Pyramid 7" LCD - No stable picture

[pentium]

I picked up this dinky 12V LCD panel at a flea market and it has at the least a composite video input however when I power it (from a bench PSU), all I see is a white screen with a horizontally unstable picture.



That should be the "PYRAMID" logo (sometimes it's a bit cleaner but it's always looking like that) but as you can see, it's pretty hard to make out.

Inside the unit:



It has a really nice CASIO LCD controller and subsystem but the video input controller and overlay board is garbage. Poorly soldered joints and it just looks like something you would get in a kit. Reflowing yielded nothing but I'm eyeing these caps.


Could these be the source of my problem?
Also, I didn't get to see what the panel was like if I fed it a video signal.

[tmwalsh]

Re: Pyramid 7" LCD - No stable picture

Is the last image a picture of the board at the bottom of the 1st picture flipped over and end-for-end? Doesn't really matter, but replacing the caps on that board would be a low cost experiment. The farthest to the left looks dodgy to me, with apparent 'white stuff' leaking out the bottom.
As they say "It couldn't hoit..."
tom

[Wizard]

Re: Pyramid 7" LCD - No stable picture

The LCD itself is a composite, focus your capacitors check on that. The purple cap is polymer.

Cheers, Wizard

[mbates14]

Re: Pyramid 7" LCD - No stable picture

i had a couple of LCD displays that were a different brand, but exact setup as yours, with the exact problem. turned out to be an issue with the panel itself and i never did fix it. so if you figure it out, give me a heads up.

Also, that panel setup isnt even an active matrix TFT, its a piss-poor low contrast passive PSTN display. and once working, the picture will look awful.

[pentium]

Re: Pyramid 7" LCD - No stable picture

So you say it's the LCD panel itself that is probably the problem and not the other components like the controller or overlay boards? Damn.

I don't need a super high resolution. I was going to mount it on my CCD-V5000 camera and use it as a monitor and substitute for the b/w viewfinder.

[kc8adu]

Re: Pyramid 7" LCD - No stable picture

had an icom ic-2800h in with that same washed out mess.
it was a dc-dc converter bad.it was supposed to supply -15v.it was at 0.

[Wizard]

Re: Pyramid 7" LCD - No stable picture

Exactly, that why need to check all the voltages. One might show wrong as well as bad caps.

Cheers, Wizard