Strong SRT4155Evolution, Руководство по обслуживанию

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4-4-3. Audio DAC AK4351VT
AOUTL
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Check Point : U502 Pin 11
AOUTR
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Check Pont : U502 Pin 10
Failure Causes and Solution
If there are no audio output, you should check the input signal LRCLK, SCLK, SDTA and MCLK of Audio DAC U502.
And you may try to check the net concerning to audio L, R on R513, R514 and pin 11, 13 of U501.
When you had finished checking the above net or device and all these are OK, Audio DAC maybe damaged.
Then you can try to replace the Audio DAC.
4-5. Channel Test
4-5-1. When “NO SIGNAL” is displayed.
Check the RF cable is connected to LNB IN connector of rear panel. Then check U105(KA317 Regulator) pin 3
is powered between 21V to 24V. And check the voltage on L101 ~ L104 is proper level. When you had finished
checking the above net or device and all these are OK, Tuner maybe have problem. Replace the Tuner.
In case of Horz Polarity
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Check Pont : R125
LNBA
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Check Point : L106, (18V)