Searching for a dual LVDS cable - Acer 5755/5750 - 30pin MB to 40pin LCD

Long story short. Acer 5755G-9417. Want to upgrade WXGA LCD to FHD. Bought panel. No cable.

I'm looking for a dual channel LVDS cable that will fit.
Searched high and low, even from different manufacturers. No cable to be found. I'm only 1 person lol.

Assuming most motherboard connector pinouts are standard... a dual LVDS cable would work.
OEM single LVDS cable missing some pins, so in theory FHD support is there. Panel displays FHD, but of course missing lines from missing cables.

Cable I'm looking for:
DUAL LVDS Motherboard 30 pin to LCD 40 pin.
(The webcam connector may not be the same but I'm sure I can swap the connectors)

This is a picture of the motherboard connector.

If ANYONE could help me find a matching cable and where to get it... that would be greatly appreciated.

SOLVED.
Motherboard 2nd channel lvds cut. Connector not standard. No way around it.

 

100 views and no one has any idea?

 

/summons triturbo and cdoublejj.

 

Indeed one of these 2 Acer experts should have some idea

 

Could try a reverse lookup; check fhd panel id by searching NBR and see which model laptops turn up.

Tricky bit will not be to find a cable that fits-fits (there's several to choose from), yet although a 30-pin/lvds pinout is standardised on the lcd end, the same is not true for the motherboard connector; pin #xyz may end up in different places on different motherboards. Would be helpful to have the schematics, since you could then mod the cable if so required, hard to come by though ...

Spoiler: lvds 1- and 2-channel 6-bit 30-pin terminator

There is one other thing to check ... just to be sure; there does exist a similar Aspire 5xxx non-eDP model that supports ≥900p, right? Otherwise there's no guarantee that the additional pins are 'live'. The lvds-out is a channel separate from the hdmi-out, so the gpu may very well support fhd, but that doesn't necessarily mean the internal lvds circuit does. That image doesn't look too promising; there's only ~17 pins accounted for on this side of the pcb, which would match with a single channel connection ... only way to be certain (without the diagrams) is with a multimeter. Kinda finicky though; very small pitch, so big chance to short (experience, ahem ... ).

 

If only more people bought notebooks with a decent screen from the get-go...

 

kay188, t456, best way to check the additional pins is to research motherboard schematics. E.g. 5930G had only 1280x800 LCD available, but motherboard was dual-LVDS thus supported up to 1920x1200.

kay188, you may find something of interest in this thread.

 

Thanks for the information. However, I'm not even sure where to start looking. I've been reading but still at a lost on how to even proceed.

I'm not sure if it means anything, but I did plug in the FHD panel and it does display 1920, but obviously the extra data lanes are missing.

Triturbo did state that the lanes are cut for the 57xx series laptop. But I still want to try for a cable to put my want for a higher res screen to rest.

PS. @alexhawker I didn't buy the laptop. Otherwise I would have chosen a better brand anyway.

 

kay188, as far as I understand, you have Compal LA-6901P motherboard. It does not have second LVDS channel, no way around it, schematics.

 

No dice if that is indeed the motherboard in question;

Spoiler: lvds connector

That's single-channel; 1x2 clock ("CLK") and 3x2 data ("OUT"), together that's one 6-bit channel. There was room to spare for a second, but in this instance they've used the pins to connect the webcam, rather than the usual method of a separate cable+connector.

Sans changing the mb, there's also an alternative solution; reroute data over hdmi using a hdmi -> lvds adapter (just an example; type needs to match specific panel id). These are commonly used to re-use a laptop lcd as an external monitor, but would work just as fine when embedded and used with a hdmi splitter there's no need to sacrifice the port.

Question is where you'd leave the board if there's no spare room inside the base ... perhaps on top of the display lid ... Would also need 12V to power it, but could splice the AC-cord into two and strap the 12V adapter atop the existing power brick.

 

Holy, thanks for the information guys. It's more information than all the previous threads about FHD upgrades on Acer's that I could find. You really can find everything on the internet these days.

The motherboard is the same, even for the highest trim. My trim is not far from it, so no dual lvds there.
The only solution would be the HDMI to LVDS adapter and I would tuck the whole board inside the OOD bay and tap 12v power from the DC jack... However I found something even smaller but I don't know where to get 5V,3A from for the LCD to make it flush.

HDMI to dualLVDS converter (FullHD)

---

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The connector on the MB is different. I failed to read through the whole schematic lol.

The question remains:
How come the service manual states it's using a SINGLE channel LVDS connection to a 2ch LVDS panel?
Which makes me want to believe 1600x900 is possible over single channel LVDS.

 

kay188, LA-6911P has dual-channel lvds, but it won't fit inside your notebook.

