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49
Output power is unstable
Unstable power
Check sampling
Circuit
Check R827,
R829, R830,
repair R827, R829,
R830 R833
Check the R pin
voltage of IC804
Check R826, R828
Check D813 ,C823 if
short
Change D813 C823
Check pin2
of IC806
Check pin5 of
IC806 voltage
below 1.4V
Check R845, R846,
R849, R852,R853,
END
Check the C
pin voltage of
IC804 if 3V
Change
IC803
Summary of Contents for M2700HD
Page 23: ...BenQ M2700HD Service Manual 22 13 Assemble the hinge cover ...
Page 28: ...BenQ M2700HD Service Manual 27 14 Remove the panel ...
Page 29: ...28 5 Circuit Board and Standard Parts Replacement 5 1 Block diagram Power Board ...
Page 30: ...29 ...
Page 31: ...30 ...
Page 32: ...31 ...
Page 33: ...32 IF Board ...
Page 34: ...33 ...
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Page 42: ...41 ...
Page 43: ...42 Keypad ...
Page 44: ...43 IF board layout Keypad board layout PI board layout ...