LG MCD23 - Vkk Check; Micom Part Check I

3-2
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
2. P-SENS 3. VKK PART CHECK
4. MICOM PART CHECK I
NO
Check power circuit
Troubleshooting.
YES
P-SENS
Check
the PIN6 of CN1
if DC V is over
5.6V
YES
OK
OK OK
NO
Check power circuit
Troubleshooting.
YES
VKK CHECK
Check
the PIN3 o CN1
if DC V is over
-28V.
YES
OK
NO
NO NO
Replace IC101
(KIA7042)
Check if IC101 of output
voltage is over4.3V
YES
YES
YES YES
YES
Check voltage of
IC100(LC87Fxxx)PIN4
YES
Refer to SMPS
troubleshooting.
MICOM PART
HECK I
Check P-SENS
(P7904_PIN6)
NO
Check both
End voltage of IC101
(KIA7042)
Check
If input voltage of
IC101 is over 5V
Check the
Periphery of IC101
(KIA7042)