Smart TV Mainboard ZLS47HIS-V1 with Cannot Startup Problem Solved
Today come with a Changhong ZLS47HIS-V1 Smart TV mainboard and complaint problem is cannot startup but the power LED light was lit. This Smart TV mainboard using the MSD6A818 as a MainChip and this mainboard use the 12V + 24V as supply voltage, also with NOR Flash + EMMC flash memory chip. Since this is an overstocked TV Mainboard, so found some of the capacitors is missing on the mainboard.
Supply voltage to the TV mainboard and it is confirm the board cannot start-up. Connect with the RT809H Universal Programmer, check their Print-Log status with SecureCRT software as photo below:
The above Print-Log message shows that the TV mainboard problem is in the EMMC or their corresponding circuit component/s. So check the basic condition of how TV Mainboard working (please refer to V6-Smart OLED/LED/LCD TV Repair Tips ebook for more details). Also start checking the TV Mainboard from the easy way first then to the difficult. So start to check the EMMC and their corresponding circuit components.
First, check their EMMC voltage supply line 3.3V. This 3.3V voltage supply line is go to two way, one is through FB4 to EMMC chip; another way goes through the 10K ohm resistors to EMMC chip each I/O pins. Found the R1048 (10K ohm) resistor was open circuit. After replaced R1048, power on the TV mainboard and connected with RT809H programmer. This time the Print-Log status shows it is go to the Console unit now (maybe the previous repairer was erased/empty their EMMC chip firmware before). So find the correct version firmware and copy it into the USB thumb drive try to upgrade their firmware. But the Mainboard cannot recognize the USB thumb drive firmware. Normally, when the TV Mainboard can reach the Console unit but cannot upgrade, there were several factors may cause this problem. For example, the USB thumb drive is not compatible with Mainboard, USB circuit in TV mainboard, the BootLoader firmware is not match with Mainboard, Mainchip problem & etc. Tried to change another USB thumb drive and the TV Mainboard can upgrade their firmware now!
After upgraded the TV Mainboard firmware, the TV Mainboard can start-up and loading till the TV Logo shows, but then no display! Removed the EMMC chip from the TV mainboard and to do the offline read the chip and found nothing wrong on it. That’s mean the EMMC chip is okay. So suspect the problem is on the EMMC corresponding circuit component/s. Continue to check the EMMC circuit components (Actually this EMMC circuit line just have several components only), and found their VDDi pin corresponding component C1000 (SMD 2.2uF/10v) is missing. Put a good smd 2.2uF/10V capacitor to C1000 and this Smart TV Mainboard is working now!
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