IBM Thinkpad R32: after start-up, the LCD showed nothing, but the power light and hard disk indicator light were still normal. External monitor showed normally. So the doubt was that the LCD data cable were damaged, replace a new LCD data cable, the failure still existed.
Change the LCD, it’s gone. This kind of failure is probable of LCD damages. If it can’t be ensured, replace it with a new one to check if it is good.