Read LG 50PA450T-ZF / 50PA451T-ZA (CHASSIS:PD21B) Service Manual online
STEP3. Setting like below and push “Start DQS”. (Red box)
STEP4. below picture is test result. Red box is timing margin.
※Normal operating board has timing margin 7~9. If timing margin under 7 ,it’s some problem DDR or Main MIU.
6. Memory margin test. (DDR)
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