Electrical Troubleshooting Guide - Zenith XBR411 Manual

ELECTRICAL TROUBLESHOOTING GUIDE

Reset or Power Check.
Check it after connecting the power cable
only for NO Reset or Power ON.
Are the pin 4, 1 of CN202
+12V, +5V respectively after the power
cable connecting?
YES
Does the pin 3
of IC202 change 0V to 3.3V
at the power supply initial
input mode?
YES
Are the X201, X300 oscillating?
YES
<Power>
•Is the pin 5 of IC312 3.3V?
•Is the pin 4 of IC312 1.5V?
•Is the pin 3 of IC306 2.5V?
YES
<Reference>
•1V(IREF):Check pin 116 of IC201
•1.65V(REFIN):Check pin 142 of IC201
•1.65V(REFOUT):Check pin 136 of IC201
•2.1V(REFI2):Check pin 12 of IC106
•2.3V(REF01):Check pin 13 of IC106
•2.3V(FPDVREF):Check pin 25 of IC106
•3.3V(REFI):Check pin 38 of IC106
•1.65V(REF02):Check pin 39 of IC106
YES
OK
RL-02A LOADER PART
NO
NO
NO
NO
3-98
•Check the power(5V,12V)short.
•Check the power cable.
•Repair the power part.
•Check the IC312(3.3V reg.IC).
•Check the HRST signal of IC201, IC301
•Check the X201,X301
•Check the oscillation IC202,IC302
•Check the IC312, IC306