SAMSUNG Mm-26 Troubleshooting
6. Troubleshooting
6-1 Main
6-1-1 Power Malfunction
Front PCB -com VDD(5V) |
No |
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Main PCB RIC1(BA3950) IN: 20V |
No |
Check the Power PCB; |
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normal? |
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RF4 (T3.15 AL 250V) |
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UIC1 pin no. 9,36,37 |
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Input voltage normal? |
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Yes |
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Yes |
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Replace RIC1 |
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Front PCB |
No |
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FRONT PCB POSNS |
No |
Check the Main PCB |
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Does UX1(4.5MHz) |
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voltage normal ? |
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RZD2,RC4,RR3,RR4, |
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oscillate ? |
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(pin no. 13 ;5.0V) |
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RR2,RC1,RD1 |
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Yes |
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Yes |
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Front PCB |
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No |
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When the power is |
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Replace -com |
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ON 'H' displays |
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at pin no. 49 ?(5V) |
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Yes
Connect Front PCB and Main PCB.
Check the connector Main PCB.
Wafer JWC3,JWC4
Samsung Electronics |
6-1 |
Troubleshooting
6-1-2 No Output
Main PCB AIC1(LM1876TF) pin no. 4,2,15
B+,B- circuits
Yes
AQ1L/1R Base B+ ?
Yes
Is Mute selected ?
No
Headphone Jack short ?
No |
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Check the B+ power |
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source part in RD2(PBL403), |
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RC3 and RC14. |
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No |
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Confirm for TR short |
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replace it. |
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Yes
Remove it with Remocon
Yes
Replace Headphone jack soldering condition
6-2 |
Samsung Electronics |
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