先科电视主板坏了不开机看师傅是如何修复的

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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

拆下来

更换后

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

 ext fw RSA signature verify OK!

emmc:read uboot

 bootcode RSA signature verify OK!

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：