TM150
ADJUSTMENTS, PERFORMANCE CHECK, AND FIRMWARE UPGRADE
2 – 35
CONFIDENTIAL
DRAFT
10. BACK LIGHT DOES NOT TURN ON.
FS701 is mounted improperly, or the fuse is brown.
Is VBAT voltage applied to C701?
Is fuse (FS701) in good appearance, mounted properly, and is
there conduction?
C701, C703, and L701 are defective.
External dis-
play only.
Which back light does not turn on, Main or External?
Main Display only or both.
Is back light setting for External Display set to On?
Go to the setting as follows and set it to On:
Settings Phone
Settings Main
Display
Back light
Does it turn on?
Not defective.
Is CN705 in good appearance and mounted properly?
CN705 is defectiv e.
Back light FPC or CN705 is defective.
Is the contact point of back light FPC clean?
Is back light FPC properly inserted to CN705?
Clean back light FPC and insert it again. Does it turn on?
Not defective.
Is 13 - 24 V applied between TP710 and TP711?
Back light FPC is defective.
Are C790, C791, C702, C707, C713, R718, and D702 in good
appearance and mounted properly?
C790, C791, C702, C707, C713, R718, and D702 are defec-
tive.
R453, R437, and IC404 are defective.
Is back light setting for Sub Display set to On?
Go to the setting as follows and set it to On:
Settings
Phone
Settings External
Display
Back light
Does it turn on?
Not defective.
Is 7 V applied between LED703 anode (A) terminal and
LED704 cathode (K) terminal?
IC707 is defective or mounted improperly.
LED703 and LED704 are defective.
NO
NO
YES
YES
NO
YES
NO
YES
NO
YES
NO
NO
YES
YES
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
C
C
Summary of Contents for TM150
Page 61: ...TM150 CIRCUIT DIAGRAM AND PWB LAYOUT 5 13 CONFIDENTIAL DRAFT MAIN PWB_FRONT ...
Page 62: ...TM150 CIRCUIT DIAGRAM AND PWB LAYOUT 5 14 CONFIDENTIAL DRAFT MAIN PWB_REAR ...
Page 63: ...TM150 CIRCUIT DIAGRAM AND PWB LAYOUT 5 15 CONFIDENTIAL DRAFT LCD PWB_FRONT ...
Page 64: ...TM150 CIRCUIT DIAGRAM AND PWB LAYOUT 5 16 CONFIDENTIAL DRAFT LCD PWB_REAR ...