LG L1718S-BN Service Manual - Page 17
Check, feedback, circuit, Check Vpin1-2 of, IC801 about 1V, Q801 below 0.3V, Check Pin R of, IC803, - 17
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UPC - 719192182073
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Page 17 highlights
3. DC output voltage is unstable Output Voltage Unstable Check Vbe of Q801 below 0.3V Check circuit if short Check reference voltage Check Q801, Q802 Check Pin R of IC803 voltage about 2.5V Check R810, R811 Check feedback circuit END Check Vpin3-4 of IC801 about 6V Check Vpin1-2 of IC801 about 1V Check R809, R814 Check ZD801, ZD802, ZD803, D803, D805 Check R809, R814, IC801, R818 Check C815, D806, R812 17
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3.
DC output voltage is unstable
Check R810, R811
Check
feedback
circuit
Check Vpin3-4 of
IC801 about 6V
Check Vpin1-2 of
IC801 about 1V
Check
C815,
D806, R812
Check R809,
R814
END
Output Voltage Unstable
Check
Vbe
of
Q801 below 0.3V
Check circuit if
short
Check
ZD801,
ZD802,
ZD803,
D803, D805
Check Q801, Q802
Check reference
voltage
Check Pin R of
IC803
voltage
about 2.5V
Check R809,
R814, IC801,
R818