boards. I saw where there was a ground on one of the pins. One pin said it should be 12v and I have 0. The other pin says 5v and I have a reading of .5. This was a DCV reading. Now what?

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

I removed the black one (F240) and got a diode reading of .001. When you said "without mains connected" I assumed you mean removing the part.

[Scenic]

Re: HannsG HW173D dead. Recap = new fault.

if the PSU/inverter board looks like the one i've linked in post #28, there are 2 fuses.
the mains fuse F101 (brown-ish cylinder below the ground wire at the mains socket) and F240 (black cube to the right of the pins going to the logic/LCD controller board)

looks like there was a place for another one of those fuses right next to that connector that just has a jumperwire in it..

measure it in diode test mode or low ohms mode. (without mains connected!)
if your multimeter says 0L or something like that it's open/bad

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

After having said that I see that I have no voltage going through to the Logic Board. What can I check now, and do you know where the fuse is located? Thx for all the help.

[Scenic]

Re: HannsG HW173D dead. Recap = new fault.

the output voltages from the inverter/psu board to the lcd controller board.

the voltages supposed to be on that connector are kinda visible on this pic in the first post (below the pins on the bottom left)
https://www.badcaps.net/forum/attach...7&d=1265410253

if those are all there and in spec (mainly the 5V and 12V), the next suspects would be those voltage regulators on the LCD controller board for 1.8 and 3.3V.
if these are dead (no output or too low), the controller chip in the center of that board has no voltage and the whole monitor plays dead, even if the PSU/inverter are working fine..

edit: the voltages might also be printed on the solder side of the inverter/PSU board if you're lucky. would make it a bit easier..

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

I check the the solder side of the Inverter Board and I have power on the board. Is there a part on that board that I need to check that feeds the Logic Board?

[Scenic]

Re: HannsG HW173D dead. Recap = new fault.

hm... do you get any output from the powersupply..?
if so, those voltage regulators could be shot.. seems strange that both died though.. *scratches head*

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

I placed the boards back into the monitor and connected everything. Each regulator pin reads a constant 0.0V.

[retiredcaps]

Re: HannsG HW173D dead. Recap = new fault.

Looks like your multimeter is working correctly.

Try measuring the voltage regulators again and see if they DC V is fluctuating or not.

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

1) .0

2) AAA is 1.5

[retiredcaps]

Re: HannsG HW173D dead. Recap = new fault.

Is the reading suppose to be constant, or does it keep changing and then go to 0V?

It should be constant.

Let's make sure your multimeter is working correctly.

1) If you put it on 200 ohms and touch the red and black probe together, what do you get?

2) Now put it on 20V DC and measure a new AA cell (battery). What do you get?

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

Is the reading suppose to be constant, or does it keep changing and then go to 0V?

[retiredcaps]

Re: HannsG HW173D dead. Recap = new fault.

I checked across each of the leads on the 1.8V and got a reading of 1V (cannot do 10th). On the 3.3v I got a reading of 1V.

Let's make sure you are measuring this correctly.

Put your multimeter on 20V DC (if manual). Put your black probe on a ground screw and leave it there the whole time. For each voltage regulator, put your red probe on all the pins one at a time. Report measurement for each regulator and each pin.

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

I checked across each of the leads on the 1.8V and got a reading of 1V (cannot do 10th). On the 3.3v I got a reading of 1V.

[slvfox2008]

Re: HannsG HW173D dead. Recap = new fault.

Thx for the info. Being new at this, how do I go about testing?