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6 Fault finding, Block diagram 13L7.2E

6 Fault finding, Block diagram

LED

Continuously

ON ?

No picture

No Sound

SWITCH - ON

THE TV. SET

No

Yes

LED Blinking?

(not error codes)

Peak voltage

at pin 6 IC7520 [A1]

>2v5?

Voltage

at pin 14 IC7520 [A1]

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http://../Workdir/Frontpg1.pdf

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http://../Workdir/Frontpg1.pdf

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7 Diagrams and print lay-outs 16L7.2E

7 Diagrams and print lay-outs

015_008.EPS

2V / div DC5s / div

P4 (3 - 7520)

2V / div DC

5s / div

5V / div DC5ms / div

0.5V / div DC5s / div

P2 (C - 6510)

P3 (S - 7518)

P4 (3 - 7520)

P5 (1 - 7520)14V DC

P1 (7 - 5545)

100V / div DC5ms / div

P7 (6 - 7520)

0.5V / div DC5s / div

P6 (10 - 7520)

P10 (C - 6550)

95V DC

P10 (C - 6550)104V DC

P11 (C - 6570)16V DC

P11 (C - 6570)14.4V DC

P12 (6 - 7541)2.1V DC

P12 (6 - 7541)2V DC

P13 (2 - 7541)14.5V DC

P13 (2 - 7541)13.6V DC

P14 (8 - 7541)8V DC

P14 (8 - 7541)0.6V DC

P15 (9 - 7541)5V DC

P15 (9 - 7541)5V DC

P9 (14 - 7520)

0.5V / div DC5s / div

P8 (7 - 7520)

0.5V / div DC5s / div

1V / div DC5s / div

http://../Workdir/Frontpg1.pdfhttp://../Workdir/Frontpg1.pdf

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http://../Workdir/Frontpg1.pdf

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7 Diagrams and print lay-outs 19L7.2E

20V / div DC5ms / div

0.5V / div DC5ms / div

2V / div DC20s / div

100V / div DC20s / div

1V / div DC20s / div

L1 (C - 7445) L2 (3445 / 3442)S1 (41 - 7225 - 5D)

2V / div DC20s / div

2V / div DC20s / div

L3 (E- 7440) L4 (40 - 7225 - 5D)

0.5V / div DC5ms / div

F1 (7- 7401) F2 (1 - 7401)L11 (C - 6454)5V DC

L12 (C - 6443)13V DC

10V / div DC5ms / div

F3 (5- 7401) F4 (3 - 7401)

015_009.EPS

http://../Workdir/Frontpg1.pdfhttp://../Workdir/Frontpg1.pdf

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7 Diagrams and print lay-outs 20L7.2E

1V / div DC20s / div

V15 (4M7)

V8 (5 - 7255)

1V / div DC20s / div

1V / div DC20s / div

1V / div DC20s / div

V2 (38 - 7225 - 5B) V3 (28 - 7225 - 5B)V1 (13 - 7225 - 5B)

0.5V / div DC20s / div

V4 (29 - 7225 - 5B)

0.5V / div DC20s / div

V7 (16 - 7241)

0.5V / div DC20s / div

1V / div DC20s / div

V9 (16 - 7255)

0.5V / div DC20s / div

V11 (11 - 7255)

1V / div DC20s / div

1V / div DC20s / div

0.5V / div DC

20s / div

V13 (3M7)

V14 (2M7)

V12 (12 - 7225)

1V / div DC20s / div

0.2V / div AC20s / div

I1 (6 - 7225 - 5A)

0.5V / div DC20s / div

I3 (1 - Tuner)

I4 (1 - Tuner)only FST tuner

I5 (2 - Tuner)2V DC

0.5V / div DC20s / div

V5 (30 - 7225 - 5B) V6 (11 - 7225 - 5B)3.5V DC (PAL)

0.5V / div DC20s / div

V10 (14 - 7255)

I2 (IF - Tuner)

015_010.EPS

http://../Workdir/Frontpg1.pdfhttp://../Workdir/Frontpg1.pdf

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7 Diagrams and print lay-outs 21L7.2E

1V / div DC0.5s / div

C5 (41 - 7600)

1V / div DC5ms / div

1V / div DC5ms / div

1V / div DC5ms / div

C2 (50 - 7600)

C3 (49 - 7600)

