Steam Deck Mainboard Testing Points
Type
Device(s)
Steam Deck
Difficulty
Testing Points of the Steam Deck Mainboard are shown in Figure 1. Values are shown in Table 1. Testing points are divided by sectors ("Position"). Measurements were done with a VC99 (Aliexpress clone) Multimeter. Measurements in diode mode were done with the positive terminal of the multimeter connected to ground of the mainboard (housing of the battery connector) and the probe was connected to the COM terminal of the multimeter. Resistance measurements were done in regular configuration.
Figure 1 (imagemap)
Table 1: Testing points on the Steam Deck Mainboard (LCD, revision G, front). GND : connected to ground (0 Ohms/0 Volts), OL: Open Line (no resistance/voltage measurable).
Type
#
Side
Position
Diode Mode [V]
Resistance to Ground [Ohms]
Testing Point
01
Front
F1
0.277
3300
Testing Point
02
Front
F1
0.06
90.9
Testing Point
01
Front
F2
0.06
90.9
Testing Point
02
Front
F2
GND
GND
Testing Point
01
Front
F3
OL
OL
Testing Point
02
Front
F3
0.66
100000
Testing Point
03
Front
F3
0.65
100000
Testing Point
04
Front
F3
OL
OL
Testing Point
05
Front
F3
0.65
100000
Testing Point
01
Front
F4
0.55
277000
Testing Point
02
Front
F4
0.392
21000
Testing Point
03
Front
F4
0.422
80000
Testing Point
04
Front
F4
0.692
39000
Testing Point
05
Front
F4
0.545
23000
Testing Point
06
Front
F4
0.742
17000
Testing Point
07
Front
F4
GND
GND
Testing Point
08
Front
F4
GND
GND
Testing Point
01
Front
E1
0.585
OL
Testing Point
02
Front
E1
0.5
2588
Testing Point
03
Front
E1
0.85
158600
Testing Point
04
Front
E1
0.73
24500000
Testing Point
05
Front
E1
0.85
24500000
Testing Point
06
Front
E1
0.85
658000
Testing Point
07
Front
E1
0.82
9380
Testing Point
08
Front
E1
0.345
529
Testing Point
09
Front
E1
GND
GND
Testing Point
10
Front
E1
0.277
3300
Testing Point
11
Front
E1
0.477
6430
Testing Point
01
Front
D1
GND
GND
Testing Point
02
Front
D1
0.48
9520
Testing Point
03
Front
D1
GND
GND
Testing Point
04
Front
D1
0.48
64500
Testing Point
05
Front
D1
0.365
1221
Testing Point
06
Front
D1
0.48
19980
Testing Point
07
Front
D1
0.38
1188
Testing Point
08
Front
D1
0.827
71000
Testing Point
09
Front
D1
0.363
1222
Testing Point
10
Front
D1
0.48
19700
Testing Point
11
Front
D1
0.477
19800
Testing Point
12
Front
D1
0.38
1190
Testing Point
13
Front
D1
0.755
978000
Testing Point
14
Front
D1
0.8
5800000
Testing Point
15
Front
D1
0.8
2300000
Testing Point
16
Front
D1
0.755
10000000
Testing Point
17
Front
D1
0.466
2060
Testing Point
18
Front
D1
0.48
24000
Testing Point
19
Front
D1
GND
GND
Testing Point
20
Front
D1
0.48
24000
Testing Point
21
Front
D1
0.545
10900
Testing Point
22
Front
D1
0.454
22000
Testing Point
23
Front
D1
0.728
69000
Testing Point
24
Front
D1
0.847
29200
Testing Point
01
Front
D2
0.847
29480
Testing Point
01
Front
D3
0.033
17
Testing Point
02
Front
D3
0.033
19.6
Testing Point
03
Front
D3
0.461
2655
Testing Point
04
Front
D3
0.458
2637
Testing Point
05
Front
D3
0.053
24
Testing Point
01
Front
D4
0.458
