A22M/A22P Display Issue

[Dana]

My A22M (2628-TTU) developed a problem where I would get some video corruption at the cursor position followed by a hard system lockup. On the heels of this I would get video corruption while booting, or a black screen, and occasionally only beeps. ( a long beep, two short beeps) Apparently this indicates a problem with the system board, DIMMs, or LCD assembly. I should add this also happened with an external monitor. I removed DIMMS without a change in behavior. Same behavior when using an external monitor.

Decided it was probably a system board problem and found a replacement board on eBay. Upon receiving the board it turned out to be a system board for an A22P (2629-UTU).

I swapped out the old board. System boots just fine with the replacement board. No lockups. But now there is a two inch vertical black band on the right side of the display. Running Windows 2000. The desktop is squished into the remainder of the display so it is compressed horizontally and elongated vertically with probably and inch or two of the desktop invisible off the bottom of the screen.

I updated to newest bios and newest video drivers. No change.
I removed the video sub card that came on the replacement system board and replaced it with the sub card from the old system board.
No change in the display.

Everything is fine using an external monitor.

Where does that leave me?

This particular display problem did not exist with the old system board. Would an improperly seated video cable cause such a symptom?

I confess inserting the video cable into the connector on the sub card left me unsure if it was seated properly even though I have done it three times now. Not the same positive feedback that I get from installing a DIMM for instance. But the little metal plate on near the end of the cable is in the proper position for the screws to fit and be tightened.

Looks as if it is time to disassemble the LCD and check connections inside. Seems I might as well do this before trying to reseat the video cable yet again.

Does it sound as if I am on the right track?

Could there be a board level problem that is causing this display behavior?

I really did not want to take the LCD apart but can't think of anything else.

Dana

[Dana]

OK, no bites on this.

What are the possible, or most likely causes for the lcd display not displaying two inches vertically on the right side of the display? It just appears this portion of the display is not being addressed.

LCD controller is bad (I assume on the system board)?

Bad connection between LCD cable and sub card?

Loose connection inside the display?

Is there persistent hardware info on the system board, in this case the system expecting a 15 inch display when the it isf a 14.1 inch display?

[aaron158]

do u know if the a22p board ur using has the 8 or 16 mb ati rage card

[Dana]

The A22P board, model 2629-UTU has 16Mb of video and it is being detected by the OS. I believe it is Rage Mobility 128.

[aaron158]

thats ur problem then. see the a22m uses a xga 15 inch lcd where the a22p uses a uxga 15 inch lcd. really there are only two ways to fix it one is to replace the screen with an uxga screen or get the right motherboard the one with the 8 mb ati card. thats also why it works find on an external display.

if u want to get another motherboard let me know i might have one.

[Dana]

I understand the two system boards were matched to different resolution displays. I wasn't completely surprised when the 3261 video sub card exhibited the display problem. I thought maybe I would get lucky with the 3306 video sub card from the old system board.

You didn't state explicitly, are we agreeing that the LCD controller on the system board is where the problem lies? I've been assuming the LCD controller is not on the video sub card.

Dana