本帖最后由 cjt 于 2021-10-16 08:09 编辑
型号: LED55T60U(板号:35021065),主芯片为RTD2995D。 故障现象: 用户描述为有时不开机,放置一段时间后,偶尔能正常开机观看,后来越来越严重,一致不能开机。 初步检查: 通电打开主开关,背光灯亮,按待机键不能关机,等会儿背光灯不亮了,此时按待机键不能二次开机,也就是待机键不起作用。 检测主板电压,不受控的3.3V(N804)电压正常,在背光亮时,受控的1.2V(L801)、1.5V(L807)、2.5V(N807)、3.3V(L818)电压都正常,背光灭时全部消失。接上打印串口XS511,电脑联不上机,无法读取打印信息,初步判断EMMC数据损坏, 网友给的备份整片写入还是灰屏,用U盘升级原样,这到底是哪的问题? 打印信息: OM4, BaudRate:115200 bps, RXD: VGA->15,TXD: VGA->12, Printed by RT809H:
R U-Boot 2012.07-svn815094 (Mar 31 2015 - 16:54:34) GPU : BISR testing... GPU : Finish BISR testing (OK) SCPU: BISR testing .... SCPU: Finish BISR testing (OK) CPU : Cortex-A9 dual core Media: eMMC BP0 MISC : set FUSE_RDY DRAM: 1 GiB Watchdog: Enabled Board: Tv035 2995D 512M_512M Board POWER ON: AC Cache: Enabled Non-Cache Region: 1 MB@0x07900000 MMC: emmc:mmc_initial(1) Mar 31 2015 16:54:58 RTD299x eMMC: 0 MMC: set bus width 8 fail, try other mode Device: RTD299x eMMC Manufacturer ID: 11 OEM: 100 Name: 004GE Tran Speed: 52000000 Rd Block Len: 512 MMC version 4.0 High Capacity: Yes Capacity: 3.7 GiB Bus Width: 4-bit Extern param: MMC blk:0x7c (to 0x9000) rtk_eMMC_read blk_addr=0x0000007c, data_size=0x00000800, buffer=0x00009000 Factory: MMC rtk_eMMC_read blk_addr=0x0000c000, data_size=0x00000200, buffer=0x07880008 rtk_eMMC_read blk_addr=0x0000c742, data_size=0x00000400, buffer=0x07880210 rtk_eMMC_read blk_addr=0x0000e000, data_size=0x00000200, buffer=0x07880008 rtk_eMMC_read blk_addr=0x0000e742, data_size=0x00000400, buffer=0x07880210 rtk_eMMC_read blk_addr=0x0000c000, data_size=0x000e8400, buffer=0x07000000 Factory: seq:0x289, blk:0xc000(pp:0), size:0xe8400 (to 0x7000000) get_bootparam: ------------tmp/factory/bin_panel/000BootParam.h found BOOT_POWER_ON_MODE=1 BOOT_BACKLIGHT_VALUE=253 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_UART_OPEN_CLOSE=0 BOOT_MUSIC_VOL_VALUE=29 BOOT_LOGO_LED_MODE=1 bootparam.bUart = 0
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