Wednesday, December 02, 2015

How to enter service mode Samsung tv - SAMSUNG LTN325W - LTN406W SERVICE MODE AND TROUBLE SHOOTING

Contents of this article 

  • Service mode 
  • Troubleshooting 


SAMSUNG LTN325W - LTN406

SERVICE MODE AND TROUBLE SHOOTING 


Troubleshooting
No Power
1. Does proper DC 6V appear at Pin 1 of power S/W board CN130?
2. Does proper DC 6V appear at Pin 3 of input board CN144?
3. Does proper DC 6V appear at Pin 3 main board CN505?
4. Does proper DC 5V appear at Pin 4 main board IC800? > Check IC800 and main power.
5. Does proper DC 3 V appear at Pin 3 main board IC801? > Check IC952, IC955 and IC958.
6. Check IC917, IC902, IC901 and IC900.
No Video (CVBS)
1. Does proper signal appear at Pin 26 of input board CN136?
2. Does proper signal appear at Pin 15 of main board IC700? > Check IC700 and related circuit.
3. Does proper clock pulse at Pin 3 of main board IC200 and communicates with Pin 178 and 179? > Check IC200 and related circuit.
4. Does proper clock pulse at Pin 205 of main board IC434 and communicates with Pin 1 and 2? > Check IC400 and related circuit.
5. Does proper clock pulse at Pin 31, 27 and 28 of main board IC500? > Check IC434 and related circuit.
6. Does proper clock pulse at Pin 37, 39 and 40 of main board IC500? > Check IC500 and related circuit.
No Video (S-Video)
7. Does proper signal appear at Pin 26 and 28 of main board CN505?
8. Does proper signal appear at Pin 18 and 19 of main board IC701? > Check IC701 and related circuit.
9. Does proper clock pulse at Pin 3 of main board IC200 and communicates with Pin 178 and 179? > Check IC200 and related circuit.
10. Does proper clock pulse at Pin 205 of main board IC434 and communicates with Pin 1 and 2? > Check IC400 and related circuit.
11. Does proper clock pulse at Pin 31, 27 and 28 of main board IC500 > Check IC434 and related circuit.
12. Does proper clock pulse at Pin 37, 39 and 40 of main board IC500? > Check IC500 and related circuit.
No Screen (DVD)
1. Does proper signal appear at Pin 4, 14 and 15 of main board IC102? > Check IC102 and related circuit.
2. Does proper signal appear at Pin 16, 17 and 18 of main board IC702? > Check IC702 and related circuit.
3. Does proper synchronization pulse at Pin 64 and 66 of main board IC202 and communicates with Pin 56 and 57? > Check IC202 and related circuit.
4. Does proper synchronization pulse at Pin 30, 31 of main board IC202? > Check IC205 and related circuit.
5. Does proper clock pulse at Pin 71~78, 2~10 of main board IC202? > Check IC202 and related circuit.
6. Does proper clock pulse at Pin 3 of main board IC200 and communicates with Pin 178 and 179? > Check IC200 and related circuit.
7. Does proper clock pulse at Pin 205 of main board IC434 and communicates with Pin 1 and 2? > Check IC400 and related circuit.
8. Does proper clock pulse at Pin 31, 27, 28 of main board IC500? > Check IC434 and related circuit.
9. Does proper clock pulse at Pin 37, 39, 40 of main board IC500? > Check IC500 and related circuit.
No Screen (D-TV)
1. Does proper signal appear at Pin 4, 14 and 15 of main board CN101?
2. Does proper signal appear at Pin 16, 17 and 18 of main board IC702? > Check IC702 and related circuit.
3. Does proper synchronization pulse at Pin 64 and 66 of main board IC202 and communicates with Pin 56 and 57? > Check IC202 and related circuit.
4. Does proper synchronization pulse at Pin 30, 31 of main board IC202? > Check IC205 and related circuit.
5. Does proper clock pulse at Pin 71~78, 2~10 of main board IC202? > Check IC202 and related circuit.
6. Does proper clock pulse at Pin 3 of main board IC200 and communicates with Pin 178 and 179? > Check IC200 and related circuit.
7. Does proper clock pulse at Pin 31, 27, 28 of main board IC500? > Check IC434 and related circuit.
8. Does proper clock pulse at Pin 37, 39, 40 of main board IC500? > Check IC500 and related circuit.
No Screen [PC signal(Along)]
1. Does proper input signal appear at Pin 8, 9, 10, 12 and 13 of main board CN507?
2. Does proper signal appear at Pin 3, 6 (H-sync), 8 and 10 (V-sync) main board IC907? > Check IC907 and related circuit.
3. Does proper input signal appear at Pin 6, 8 of main board IC903? > Check IC903 and related circuit.
4. Does proper communicate pulse appear at Pin R410 and R457 of main board IC400? > Check IC400 and related circuit.
5.Does proper signal appear at Pin 37, 39, 40 and 37 of main board IC500? > Check IC500 and related circuit.
6. Does proper input signal appear at Pin 18, 19, 21, 22, 24, 25, 27 and 28 of main board CN507? > Check cable and input board.
7. Does proper signal appear at Pin 48 (H-sync) and 47 (V-sync) main board IC300? > Check IC300 and related circuit.
8. Does proper input signal appear at Pin 4, 10 of main board IC903? > Check IC903 and related circuit.
9. Does proper communicate pulse appear at Pin R410 and R457 of main board IC400? > Check IC400 and related circuit.
10. Does proper signal appear at Pin 39, 40 and 37 of main board IC500? > Check IC500 and related circuit.
Factory Mode Adjustments
Entering Factory Mode
1. To enter “Service Mode” Press the remote -control keys in this sequence :
If you do not have Factory remote – contro
POWER OFF > MUTE > 1 > 8 > 2 > POWER ON
If you have Factory remote – control
POWER ON > DISPLAY > FACTORY
SUB Menu 1
In sub menu 1,you can adjust the white balance.
As the adjustment and data values differ depending on input sources, different adjustments are required for RF, DVD, DTV and PC modes.
Optimum condition data for each mode are saved as default values. (Refer to Table, W/B default value)
As the RF mode is applied with the same values as for video and S-VHS, adjustment can be made in any of RF, video and S-VHS modes.

W/B default value

Conditions for Measurement
On the basis of ToshibaABL Pattern
Optical measuring device : CA210
1. Set the input to the mode in which the adjustment will be made (RF/DVD/DTV/PC).
The sequence of adjustment is RF >
 DVD > DTV > PC.
2. Enter factory video adjust, confirm the data,and if it differs from the default values, perform video
recall and return to factory video adjust.
*Video recall restores the values in video adjust to the default.
3. Adjust the low value.

- Adjust green cutoff to set the Y value (except for PC).
- Adjust red cutoff and blue cutoff to the color coordinates.
*For the high value, the gain value is fixed to the default and is not adjusted.