SAMSUNG Mm-26 Troubleshooting

6. Troubleshooting

6-1 Main

6-1-1 Power Malfunction

Samsung Electronics 6-1

Front PCB µ-com VDD(5V)

normal?

UIC1 pin no. 9,36,37

Replace RIC1

Main PCB RIC1(BA3950) IN: 20V

Input voltage normal?

Yes

Check the Power PCB;
RF4 (T3.15 AL 250V)

Yes

Front PCB

Does UX1(4.5MHz)

oscillate ?

FRONT PCB POSNS

voltage normal ?

(pin no. 13 ;5.0V)

Check the Main PCB
RZD2,RC4,RR3,RR4,
RR2,RC1,RD1

Replace µ-com

Yes

Yes

Front PCB

When the power is

ON 'H' displays

at pin no. 49 ?(5V)

Yes

Connect Front PCB and Main PCB.

Check the connector Main PCB.

Wafer JWC3,JWC4

No

No

No

No

No

6-2 Samsung Electronics

Troubleshooting

6-1-2 No Output

Yes

AQ1L/1R Base B+ ?

Yes

Is Mute selected ?

Headphone Jack short ?

Remove it with Remocon

Replace Headphone jack
soldering condition

Main PCB AIC1(LM1876TF)

pin no. 4,2,15

B+,B- circuits

Check the B+ power
source part in RD2(PBL403),
RC3 and RC14.

Yes

Confirm for TR short
replace it.

Yes

No

No

No