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RCA 55AN3D Service Manual page 18

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The resistance of 2.5V
output on the main board
8
PANEL 12V输出端
The resistance of 12V –
panel output on the main
board
4.4.3 Bootloader 程序烧录办法
烧录方法请参照 5.0.0。
4.4.3 Bootloader programming method
Please refer to appendix 5.0.0
4.4.4 EMMC 程序无法升级的可能原因及解决办法
a)、供电电压不正常:根据 4.4.2 测试各点电压,确保电压符合要求。
b)、检查 24MHz 晶振 Z501 是否起振:若异常请检查周边元件是否
c)、检查 N506 位(W25Q16)是否已烧入正确的 Bootloader 程序。
d)、检查 USB 接口供电是否正常。
4.4.4 The possible reasons of EMMC program can not upgrade and solution
a) .Checking supply power work or not, according to 4.4.2 test every point, make sure the
voltage is right.
b) .Check whether the crystal oscillator Z501 (24M) works or not, and the oscillation
frequency is normal or not.
c). Check whether the N506 (W25Q16) program bootloader software correct or not.
d). Check whether the USB supply power correct or not .
4.4.5 Silicon Tuner 部分
一:Silicon Tuner 部分电路由 N110,Z110 等元件组成,
上电前检查 N110,C885,C104 是否对地短路,如果有,请检查相关
焊接是否正常,如果没有,进行下一步上电检查,
4.4.5 Silicon Tuner part
Silicon Tuner part consist of some components such as N110, Z110. Check whether the
N110 , C885, C104 have weak welds or short circuits before power on. if not ,go on Power on
inspection .otherwise check related part.
上电检查:
1)用万用表测试以下节点电压是否满足下表要求:
C829
12V
焊接异常。
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