2614
Testing Point
02
Front
D4
0.118
358
Testing Point
01
Front
C1
0.428
22700
Testing Point
02
Front
C1
0.428
23000
Testing Point
03
Front
C1
0.428
30000
Testing Point
04
Front
C1
0.6
OL
Testing Point
05
Front
C1
0.545
623000
Testing Point
06
Front
C1
0.425
5836
Testing Point
07
Front
C1
0.6
3700000
Testing Point
08
Front
C1
GND
GND
Testing Point
09
Front
C1
0.55
10990
Testing Point
10
Front
C1
GND
GND
Testing Point
01
Front
C2
0.031
15.4
Testing Point
02
Front
C2
0.848
29460
Testing Point
03
Front
C2
0.56
19000
Testing Point
04
Front
C2
0.474
14610
Testing Point
05
Front
C2
0.56
19730
Testing Point
06
Front
C2
0.474
14780
Testing Point
07
Front
C2
0.442
400000
Testing Point
08
Front
C2
0.474
14780
Testing Point
09
Front
C2
GND
GND
Testing Point
10
Front
C2
0.052
24.7
Testing Point
11
Front
C2
GND
GND
Testing Point
12
Front
C2
0.55
12350
Testing Point
01
Front
C3
0.03
17.6
Testing Point
02
Front
C3
0.03
17.4
Testing Point
03
Front
C3
0.052
24.9
Testing Point
04
Front
C3
0.651
10000000
Testing Point
05
Front
C3
0.01
0.7
Testing Point
06
Front
C3
0.647
20000000
Testing Point
01
Front
C4
GND
GND
Testing Point
02
Front
C4
0.378
11300
Testing Point
03
Front
C4
0.378
11240
Testing Point
04
Front
C4
GND
GND
Testing Point
05
Front
C4
0.118
347.3
Testing Point
01
Front
B1
0.735
83000
Testing Point
02
Front
B1
0.395
20000
Testing Point
01
Front
B2
GND
GND
Testing Point
02
Front
B2
0.595
1172
Testing Point
03
Front
B2
0.382
10930
Testing Point
04
Front
B2
0.24
1600
Testing Point
05
Front
B2
0.585
62000
Testing Point
06
Front
B2
0.585
62000
Testing Point
07
Front
B2
0.512
200000
Testing Point
08
Front
B2
0.389
9120
Testing Point
09
Front
B2
0.832
22350
Testing Point
10
Front
B2
0.832
22350
Testing Point
11
Front
B2
0.475
19820
Testing Point
12
Front
B2
0.277
3350
Testing Point
01
Front
B3
0.392
20000
Testing Point
02
Front
B3
0.63
32000
Testing Point
03
Front
B3
GND
GND
Testing Point
01
Front
B4
0.647
OL
Testing Point
02
Front
B4
0.422
82000
Testing Point
03
Front
B4
GND
GND
Testing Point
04
Front
B4
0.548
278000
Testing Point
05
Front
B4
GND
GND
Testing Point
06
Front
B4
0.6
730000
Testing Point
07
Front
B4
0.362
200000
Testing Point
08
Front
B4
0.6
12000000
Testing Point
09
Front
B4
0.43
105500
Testing Point
01
Front
A1
GND
GND
Testing Point
02
Front
A1
0.54
11800
Testing Point
03
Front
A1
0.4
20420
Testing Point
04
Front
A1
0.4
20370
Testing Point
05
Front
A1
0.424
5800
Testing Point
01
Front
A2
GND
GND
Testing Point
02
Front
A2
0.528
970000
Testing Point
03
Front
A2
0.548
OL
Testing Point
04
Front
A2
0.765
19600
Testing Point
05
Front
A2
0.564
29200
Testing Point
06
Front
A2
0.392
14280
Testing Point
07
Front
A2
0.535
15300
Testing Point
01
Front
A3
GND
GND
Testing Point
02
Front
A3
0.645
OL
Testing Point
01
Front
A4
0.422
82000
Testing Point
02
Front
A4
GND
GND
Testing Point
03
Front
A4
GND
GND
Testing Point
04
Front
A4
0.416
16000
Testing Point
05
Front
A4
0.516
3000000
Testing Point
06
Front
A4
0.42
82000
Testing Point
07
Front
A4
0.39
16250