C4 (1 - 1670)(with RC5 signal)

C1 (52 - 7600)5V DC

1V / div DC0.5s / div

C6 (42 - 7600)

015_011.EPS

http://../Workdir/Frontpg1.pdfhttp://../Workdir/Frontpg1.pdf

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7 Diagrams and print lay-outs 22L7.2E

A5 (Audio out)

1V / div DC0.5ms / div

5V / div AC1ms / div

1V / div DC0.5ms / div

A2 (55 - 7225 - 5E) A3 (15 - 7225 - 5E)

1V / div DC20s / div

A6 (Video out)

0.1V / div AC0.1ms / div

A1 (1 - 7225 - 5E) A4 (Audio out)

1V / div DC0.5ms / div

0.1V / div DC1ms / div

A7, A8, A9, A10

015_012.EPS

http://../Workdir/Frontpg1.pdfhttp://../Workdir/Frontpg1.pdf

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http://../Workdir/Frontpg1.pdf

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7 Diagrams and print lay-outs 24L7.2E

015_014.EPS

http://../Workdir/Frontpg1.pdfhttp://../Workdir/Frontpg1.pdf

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7 Diagrams and print lay-outs 25L7.2E

1

B

A

2 3 015_003.EPS100398

9503B19504B39505B39506B2

9507B29508A29510B29514B19515B3

0022B30033B10130B31501B2

2501B22502B12503B12504B12505A12506A1

2507A12508A22509A12510A1

2511B22512B22513A22514B22515B32516B3

2517B32518B32519B32520B3

2521B22522B12523B12524B12525A23501B2

3502B23503B23504B23505B2

3506B13507B23508B13509A13510B13511A1

3522A23523A23524A23525B2

3526B23527B23528B23529B23530B23531A2

3532B23533B23534B33536B3

3537B33539B23540B25501B16501B16502B2

6503B26504B36505B37220B3

7501B17502B37503B27504B27505A17506A1

7507B17508B27509B27510B2

7511A17512A17513A17514A17515A29501B1

1

B

A

23

0022B30033B10130B31202B21203B21204A22201B2*2202B2*2203B2

2206B2*2207B2*2208A22209A1*2210B2*2211A1*2212A1*2213A2*2214A2*2215A2*2216A1*2217A1*2220A1*2221A1*2224A2*2225A2*2226A2*2227A1*2228A22229B12230A12231A1*

2232A1*2234A12235A1*2236A1*2237B2*2238B2*2239A1*2240A1*2241A12242A1*2243A1*2244A1*2245B12246B1*2247B1*2248B12249B1*2250B12251B1*2252A12253B1*2254B1*

2255A22256B3*2257B32260A12261A22262A22263A22264B32265B3*2266B1*2267B1*2268B12271B3*2272B3*2273B1*2274A1*2276A1*2277A1*2278A1*2279A2*2280A1*2281A1*

3201B2*3202B2*3203B2*3207B2*3211B2*3213B33214B2*3215B2*3216B13217B13218A2*3219A2*3220A2*3221A2*3222B2*3223A2*3224A1*3227A1*3228B2*

3229B1*3230B1*3233B1*3234B1*3235A1*3238B1*3239B1*3240A1*3242A1*

3243B1*3244B1*3246B23247B13248B1*3249B33250B23251B3*3252B3*3253B3*3254B24200B2*4201A2*4203B2*4204B2*4205B2*4206B2*4207B2*4209B2*4211B3*4214B2*4220B1*

4221B1*4222B1*4223B1*4233A1*5201B2*5202B25203B15204A15205A25206B25207B26201B26202B26204A16205B16206B36207B37201B27202A17203B17204B37205B2*

7207B2*7208B2*7209B1*7210B2*7211A2*7212A2*7214B17215B2*7216B2*7220B39200B19201B29202B29205B39206A29207A29208B19209A29210B19211B19212B19213B3

9214A29215B29216B19217B29220B29221B39223B19224B29257B3

*=chipcomponent

1

B

A

2 3 015_008.EPS170398

http://../Workdir/Frontpg1.pdfhttp://../Workdir/Frontpg1.pdf

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7 Diagrams and print lay-outs 26L7.2E

015_015.EPS

http://../Workdir/Frontpg1.pdfhttp://../Workdir/Frontpg1.pdf