Service manual

VE-CG30U
VE-CG40U
21
LCD PWB troubleshooting
Image is not displayed on LCD normally.
No
Is backlight lit? Is 12V applied to TL1801?
Yes
Is voltage of 12V and 3.3V applied to TL1807 and TL1806, respectively?
No
Backlight of LCD unit is defective.
Yes
No
Is RGB signal sent to TL1815, TL1816 and TL1817?
Is CSYNC signal sent to TL1813?
Refer to "Power circuit troubleshooting".
Check FFC between MAIN PWB and LCD PWB.
No
No
Check peripheral circuit of L1802.
Check IC1801 27PIN to 32PIN.
Check SC801 on MAIN PWB and its peripheral circuit.
Check FFC between MAIN PWB and LCD PWB.
Check FFC between MAIN PWB
and LCD PWB.
Check IC8901 on MAIN PWB and its
peripheral circuit.
Yes
Yes
Yes
Is LCD-RGB signal sent to TL1836, TL1837 and TL1838?
Yes
LCD unit is defective. Replace
No
Sound playback system troubleshooting, when audio signal is not sent from line out (CG40 only)
Insert SD card recording sound into the set, and play back file in playback mode.
No
Is 3.3V applied to both ends of L1602, L1603 and L1605?
Is 5V applied to both ends of L1604?
Refer to "Power circuit troubleshooting".
Yes
No
Check peripheral circuit of IC1604 and FL1601.
Yes
No
Are IC1602 13PIN and 14PIN set to "H"?
Is 4.096MHz sent to R1637?
Check IC702 48PIN and 49PIN and its peripheral circuit.
Yes
Is pulse sent to IC1602 9PIN?
No
Yes
No
Is audio signal sent to IC1603 15PIN?
Check peripheral circuit of IC1602 15PIN.
Check peripheral circuit of IC1603 15PIN.
Yes
No
Is audio signal sent to IC1603 13PIN?
Check peripheral circuit of IC1603 13PIN and 14PIN.
IC1603 1PIN: "H" at audio output
Yes
No
Is audio signal sent from IC1603 12PIN?
Check peripheral circuit of IC1603 12PIN.
IC1603 1PIN: "H" at audio output
Yes
Is audio signal sent to TL4406 on JACK PWB?
Check periphery of IC1602 and peripheral circuit of IC204.
Yes
Video/Audio cable is defective.
No
Check FFC between JACK PWB and MAIN PWB.
Check peripheral circuit of J4403.