3-4
ONE POINT REPAIR GUIDE
3. NO BOOTING WHEN POWER ON THE SET
The set doesn’t work when press the power button on the FRONT_CTRL board or the remote control.
3-1. IC501
3-1-1. Solution
Replace IC501 on MAIN board.
3-1-2. How to troubleshoot (Countermeasure)
1) Check the 5.6 VA (CN106) and DVCC_3.3 V (IC505) in standby mode.
If there is no 5.6 VA, check the SMPS and if doesn’t appear 3.3 V, check IC505.
2) Check 5.6 VA, +12 V, FL+, FL-, an +39 V when power on the set.
If the set doesn’t work regardless of what the KEY2 changes high to low
while pressing the power button. X500 and X501 work normally but, if you can not power on the set,
replace the IC501 with a new one on the MAIN board.
3-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
< MAIN board bottom view >
X500
X500
(24 MHz)
(24 MHz)
X501
X501
(32.768 kHz)
(32.768 kHz)
KEY2
KEY2
(R526)
(R526)
R522
R522
PWR_CTRL
PWR_CTRL
Summary of Contents for CM9750
Page 15: ...2 2 ...
Page 19: ...4 SPEAKER SECTION A60L A60R ...
Page 75: ...3 71 3 72 PRINTED CIRCUIT BOARD DIAGRAMS 1 SMPS P C BOARD TOP VIEW ...
Page 77: ...3 75 3 76 2 MAIN P C BOARD TOP VIEW ...
Page 78: ...3 77 3 78 MAIN P C BOARD BOTTOM VIEW ...
Page 79: ...3 79 3 80 3 FRONT P C BOARD TOP VIEW ...
Page 80: ...3 81 3 82 FRONT P C BOARD BOTTOM VIEW ...
Page 81: ...3 83 3 84 4 FRONT_CTRL P C BOARD TOP VIEW BOTTOM VIEW ...