It’s not the trouble of RAM alone. Therefore, it is guessed that the circuit which is not operating by RAMBIST or RAM direct access mode but operating in normal time (Normal address signal selecting circuit).It is considered that, by the delay of the circuit, the address switching has been delayed, it resulted the difference of the display and wrong writing.Moreover, it was confirmed that the failure condition became worse by higher frequency of writing cycle (refer to page 5). Hence, it is judged that the wiring resistance of the signal line is higher than normal (high-impedance failure on the signal line).