You'll save yourself a lot of hassle by selling the high-res panel, and/or the notebook as well if it doesn't meet your requirements. Sadly, there's nothing outstanding about 5755G to justify such efforts - it's non-replaceable low-end GPU destroys the whole idea, you can't mod into something glorious, performance-wise. Even if you make it work, the GPU will struggle in games due to increased resolution.

 

The 7738G was the last glorious stand of the Acer machines really.

 

@Starlight5 I'm not looking to fit the LA-6911P into my laptop, I hope my post above doesn't imply such.
I'm looking at it due to the fact the service manual states it's a single channel LVDS, but the schematics show live 2nd channel LVDS connection...
So I'm wondering if 1600x900 is really possible over single channel LVDS if Acer has done it with the 7750G's LA-6911P 30pin LVDS connector.

I'm also not gaming with the 5755G. Even in games, I would be playing them at the lowest setting at max res for optimal frame rate. I'm a desktop user and the laptop is only for out and about like a friends place.

 

Answer; the service manual's description is in error. The schematics clearly show the two channels:

Spoiler: dual channel, 6-bit lvds

Not sure the mini-adapter can handle the fhd panel; looks like it's intended for small displays and your 17.3"'s backlight needs ~7W power. Though ... if it works you could get away with powered USB; that can handle 5V at max. 2A, which would be within limits. No need for a separate adapter then.

Kinda pushing it, but 2.0-0.4A = 1.6A = 8W available for the panel ... it could be doable, depending on whether or not the panel you bought is power-hungry or not; look up the panel id in Panelook. Could also run brightness below max., if required. Cooling may be an issue, but a mini-fan would solve that.

It's a brilliant little board in any case, it even has 8-bit colour, so could power a 16.7M panel. These are the only two at 17.3" btw ... no laptop has them, seems intended for embedded (medical) hardware.

 

Thanks @t456. I had my hopes up high that Acer some how delivered WXGA++ over single channel.
Even then, (I failed to look at the LCD connector on the schematic lol) the connectors are completely different due to the fact Acer created their own 30pin connector instead of using the standard 40pin (which most laptops use).

That tiny board seems to be the only possible solution.
Oh, my screen is not a 17.3". I brought that up from the Acer 7750G series with dual lvds. My panel is 15.6".
The B156HW01 V4 specs say the the total power consumption is 11.5W, and the lamp uses 9W.

It's possible to tap into USB power, especially since I almost never run the panel at max brightness.
But one would need to tap into multiple USB ports across the board to provide the amperage because USB can only provide max 500mA, and the USB3 port can provide 900mA.
So total would be 1.9A if I tap into all 3 ports.
There is no way a laptop usb was designed as USB Power Delivery to deliver 2A.
To prevent damage, I wouldn't tap into USB power.

The only solution I would think were to just run the separate power out of the ODD bay and the heatsinks should be enough for cooling. But by then, the laptop would just be less portable and well, more of a desk replacement instead which defeats the purpose of being a laptop for my mobile usage.

 

So I came across another idea when researching back then.

The Acer V3 - 571G is the exact same chassis, I've watched disassembly guides and the MB are nearly identical in terms of placement.
I'm thinking, grab myself a high end V3 - 571G board and put it in for FHD goodness. (along with a new 30pin eDP panel)

However, the Q5WV1 LA-7912P board used inside, schematics show the LVDS 2nd channel may be cut? But the 40 pin connector is there.
ALSO, HYDE makes a custom cable that supports FHD, 40pin lvds connector to 30pin eDP display.

Can someone confirm my theory?

 

Weird little board:

Spoiler: combined lvds+edp connector

So yes; using the single lvds channel you're limited to 800p, yet the edp will support up to 1080p. This also shows the advantage edp has; it needs just 6 wires to accomplish fhd, whereas lvds requires 16 to do the same (disregarding voltage and ground).

Your setup would work, though that cable you need is not technically a " 40pin lvds connector to 30pin eDP display", since that implies there's a signal conversion taking place, which is impossible without a separate converter board. It really is just an eDP cable, only with a pinout that matches this strange connector.

Since this needs a new eDP display, cable and motherboard the cost:benefit ratio might land a bit on the other side of sane though ... .

 

Oh I see what you mean. Acer has designed the motherboard that standard 40pin lvds output WITH 1ch lvds + eDP output. No wonder it has the 2nd channel lvds cut.
And it's eDP cable connector on the LCD side into a 40pin LVDS (connector only) on the motherboard side.

I have the cable already. New eDP display, $100. Motherboard, $100 tops.
As for cost/benefit ratio, that's up to the end user to decide. So I'll have to see how much the motherboards go for.

It's a bit difficult to find the motherboard though due to the fact that there is no part number in the service manual. It's TBD. There's a bunch of them online already, but without the specs of each configuration, it's hard to know which specs I'm getting. Of course, one would want the best specs. Perhaps a year or so down the road the boards would surface more online.