DCLCD DCL20 (Scepter) 20" LCD won't turn on

[Rezolution]

Hello,

A coworker was going to throw his monitor out but I said I would take it to see if I could fix it. He said that he was moving it from one room to another and then when he put it on his desk, the A/C cord wasn't plugged in it all the way when he turned the monitor on. Once he hit the power button, he heard a pop, saw a white flash come from inside the monitor, and then the monitor wouldn't turn on any more.

I took the whole monitor apart thinking I would see a popped cap or diode, but I see nothing that's popped, bulged, or burnt at all on the main power board.

Anyone have any idea what I should be checking for? I didn't see anything that looked like a fuse, but a fuse can look like anything now-a-days.

The monitor does nothing when it's plugged in and nothing when you press the power button, no blinking lights, nothing at all. I only inspected the power board, not the video board though.

I can take pics of the power board if someone could tell me where to start looking. I have limited knowledge of newer electronic parts but I'm very good at soldering and using a DMM.

[retiredcaps]

Re: DCLCD DCL20 (Scepter) 20" LCD won't turn on

I can take pics of the power board if someone could tell me where to start looking.

For best picture quality and clarity take your boards to a window on a sunny day, turn flash off, and use macro mode. Take a top down view of all your boards (front and back). Make sure the photo is legible so that we can read the PCB printing clearly. A shutter speed of 1/125 or faster will produce nice clear focused pictures. Try to get a photo that is 2000x2000 resolution or as close as possible.

Here is an example of the pictures we want.

https://www.badcaps.net/forum/showpo...94&postcount=1

Also see my sig on how to attach the pictures.

[retiredcaps]

Re: DCLCD DCL20 (Scepter) 20" LCD won't turn on

I have limited knowledge of newer electronic parts but I'm very good at soldering and using a DMM.

Fuses are marked with a "F" on the pcb board. An example, would be F100. A good fuse should measure less than 1.0 ohms. When measuring resistance, always turn off the power and have the device unplugged.

The next likely candidate to test is the bridge rectifier (marked BD). It has 4 pins. Measure the resistance between pins 1-2, 1-3, 1-4, 2-3, 2-4, and 3-4. Any reading under 30 ohms suggest a possible short (bad).

Both measurements above can be done "in circuit".

[mockingbird]

Re: DCLCD DCL20 (Scepter) 20" LCD won't turn on

Sorry to bring up an old thread. I felt this lesson had to be shared.

I had this monitor sitting around for ages waiting for the opportune time to get re-capped. I finally got some 20mm 16V 1500uF caps (Originals are 25V 1000uF). I re-capped the thing, and voila! it works.

Problem is, the panel is cracked. Next time, I better pay close attention. It was discarded because of the panel, not because it didn't work.

If anyone needs some parts of this thing, let me know.