Pin-outs For LCD panels.

Today I got a Compaq All in one PC (Model Number CPT-013-AIO), which came with a broken LCD panel. So I have to swap it with another screen, although it is a 30-pin LVDS connector I’ve noticed that it is not same as other LVDS cables. So it got me digging some data sheets.

Lot of the panels I have seen caries 8-bit dual channel 30 pin LVDS connection and most common pin-out for the connection goes like the following.

Pin #	Discription
1	LVDS Signal - Odd Channel 0 - Negetive
2	LVDS Signal - Odd Channel 0 - Positive
3	LVDS Signal - Odd Channel 1 - Negetive
4	LVDS Signal - Odd Channel 1 - Positive
5	LVDS Signal - Odd Channel 2 - Negetive
6	LVDS Signal - Odd Channel 2 - Positive
7	Ground
8	LVDS Clock Signal- Odd Channel - Negetive
9	LVDS Clock Signal- Odd Channel - Positive
10	LVDS Signal - Odd Channel 3 - Negetive
11	LVDS Signal - Odd Channel 1 - Positive
12	LVDS Signal - Even Channel 0 - Negetive
13	LVDS Signal - Even Channel 0 - Positive
14	Ground
15	LVDS Signal - Even Channel 1 - Negetive
16	LVDS Signal - Even Channel 1 - Positive
17	Ground
18	LVDS Signal - Even Channel 2 - Negetive
19	LVDS Signal - Even Channel 2 - Positive
20	LVDS Clock Signal- Even Channel - Negetive
21	LVDS Clock Signal- Even Channel - Positive
22	LVDS Signal - Even Channel 3 - Negetive
23	LVDS Signal - Even Channel 3 - Positive
24	Ground
25	NC
26	NC
27	NC
28	VCC-Typicaly 5V
29	VCC-Typicaly 5V
30	VCC-Typicaly 5V

When it is dual channel like the above, odd channel carries the data for odd pixels and even channel caries the data for even pixels. But some panels carry all the data on single channel. For E.g. the panel model M185XW01. For this particular LCD Panel the pin-out is as follows

Pin #	Discription	Pin #	Discription
1	NC	16	Ground
2	NC	17	LVDS Clock Signal - Negetive
3	NC	18	LVDS Clock Signal - Positive
4	Ground	19	Ground
5	LVDS Signal 0 - Negetive	20	NC
6	LVDS Signal 0 - Positive	21	NC
7	Ground	22	NC
8	LVDS Signal 1 - Negetive	23	Ground
9	LVDS Signal 1 - Positive	24	Ground
10	Ground	25	Ground
11	LVDS Signal 2 - Negetive	26	VCC +5v
12	LVDS Signal 2 - Positive	27	VCC +5v
13	Ground	28	VCC +5v
14	LVDS Signal 3 - Negetive	29	VCC +5v
15	LVDS Signal 3 - Positive	30	VCC +5v

If the panel is 6-bit that means you lose one LVDS Signal path per channel. As an example panel, model LP156WH2 have single channel 6-bit connection and 40 pin connector and pin-outs goes like this

Pin #	Discription	Pin #	Discription
1	NC	21	NC
2	VCC 3.3V	22	GND
3	VCC 3.3V	23	NC
4	3.3v For DDC	24	NC
5	NC	25	GND
6	DDC Clock	26	NC
7	DDC Data	27	NC
8	LVDS Signal 0 -	28	GND
9	LVDS Signal 0 +	29	NC
10	GND	30	NC
11	LVDS Signal 1 -	31	LED GND
12	LVDS Signal 1 +	32	LED GND
13	GND	33	LED GND
14	LVDS Signal 2 -	34	NC
15	LVDS Signal 2 +	35	LED PWM
16	GND	36	LED ON/OFF
17	LVDS Clock Signal -	37	NC
18	LVDS Clock Signal +	38	LED POWER 7V-20V
19	GND	39	LED POWER 7V-20V
20	NC	40	LED POWER 7V-20V