LG LHB976, Руководство по обслуживанию

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2-83
When you turn on your set, it will blank / no message or “PLEASE WAIT” display on front panel,
and it will not boot-up.
1-3-3. IC150 (NO 1.2 V)
1-3-3-1.
Solution
Replace IC150 on MAIN board.
1-3-3-2. How to troubleshoot (Countermeasure)
1) Please check 1.2 V of C1C8 on MAIN board.
2) If 1.2 V voltage doesn’t come out, check IC150 pin2 (Vcc 14 VA).
3) If V input pin2 of IC150 is not 14 V.
First, check CN150 and if there’s no defective component, please check SMPS board.
Second, If 14 VA input is normal, first of all check the 1.2 V_CTRL is high(IC101 pin60).
4) After fixing it, if the set is still not booting:
Check L151, R1A3, C1C7, R1A1 and finally check IC150 or replace.
5) After fixing it, if the set is still not booting:
- Refer to the next page for checking another power source. (3.3 V, 1.5 V)
- Check Crystal X500 refer to item 1-3-5.
- Check NAND flash IC (IC506) refer to item 1-3-6.
- Check DDR IC (IC502, IC503) refer to item 1-3-7.
- Check BCM7633 IC (IC500) refer to item 1-3-8.
1-3-3-3. Service hint (Any picture / Remark)
< MAIN board top view >
MAIN SET ONE POINT REPAIR GUIDE
IC150
L151
C1C8