LG BH4120SN, Руководство по обслуживанию

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ONE POINT REPAIR GUIDE
2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR
“PLEASE WAIT” ON FRONT PANEL
When you turn on your set, it will blank / no message or “PLEASE WAIT” display on front panel, and
it will not boot-up.
2-4. IC150 (NO 1.5 V)
2-4-1. Solution
Replace IC150 on MAIN board.
2-4-2. How to troubleshoot (Countermeasure)
1) Please check 1.5 V of CA511 on MAIN board.
2) If 1.2 V voltage doesn’t come out, check IC150 pin13 (VCC 14 VA).
3) If VIN (pin13) of IC150 is not 14 VA.
First, check CN150 and if there’s no defective component, please check SMPS board.
4) After fixing it, if the set is still not booting :
Check L1EO 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, 1.2 V)
- Check Crystal X501 refer to item 2-5.
- Check NAND Flash IC (IC504) refer to item 2-6.
- Check DDR IC (IC502, IC503) refer to item 2-7.
- Check MT8560 IC (IC501) refer to item 2-8.
2-4-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC150
L1E0
CA511