LG CM2630B Hi-Fi system - power board circuit diagram, program download, troubleshooting

LG CM2630B (CM2630B, CMS2630FH) Micro Hi-Fi System – SMPS schematic, troubleshooting, program download

PROGRAM DOWNLOAD

AUDIO PROGRAM
Download program file name must be CM2630_YYMMDDX.HEX
If security program (Water Wall) is activated on PC, you must save the file to the USB storage device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.

CD PROGRAM
Download program file name must be HF000_CM2630_YYMMDDX.bin
If security program (Water Wall) is activated on PC, you must save the file to the USB storage device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.

TOUCH PROGRAM

Download program file name must be TC380_LG_CM2630_YYMMDDX.DLD
If security program (Water Wall) is activated on PC, you must save the file to the USB storage device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.

EQ PROGRAM
Download program file name must be EQ_PRG.BIN
If security program (Water Wall) is activated on PC, you must save the file to the USB storage device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.

LG CM2630B SMPS schematic

DC-DC converter

LG CM2630B Power amplifier schematic

NO POWER PROBLEM
No power problem occurs when you power on the unit.
Solution
Replace X100, IC101, IC103.
How to troubleshoot (Countermeasure)
1) Check X100 (Crystal).
Ö If it does not oscillate, change X100.
2) Check IC103 (Reset IC).
Ö If its output voltage is not more than +2.7 V, change IC103.
3) Check IC101 (Micom).
Ö After power is on if the pin8 of IC101 is not ‘High’, change IC101.
But, the new μ-com IC need to write program.

SPEAKER NO AUDIO OUTPUT

No audio output problem occurs when you power on the unit.
Solution
Replace IC700.
How to troubleshoot (Countermeasure)
1) Check IC700 Pin1(VCC_12 V) for driving the gate of IC700 (AMP IC).
a. If +12 V is low, there is possible for AMP IC to be damaged.
b. Remove bead among L700, L703.
When removed bead, if +12 V is recovered, the IC connected to it was damaged.
c. Replace the IC with a new one.
2) Check the impedance between AMP PWM output & GND.
a. If the impedance is about 0 Ω, the IC must be damaged.
b. Replace it with a new one (AMP IC).

USB NO OUTPUT
When USB insert, USB no detect on the unit.
Solution
Replace IC902.
How to troubleshoot (Countermeasure)
1) Please check Harness connection between Main(CN103) and Top(CN370) BD.
2) If it is OK, please check two ICs below.
3) Please check IC902 of Main BD.
Ö Pin2 : 12 V, L907 : 5.6 V
4) Please check IC362 of TOP BD.
Ö Pin2 : 5.6 V, Pin3 : 5 V
5) If it is not OK, replace IC902 or IC362.

NO BOOTING
After you turn on the unit and displayed message in the following order (HELLO > VOL XX > CD or USB...etc) on LCD, it will not display other message on LCD, and it will not boot-up normally.
Solution
Replace X500.
How to troubleshoot (Countermeasure)
1) Please check the soldering status of 12 MHz crystal (X500).
2) Please check the frequency of 12 MHz crystal (X500).
3) If the crystal doesn’t oscillate, replace X500.
4) After changing it, if the set is still not booting, replace MAIN board assembly.