Re: Viewsonic vx2435wm problems

Power switch has 2 contacts on one side, and 3 on the other. It beeps when checked btw contacts 1-to-1, 3-to-3 in any position. It also beeps btw contacts 1-to-2 and 3-to-2 when holding it depressed, and shows OL when not depressed.

LED diode shows 1400mV / OL under power, and OL / OL when its wires are disconnected. The monitor should normally work even without this LED, as posted in another thread. I have it disconnected, and this gave no change in board voltages.

Re: Viewsonic vx2435wm problems

I asked about FS2 because it powers pins 1-4 of the main board connector, and they read now 5.8VDC, when the main board is disconnected, so FS2 is passing voltage to the pins. Also, voltage btw 2 opposite contacts of FS2 is 0V. it reads 300Ohms. Tested FS1,2,3,4 again, no change. Meter batteries are good, since 16.8VDC is measured all the time on the same meter setting with boards connected or disconnected.

I didn't connect HDMI cable before, now I attached it to PC and the monitor, but voltages didn't change, the same as reported [URL="https://www.badcaps.net/forum/showpost.php?p=610936&postcount=19"]here[/URL],...

Re: Viewsonic vx2435wm problems

Strangely, I checked voltages under power on the Power Supply directly again today, and the results are different:

1. Power Supply is connected with both Main and Inverter Boards

Connector to the main board from red wire to the left:
0.15, 015, 015, 015, 16.8, 16.8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.15
Connector to the inverter board from red wire to the left:
0.15, 0, 0, 0, 0, 0, 0, 0, 0, 11.5, 11.5, 11.5, 11.5, 11.5

2. Power Supply is connected with Inverter Board only

Connector to...

Re: Viewsonic vx2435wm problems

My typo, CN2 has 14 pins, you marked 2 extras correctly. No 5VDC for sure.

I can't find J72 and J73 on this board, can you mark them on the PSB picture? Is it possible, your looking at a 2nd version of the same board from another thread, it has the same size, but a different layout and heatsinks with more ribs? There's JP3 next to CN2 and CS21 cap under the heatsink on my PSB, it beeps OK. Don't see any jumpers around CN2 on the bottom side either.

Does the fuse FS2 at 300Ohms sound burned?

I traced Ground pins...

Re: Viewsonic vx2435wm problems

Voltages on the output sockets with power cable connected:

Connector to the main board from red wire to the left:
0.35, 035, 035, 035, 16.8, 16.8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0.35

Connector to the inverter board from red wire to the left:
0.35, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 28, 28, 28, 28, 28

Pressing Power button on the monitor cover doesn't change anything. Couldn't find J72 and J73 jumpers. But I checked all jumpers on the power board, and they all beep. Double checked fuses, and only FS2 gives...

Re: Viewsonic vx2435wm problems

Yes, the bottom PSB pic is from mine. Sorry to ask a stupid question, but which one is the ground screw on this power board? Is it the one next to red wire, though that screw doesn't look connected in the circuit? Or the opposite screw on the same side, which is connected in the circuit line passing under FS4 fuse, but not through it? Or the screw on the other side with like a ground sign next to it?

Why there's only one red wire on each connector, what the red color marks? If you can refer to component IDs on the PCBs, I could find...

Re: Viewsonic vx2435wm problems

The fuse FS1 gives continuity sound on the multimeter. The big cap CK1 shows 190V.

Re: Viewsonic vx2435wm problems

Hi there,

I'm not an expert in electronics by any means, but can do some testing and repairs with a multimeter and soldering iron. This is a review of [URL="http://www.trustedreviews.com/ViewSonic-VX2435wm-24in-LCD-Monitor-review"]ViewSonic VX2435wm[/URL] with detail specs. Attached are my board pictures, can take more. Found also some pic of the power board without heatsinks on the forum.

Where should I start, if you don't mind asking such question? Re: Viewsonic vx2435wm problems

...

Re: Viewsonic vx2435wm problems

Hi everyone,

I'm new to this forum, so please be tolerant. I have the same monitor VIEWSONIC VX2435WM, it worked great for awhile, and suddenly stopped working. I read all the info above, and this seems to be the only thread about this monitor on the forum. So keeping it all in one place... Answering above Qs, my monitor doesn't power on anymore, it doesn't react on Power button, and power light is not lit.

Where should I start troubleshooting? Please don't suggest to buy a new one. I'm aware about this option.

Re: New Members - please post your introductions here

Hi all,

I need some advice on fixing some used electronics.