创维8R96主板不开机维修一例
接修一块创维的8R96的板,板号:5800-A8R960-0P00,主芯片型号:RTD2992。
据描述故障现象为开机花屏,然后黑屏。之后不开机,隔几天后可能会再开机。 通电试机的确花屏,竖带雪花条,由于故障出现的时间较快没拍到图,之后再试一直开不了机,测各路供电正常,ddr供电1.52v跟基准电压0.76v正常,测各路供电回路压降没发现问题,接上打印如图: 打印只显示这么点,是什么意思呢?在RTD方案这个底层打印的意思是主芯片向emmc存储读取不到BootLoader引导程序,拆开散热片看见主芯片上的胶都变色了说明工作的时候温度很高的。 怀疑虚焊于是刷上焊油用风枪吹进去然后放在bga返修台上加热焊接完成,冷却后试机打印如下: U-Boot 2012.07-svn572608 (Sep 10 2013 - 17:43:35) GPU : BISR testing... GPU : Finish BISR testing (OK) SCPU: BISR testing .... SCPU: Finish BISR testing CPU : Cortex-A9 dual core Media: eMMC BP0 DRAM: 1 GiB Watchdog: Enabled init_amp_prepare Board: Tv010 v2 1G Board POWER ON: AC Cache: Enabled Non-Cache Region: 1 MB@0x07900000 MMC: emmc:mmc_initial(1) Sep 10 2013 17:43:47 RTD299x eMMC: 0 Device: RTD299x eMMC Manufacturer ID: 11 OEM: 100 Name: 004G9 Tran Speed: 52000000 Rd Block Len: 512 MMC version 4.0 High Capacity: Yes Capacity: 3.7 GiB Bus Width: 8-bit Extern param: MMC blk:0x7c (to 0x9000) Factory: MMC Factory: seq:0x9c, blk:0xe000(pp:1), size:0x1bce00 (to 0x7000000) get_bootparam: ------------tmp/factory/bin_panel/000BootParam.h found BOOT_POWER_ON_MODE=1 BOOT_LOGO_ENABLE=1 CUSTOM_VIDEO1_LENG=0 CUSTOM_VIDEO2_LENG=0 BOOT_MUSIC_ENABLE=0 CUSTOM_AUDIO1_LENG=0 CUSTOM_AUDIO2_LENG=0 LOCAL_UPGRADE_EN=0 boot_power_on_mode=1 get_layout: ------------tmp/factory/layout.txt found BOOTPART=0 TAG=21 init_amp Factory_RO: MMC [FAC_RO] No factory_ro data in eMMC [1;34mee read 368, 6[m name=EEP_I2C ppcb_enum.Name=EEP_I2C, ppcb_enum.info=4 EEP_I2C=4 name=EEP_DEVICE_ADDR ppcb_enum.Name=EEP_DEVICE_ADDR, ppcb_enum.info=50 name=PIN_EEP_WP ppcb_enum.Name=PIN_EEP_WP, ppcb_enum.info=100011304 m_PIN_EEP_WP = 0x100011304 a. Eeprom_Read-macaddr is 1ca7703ebae6 [1;31m set_mac_cmd is 1c:a7:70:3e:ba:e6 [m Panel: Use parameters in tmp/factory/bin_panel/panel.bin Panel: sky_sdl420 panel_init_1st $$$$$$$$ This is Local Dimming Panel !!! Panel: ulFreq:149000000, nDPLL:157499520, Mcode:35, Ncode:3, offset:6e9 DispI : Finish BISR testing done DispD : Finish BISR testing done In: serial Out: serial Err: serial Net: rtl8139: REALTEK RTL8139 @0xb8016000 Hit Esc or Tab key to enter console mode or rescue linux: 0 ------------can't find tmp/factory/recovery ======== Checking into android recovery ==== boot_ac_on=1 (Re)start USB... USB0: #@# usb3_phy_setting(108) +++ 20130415 #@# usb3_phy_setting(209) --- #@# usb2_phy_s 由于篇幅有限所以只截取了一部分的打印信息,开机图像如下 冷却跟长时间试机均正常,至此修复完成。 第一期学员已毕业,第二期名额已满,学员们已在来的路上,第三期已报名4位,只剩2个名额,请感兴趣的同学尽快报名锁定学位,先到先得! 报名联系方式 国内 电话:020-28667686(潘老师) 微信:RDDZ2017 国外 电话:020-28667686(Sally) 微信:songli19921013 网络课程 碎片时间 随时随地 轻松学习
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