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LC-37AD5E
D-TUNER UNIT:
Is digital signal fed from pins (20) and (21) of TU201 (TUNER) to
pins (11) and (10) of IC202 (COFDM)?
Is data FED[0:7] sent from pins (3), (4), (5), (6), (8), (9), (10) and
(11) of P202?
DIGITAL UNIT:
Are video signals (R/G/B, CVBS) sent from C4639/C4640/C4641/
C4625?
Are video signals (R/G/B, CVBS) send from the C4636/C4637/
C4638 and emitters of Q4607?
MAIN UNIT:
Is video signal (CVBS) sent from pin (2) of IC2705 (SW).
Are video signals (R/G/B, CVBS) fed from pins (179), (180), (181)
and (184) of IC3002?
Are scrambled images not displayed?
Refer to "No video output in all modes".
DIGITAL UNIT:
Is audio signal fed to pins (5) (L-ch) and (10) (R-ch) of IC4604
(OP-AMP)?
Is audio signal sent from pins (7) and (8) of IC4604 (OP-AMP)?
MAIN UNIT:
Is audio signal sent to pins (11) and (4) of IC2704 (SW)?
Is AIN1L audio signal sent to pins (10) of IC3002?
Is AIN1R audio signal sent to pins (9) of IC3002?
Refer to "No sound output in all modes".
No video output during DTV reception. Colour of Images are not right.
YES
YES
YES
YES
YES
YES
NO
No audio output during DTV reception. Sound is low.
YES
YES
YES
YES
NO
Check TU201 and its peripheral circuits and if I2C is accessed
between TU201 and IC202.
NO
Check between IC202 and P202.
NO
Check R4011 (AC8pin), R4013 (AC9pin) and IC4001 (D-Proces-
sor).
NO
Check Q4601-Q4607 and their peripheral circuits.
NO
Check IC2705 and its peripheral circuits.
NO
Check peripheral circuits of IC3002.
YES
DIGITAL UNIT:
Check 5V output of pin (1), (2), (5) and (6) of IC4702.
Check 5V of pin (6) of Q4401.
NO
Check R4002 (AD2pin) and IC4001 (D-Processor).
NO
Check power supply of IC4604 (OP-AMP) and its peripheral cir-
cuits.
NO
Check the line between IC4604 and IC2704.
NO
Check output of pins (13) and (3) of IC2704 and peripheral cir-
cuits.
4 – 8
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