Acer B223PWL Service Manual page 54

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6.6 Troubleshooting.
S1. Can't Entry ISP Mode!!
(1) Check the cables and ISP JIG are connected fluently.
(2) Click the "Dis Con" and click "Connect" again.
(3) AC off the monitor for a while and retry it.
(4) Change other vervion ISP program.
(4)Change ISP JIG or cable.
(5)Change PC.