LG LH-T7652SB, LHS-76SBC, LHS-76SBS, LHS-76SBW DVD-CD RECEIVER How to enter the service mode, Schematic diagram, Exploded view

 

Stereo mode 100W + 100W (Rated Output Power 100W, 4Ω at 1 kHz, THD 10 %)
Surround mode Front: 100W + 100W (Rated Output Power 100W, THD 10 %).  Centre: 100W
Surround: 100W + 100W
(Rated Output Power 100W, 4Ω at 1 kHz, THD 10 %)
Subwoofer: 200W (Rated Output Power 150W, 3Ω at 30 Hz, THD 10 %)

Be sure no power is applied to the chassis or circuit, and observe all other safety precautions

* NTSC model doesn’t have VCR option and use DVD option B~F as VCR option. (only DVD exist)
* PAL model has another separate VCR option. (Both VCR and DVD exist)

1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board.
3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and adjustment screws should absolutely never be touched.
4) Laser beams may damage the eyes.
 Never permit laser beams to enter the eyes.
 NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

NEVER look directly at the laser beam, and don’t let contact fingers or other exposed skin.

Cleaning the lens surface
If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort this.  Never attempt to disassemble the pick-up spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.
(Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.

Service mode entry for EEPROM

SMPS Schematic

Main board schematic

Cabinet and mainframe Exploded View