维修状态的进入与退出：
1、打开电视机电源开关。
2、使用用户遥控器，依次按用户遥控器“丽音”（红色）键，“屏显”（黄色）键及数字键“9、0、9、0”直到屏幕右上角显示绿色“M”字样，即进入维修状态。
3、调整完毕，按交流关机或按遥控器待机键关机，即可退出维修状态。或可使用与进入维修状态的相同操作退出维修状态
附：海信TF2900DP（H98C机心）数据与参数对照
| 显示符号 | 调整内容 | 数据 | |
| SUB CONTRAST | 副对比度 | 20 | |
| SBU BRIGHT | 副亮度 | 40 | |
| SUB COLOR | 副色度 | 20 | |
| SUB TINT | 副色调 | 15 | |
| SUB SHARPNESS | 副锐度 | 10 | |
| Y SUB CONTRAST | 亮度信号副对比度 | 20 | |
| RGB-CONTRAST | 模拟RGB对比度（画中画） | 05 | |
| PN KILLER | 消色灵敏度控制 | 00 | |
| B MONITOR | 蓝色输出监视 | 00 | |
| R MONITOR | 红色输出监视 | 00 | |
| Y-DL SW P/N | 亮度延迟 | 00 | |
| Y-DL SW SECAM | 亮度延迟 | 00 | |
| BLUE BACK MODE | 蓝背景模式 | 00 | |
| PEAK ACL SW | 峰值自动色度限制 | 00 | |
| WHITE PEAK LIMIT SW | 白峰限制 | 01 | |
| Y | 亮度信号 | 00 | |
| G DRIVE GAIN | 绿驱动增益 | 101 | |
| B DRIVE GAIN | 蓝驱动增益 | 101 | |
| H OUT CLOCK SW | 行输出时钟切换 | 00 | |
| AFC MODE TV | 自动频率控制电视模式 | 01 | |
| AFC MODE EXT | 自动频率控制 | 01 | |
| HORIZONTAL POS 50 | 50Hz行中心 | 04 | |
| HORIZONTAL POS 60 | 60Hz行中心 | 09 | |
| R CUT OFF | 红截止 | 79 | |
| G CUT OFF | 绿截止 | 80 | |
| B CUT OFF | 蓝截止 | 85 | |
| WIDE PICTURE-MUTE | 图象消隐开关 | 01 | |
| WIDE V-BLK SW | 场消隐宽度 | 00 | |
| COLOR LIMIT SW | 色度限制切换 | 01 | |
| PN GP | P/N开关门位置设置 | 00 | |
| C-TOF PAL NTSC | P/N彩色选通 | 01 | |
| C-TOF SECAM | S制彩色选通 | 00 | |
| OFST-SW | 00 | ||
| BLACK STRETCH OFF | 黑电平延伸关 | 00 | |
| F-BW | 迫使黑白切换 | 00 | |
| SECAM-INHIBIT | 00 | ||
| B-Y BLACK OFFSET | 蓝色差黑偏移 | 09 | |
| R-Y BLACK OFFSET | 红色差黑偏移 | 09 | |
| TOF FO TV | 00 | ||
| TOF FO EXT | 00 | ||
| TOF Q TV | 00 | ||
| TOF Q EXT | 00 | ||
| PN CD ATT | P/N色差幅度调整 | 01 | |
| COLOR LIMIT LEVEL | 色度限制电平 | 00 | |
| CHROMA TRAP FO | 03 | ||
| CHROMA TRAP Q | 00 | ||
| VSM GAIN | 00 | ||
| VSM PHASE | 01 | ||
| APA-CON PEAK FO | 02 | ||
| DC TRAIN RATE | 直接补偿程度 | 00 | |
| BLACK STRETCH POINT | 黑电平延伸始点 | 00 | |
| HALF TONE SW | 半调谐增益选择 | 00 | |
| ABL GAIN | 自动亮度控制增益 | 00 | |
| ABL POINT | 自动亮度控制点 | 00 | |
| V OUT PHASE 50 | 50Hz场中心 | 06 | |
| V OUT PHASE 60 | 60Hz场中心 | 02 | |
| V FREQUENCY | 场频 | 00 | |
| H BLK PHASE 50 | 50Hz行消隐相位 | 06 | |
| H BLK PHASE 60 | 60Hz行消隐相位 | 00 | |
| IBIT | 全平为1，超平为0 | 00 | |
| V-AMPLITUDE 50 | 场幅 | 05 | |
| V-AMPLITUDE 60 | 07 | ||
| COINCIDENT | 02 | ||
| V-CENTERING | 00 | ||
| DRG SW | 00 | ||
| VS-CORRECTION | 00 | ||
| V AGC-SP | 01 | ||
| DRV CNT | 00 | ||
| V CD MD TV | 00 | ||
| V CD MD EXT | 00 | ||
| V CD MD TEXT | 00 | ||
| V LINEARITY | 场线性 | 30 | |
| WIDE V-BLK START | 63 | ||
| WIDE V-BLK STOP | 00 | ||
| WIDE P-MUTE START | 60 | ||
| WIDE P-MUTE STOP | 03 | ||
| MUTE MODE | 00 | ||
| BLK SW | 00 | ||
| NOISE DET LEVEL | 00 | ||
| N COMP | 00 | ||
| BELL FO | 01 | ||
| SECAM KILLER | 00 | ||
| V-ID SW | 00 | ||
| S GP | 00 | ||
| DEMP FO | 00 | ||
| SCD STT SECAM | 色差幅度调整 | 00 | |
| S-FIELD | 00 | ||
| PICTURE HEIGHT | 场幅 | 31 | |
| PICTURE WIDTH | 行幅 | 19 | |
| E-W PARABOLA | 枕校 | 25 | |
| TRAPEZIUM | 桶形失真 | 16 | |
| V LINEARITY | 场线性 | 18 | |
| VS-CORRECTION | 场S校正 | 06 | |
| V-COMPENSATION | 场补偿 | 06 | |
| E-W CORNER | 东西角校正 | 06 | |
| H-COMPENSATION | 行补偿 | 03 | |
| V-CORRECTION | 场校正 | 10 | |
| OSD | 字符位置 | 14 | |
| AV3 | VIDEO输入口设定为3个 | AV3 | |
| P200 | POS设定为200个频道 | P200 | |
| USE重低音 | 使用重低音设置 | USE | |
| USE图文 | 连接图文模块 | USE | |
| USE画中画 | 连接画中画模块 | USE | |
| N-NICAM | 不使用丽音 | N | |
| ALPS | 使用阿尔卑斯调谐器 | ALPS | |
| USE9090 | 使用Y/C分离集成电路 | USE | |
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