LG NS9550F Service Manual

3-4
ONE POINT REPAIR GUIDE
2. NO BOOTING WHEN POWER ON THE SET
The set doesn’t work when press the power button on the front board or the remote
control.
2-1. MICOM (IC501)
2-1-1. Solution
Please check and replace IC501 on MAIN board.
2-1-2. How to troubleshoot (Countermeasure)
1) Check the 5.6 VA (CN106) and DVCC 3.3 V(IC505) in standby mode.
 If there is no 5.6 VA, check the SMPS and if doesn’t appear 3.3 V, check IC505.
2) Check 5.6 VA, +12 V, FL+, FL-, an +39 V when power on the set.
- If the set doesn’t work regardless of what the KEY2 changes high to low while pressing the power button.
X500 and X501 work normally but, if you can not power on the set, replace the IC501 with a new one on
the main board.
2-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
KEY1
(pin16)
X500
(24 MHz)
X501
(32.768 KHz)
PW R_CTRL
(R5F7)

LG NS9550F Specifications

General

Brand	LG
Model	NS9550F
Category	Stereo System
Language	English