昨天收到一块邮寄过来的先科电视机三合一板，板号为TP.R69 PD64
故障描述有两个问题：
有时红灯亮不开机，有时开机正常进去系统后图像画面正常接入AV、HDMI信号输入没有图像信号显示
冷机偶尔能开机进入系统，断电在开机就红灯亮不开机，测得电压各路DC正常，压降正常，拿出我们的神器RT809H编程器连接好VGA串口线，选择好第一个线序查看主板工作状态的打印信息。
不开机打印信息如下：
Hello world!{m3a} svn-r(Mar 16 2015 15:57:38)
init_hwsetting_c
pre_hwsetting_c
post_hwsetting_c
parse hw setting DONE!
internal rom
force emmc
Normal boot
check boot media...
mmc_init...
emmc:read sys info
read sys info fail
看到这，心里哇凉哇凉的，先前测过供电正常，还是避免不了啊，这个型号主芯片相信不少同行师傅都记忆深刻。没错它就是（RTD2969DB）虽然不想面对，但还是拆开散热片吧，果然是它...只能含泪更换了
更换后通电试机正常打印如下：
2020-3-25, 15:21:53
COM8, BaudRate:115200 bps, RXD: VGA->12,TXD: VGA->15, Printed by RT809H:
J
Hello world!{m3a} svn-r(Mar 16 2015 15:57:38)
init_hwsetting_c
pre_hwsetting_c
post_hwsetting_c
parse hw setting DONE!
internal rom
force emmc
Normal boot
check boot media...
mmc_init...
emmc:read sys info
mmc_read_sysinfo . read sys info@emmc OK
HW: 0x00000ba0
AC: 0x00003de0
UB: 0x0004f2f0
EXT : 0x00002100
[1;32m ext fw RSA signature verify OK![0m
emmc:read uboot
[1;32m bootcode RSA signature verify OK![0m
GO
U-Boot 2012.07-TCL_ODM_Rtd2969_20150706/trunk/Rtd2969_ALI_QingJi/bootcode-svn682 (Nov 18 2015 - 17:50:17)
RTC: Init...Running
SCPU: BISR testing ....
SCPU: Finish BISR testing (OK)
CPU : Cortex-A17
[krsv] use default uboot memory:
bank[0] Start = 0x0, Size = 0x20000000
DRAM: 512 MiB
Watchdog: Enabled
IO Config 2= PIN_WIFI_CTR@0000000100014603
IO Config 2= PIN_BL_ON_OFF@0000000001010804
IO Config 2= PIN_BL_ADJ@00ffff9600800108
IO Config 2= PIN_LVDS_ON_OFF@0000000000010004
IO Config 2= PIN_KEYPAD_MENU@0000000a3f000601
IO Config 2= PIN_KEYPAD_SOURCE@0000000a1e000601
IO Config 2= PIN_KEYPAD_RIGHT@0000000a00000701
IO Config 2= PIN_KEYPAD_LEFT@0000000a1e000701
IO Config 2= PIN_KEYPAD_UP@0000000a3f000701
IO Config 2= PIN_KEYPAD_DOWN@0000000a5c000601
IO Config 2= PIN_KEYPAD_PWR@0000000a00000601
IO Config 2= PIN_HDMI1_HOTPLUG@0000000001010404
IO Config 2= PIN_HDMI2_HOTPLUG@0000000001010504
IO Config 2= PIN_HDMI3_HOTPLUG@0000000000000000
IO Config 2= PIN_FLASH_WP@0000000000014703
IO Config 2= PIN_HDMI_MHL_SELECT@0000000100012804
IO Config 2= PIN_MHL_CABLE_DETECT@0000000000000904
IO Config 2= PIN_HP_OUT_JD@0000000000004b03
IO Config 2= PIN_AMP_MUTE@0000000100010c04
IO Config 2= PIN_POWER_DETECT@0000000000002504
IO Config 2= PIN_POWER_EN@0000000100010b04
IO Config 2= PIN_LED_G@0000000100010604
IO Config 2= PIN_LED_R@0000000101010704
IO Config 2= PIN_LVDS_SEL@0000000000014303
IO Config 2= PIN_HDMI1_DETECT@0000000000004503
IO Config 2= PIN_HDMI2_DETECT@0000000000004403
Board: TCL tv030 Board
POWER ON: AC
Cache: Ena
正常开机进入系统画面，接入HDMI信号测试一切正常OK维修结束，下面是正常视频：
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