akira 21RBS3 Series User manual

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Model No: 21RBS3Ve_21RBS3Wn
Version 1.0
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CHASSIS: TB1238
MODEL:
21RBS3Ve
21RBS3Wn

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Model No: 21RBS3Ve_21RBS3Wn
Version 1.0
CONTENT
TB 1238 SERIES I2C BUS CONTROL INSTRUCTION ....................................................................... 4
TYPICAL FAILURE ANALYSE............................................................................................................ 6
VARIOUS PARAMETERS OF INTEGRATED CIRCUIT.................................................................. 20
CIRCUIT DIAGRAM ............................................................................................................................ 22
EXPLODED VIEW................................................................................................................................ 23

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Model No: 21RBS3Ve_21RBS3Wn
Version 1.0
TB 1238 SERIES I2C BUS CONTROL INSTRUSTION
3. The way go into the factory mode
Step 1. Press the numeric keys, switch to the position 12
Step 2. Press the numeric keys again, switch to the position 38
Step 3. Press the MENU key to call up the POS.LOCK menu
Step4. Press the MUTE key
Step5. Press the numeric key to input the password 1, 2, 3, 8. Then the TV will enter into the
factory mode while the "M" displayed on the top of the screen.
4. Under adjusting mode, you can select the item you want by pressing the “ ” keys and you
can adjust the value of the items when you press the “ ” keys.
5. If the adjusting is default, please restore the data as previous or adjust according the table as
follows.
No Item Value Meaning No Item Value Meaning
1 RCUT 20* Red cut-off 35 VP 60 01 60Hz vertical center
2 GCUT 38* Green cut-off 36 HITS FD 50Hz/60Hz vertical size
3 BCUT 44* Blue cut-off 37 VLIN 0A Vertical linearity
4 GDRV 40* Green drive 38 VSC 06 Vertical S correction
5 BDRV 40* Blue drive 39 VLIS FF 50Hz/60Hz vertical linearity
6 CNTX 3F Contrast maximum 40 DPC 00 50Hz pillow distortion correction
7 BRTC 30 Brighter center 41 DPCS 00 50/60Hz pillow distortion
correction
8 COLC 50 Color center 42 KEY 00 50Hz keystone distortion
9 TNTC 40 Tint center 43 KEYS 00 50/60Hz keystone distortion
10 COLP 10 Color center of PAL 44 WID 00 50Hz horizontal size
11 COLS 40 Color center of
SECAM
45 WIDS 00 50/60Hz horizontal size
12 SCNT 0F Sub-contrast 46 VCP 00 Vertical compensation
13 CNTC 20 Sub-contrast center 47 CNR 00 Coner correction
14 CNTN 08 Sub-contrast minimum 48 HCP 00 Horizontal compensation
15 BRTX 20 Sub-bright maximum 49 SBY 08 SECAM B-Y
16 BRTN 20 Sub-bright minimum 50 SRY 08 SECAM R-Y
17 COLX 7F Sub-color maximum 51 RAGC 16 R.F. AGC
18 COLN 00 Sub-color minimum 52 AFT 40* Auto frequency tune
19 TNTX 35 Sub-tint maximum 53 HAFC 00 AFC Gain
20 TNTN 28 Sub-tint minimum 54 V25 55 25 percent Volume
21 ST 3 3F TV-3.58 sharpness 55 V50 6F 50 percent Volume
22 SV 3 3F AV-3.58 sharpness 56 BRTS 00 Sub-bright
23 ST 4 20 TV-4.43 sharpness 57 VM 2 30 (CTS-763A)
24 SV 4 3F AV-4.43 sharpness 58 MOD0 21 Mode 0
06 For 14 and 21 inches Mode 125 SHPX 30 Sharpness maximum 59 MOD1
17 For 25 and 29 inches Mode 2
26 SHPN 1A Sharpness minimum 60 MOD2 0C Mode 2
27 TXCX 36 OSD contrast
maximum
61 SELF
VCO
7G* Self-diagnosis VCO

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Model No: 21RBS3Ve_21RBS3Wn
Version 1.0
No Item Value Meaning No Item Value Meaning
28 RGCN 16 OSD contrast
minimum
62 SELF
AGC
69* Self-diagnosis AGC
29 VMO 7C VCD data 0 63 SELF
BRTC
75* Self-diagnosis bright center
30 VM 1 00 VCD data 1 64 SELF
CNTC
00* Self-diagnosis contrast center
31 HPOS 0B Horizontal position 65 SELF
TNTC
32* Self-diagnosis tint center
32 VP 50 04 50 Hz vertical center 66 SELF
COL
23* Self-diagnosis color center
33 HIT 19 50 Hz vertical size 67 OSD 00 OSD width adjustment
34 HPS 02 50/60Hz horizontal
center
68 OPT 27 Option
69 MOD3 07 Language 70 ZOOM
IN HIT
3F Zoom in height
71 ZOOM
OUT
HIT
0b Zoom out height
Note:
1. The items with * in value are very special, do not adjust them at random. The items(1-5) are
used to debug white-black-balance of set.
2. The general secret code is 2175.
3. If you find the threadlike disturbance on the top of picture, please adjust the VM 2 in the items
and make its value come to 34.
4. When E PROM does not work, please exchange the same model chip with data that the
manufacture has already input. 2