3-10
Copyright © 2020 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
ONE POINT REPAIR GUIDE
NO SOUND
2-3. HDMI
2-3-1. Solution
Replace MAIN board.
2-3-2. How to troubleshoot (Countermeasure)
1) Please check soldering status of HDMI jack and check HDMI_5V at IC303 pin6.
2)
If soldering status or HDMI_5V are abnormal, at first retouch them, then is not good, replace MAIN board.
2-3-3. Service hint (Any picture / Remark)
< MAIN board top view >
R3A1 100K
NC
HDMI_CTL
C374
10uF
C372
100nF
5.1VA
FB310
DGND
C373
10uF
R3A2
470
R366
4.7K
C375
100nF
HDMI_5V
DGND
3.3V_STB
IC303
1
IN
2
GND
3
EN 4
OCB
5
ISET
6
OUT
FB309
R301
4.7K
NC
DGND
[5.1VA to HDMI_5V]
V_IN : 2.5 ~ 5.5 [V]
I_LIM [A] = 230[V]/R_SET[ohm] = 230/R3A2
R3A1 : 10K ~ 100K [ohm]
I_LIM : 0.2 ~ 2 [A]
IC303
To Next Page
Loading...
