Loewe 67501 D 00, Service Manual

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67501 T/D 00
2 – 4
No audio signal output from the main PWB
Is audio signal input into terminal of each connector?
1) 2ch analog audio connection
Pins (12) (MAIN_L) and (14) (MAIN_R) of SC5602
2) 5.1ch audio connection
i) Audio for front L and R channels
Pins (4) (AUD_L) and (6) (AUD_R) of CN5602
ii) Audio for surround L and R channels
Pins (1) (AUD_SL) and (2) (AUD_SR) of CN5602
iii) Audio for subwoofer channel
Pin (10) (AUD_SW) of CN5602
iv) Audio for center channel
Pin (8) (AUD_CTR) of CN5602
Is any digital signal input into pins (1) - (4) of the IC which
does not output audio?
Is there output from DAC?
1) 2ch analog audio connection
Check pins (9) and (10) of IC5606.
2) 5.1 ch audio connection
Check pins (9) and (10) of IC5601, IC5603 and IC5605 respectively.
Is 5V supplied to pin (13) and -8V to pin (11) of IC5601, IC5603,
IC5605 and IC5606 respectively?
Replace the IC.
NO
YES
YES
Is any digital signal detected at each resistor of R8117,
R8137, R8105, R8149 and R8106?
Check the line between each resistor and IC5601, IC5603, IC5605,
IC5606.
NO
Check the peripheral circuits of IC8104.
NO
Check the peripheral circuits of SC5602.
YES
Check IC5602 and its peripheral circuits.
NO
NO
YES
FLOW CHART No.4
No video and audio signal output from HDMI terminal.
Replace the TV set (cable) and reconfirm.
Still no video and audio output?
Defective TV set or cable. Or, check the contact of soldered cable
of SC4201.
NO
Are power supply voltages of IC4202 as 1.8V, 3.3V and 5V
OK?
Check the peripheral circuits of IC4201 and IC4203.
Or replace the corresponding IC.
YES
YES
NO
Is pin 25 (reset) at High level? Is R4219 not short-circuited? Is the constant wrong?
Or check the peripheral circuits of IC4501.
YES
NO
Is a wave pattern detected at pins (2) and (3) of IC4202? Is
the data line functioning (Hi/Low)?
Replace IC8104.
Or rewrite the main software.
YES
Replace IC4202.
Or check the peripheral circuits of IC4202.
NO
Is pin (51) of IC4202 higher than 2V? Is the level of pin (5) of IC4203 at least 5V?
YES
YES
NO
NO
FLOW CHART No.5