LG HX806CM BLU-RAY HOME CINEMA SYSTEM TROUBLESHOOTING – RESET – CIRCUIT DIAGRAM

LG HX806CM Blu-ray HOME CINEMA SYSTEM Troubleshooting – Reset – Circuit Diagram

SMPS & POWER AMPLIFIER SCHEMATIC – SA RESET – TROUBLESHOOTING – LG  HX806CM Blu-ray Disc HOME CINEMA SYSTEM

TROUBLESHOOTING

When you turn on your set, it will display “PLEASE WAIT” on front panel, and it will not boot-up normally.  Two possibilities.

[1] IC501 (MPEG IC).

Replace IC501 on MAIN board.

How to troubleshoot (Countermeasure)
1) Please Check 1.15 V / 1.5 V / 3.3 V.  Check RESET_8550 (at the point of C586).
2) If it doesn’t work even though 1.15 V / 1.5 V / 3.3 V power and RESET_8550 are no problem, IC501 MT8555D could have problem.
3) If RESET_8550 isn’t high (3.3 V), you may need to replace IC101.
4) After changing it, if the set is still no booting, check MAIN board.

 [2] MAIN Board

Replace MAIN board.

How to troubleshoot (Countermeasure)
1) Please remove IC501 and IC601 ~ IC603, and then check the Impedance between each signal (DATA, ADDRESS, and so on.)
2) If there is some Impedance (a few ohm or infinite ohm) especially power source Trace, PCB via might be broken. You’d better change MAIN board.

When you connect AccuWeahter, You-tube or Picasa through the wired LAN, the “no connection” message appears.

JK801 (ETHERNET JACK)

Replace JK801 on MAIN board.

How to troubleshoot (Countermeasure)
1) Check you internet connection. Make sure it connect properly to modem or router.
2) If internet connection OK, please check the Ethernet Jack (JK801).
3) If there is soldering problem, please re-soldering pin JK801.
4) If after re-soldering problem still occurs, replace JK801.
5) If problem still occurs after change JK801. check MT8555D IC (IC501).

BAD HDMI VIDEO / AUDIO OUTPUT
When unit is connected to HDMI TV using HDMI cable, picture shows bad color, no output or mixed color on the screen. But component output is OK.

JK802 (HDMI JACK)

Replace JK802 (HDMI Jack).

How to troubleshoot (Countermeasure)
1) Check JK802 pin soldering.
2) If there is short soldering on pin JK802, re-soldering pin JK802.
3) If problem still occurs, check HDMI data on RN801 and RN802 :
> If all data OK, Replace JK802.
> If data NG, Replace IC501.

NO SPEAKER OUTPUT
When unit is connected to Speaker using speaker cable, no speaker output.

AMP BOARD

Replace AMP board.

 How to troubleshoot (Countermeasure)
1) Check Voltage at ACN602.
> If 30 V,12 V voltage doesn’t come out, re-soldering in ACN602.
2) Check Voltage at ACN601 pin12, 13.
> if 3.3 V voltage doesn’t come out, check IC303 in MAIN PCB.
3) Check the AMP_SD signal of pin16 at ACN601.
> If this pin is low, replace AIC701 or AIC702 or AIC703.
4) If problem still occurs, change AMP board.

HOW TO USE THE SA RESET FUNCTION

In order to insert the new SA adjustment values, it need clearing SA initial values of the flash memory.

REQUIRED SA RESET
* After changing Traverse.
* After changing Main Board Assembly.
* After changing Main Board Flash IC.

SA RESET PROCEDURE

Power on the set (then, mode is in home menu ).

Press Setup.

Under DISPLAY highlighted condition, press ‘5’ ->
‘1’ > ‘7’ > ‘7’ > ‘7’ > ‘7’ > ‘7’ on the remote controller to display special mode. Move to the SA / IOP Reset and click.

Insert BD-ROM SL Disc. (Tray is opened automatically.)

If the disc is inserted, you will see “Wait”.

If SA Adjustment is finished, tray is opened automatically.

Press stop key twice to escape this special mode.

"ALL BD DISC" READING ERROR
> All the Blu-ray disc is not operated, but DVD and CD are operated normally.
> If the LDO for APC of BD laser diode is abnormal, BD doesn't work.
> If the LD current control is abnormal, BD doesn't work.

Component
1) MD (Traverse Assembly)
2) IC701 – Adjustable LDOHow to troubleshoot (Countermeasure)
1) Check MD (Traverse, pick-up) first of all.
2) Check input / output voltage of LDO IC701 – (12 V, 9 V)
3) If output voltage is abnormal, check the periphery of IC701 and replace it.
4) Check the BD LD Control input / output.  If input signal (VRDC3O) is OK, but no output (BD_LD), check the TR Q702, Q706.

"ALL DVD DISC" READING ERROR
* All the DVD disc is not operated, but BD and CD are operated normally.
* If the LD current control is abnormal, DVD doesn't work.

Component
1) MD (Traverse Assembly)
2) Q701, Q704
How to troubleshoot (Countermeasure)
1) Check MD (Traverse, pick-up) first of all.
2) Check the DVD LD control input / output. If input signal (VRDC2O) is OK, but no output (DVD_LD), check the TR Q701, Q704.

"ALL CD DISC" READING ERROR
- All the CD disc is not operated, but BD and DVD are operated normally.
- If the LD current control is abnormal, CD doesn't work.

Component
1) MD (Traverse Assembly)
2) Q703, Q705
How to troubleshoot (Countermeasure)
1) Check MD (Traverse, pick-up) first of all.
2) Check the CD LD control input / output.  If input signal (VDACO) is OK, but no output (CD_LD), check the TR Q703, Q705.

POWER AMPLIFIER SCHEMATIC

SMPS SCHEMATIC

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