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         2008-03-14 

LC-19LE430E, LC-22LE430E, LC-26LE430, LC-32LE430E 

 49 

 

↓ 

 
 

LINE_FILTER_UNIT:              

↓ YES

 

 
 
 
 
 

 

POWER_UNIT                  

↓YES

  

 
 
 

↓YES 

 
 
 
 

↓YES 

 
 
 
 

↓YES 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Are the power cord and harness in the unit properly connected? 

NO 

Connect the power cord and harness properly, and turn on the 
power.

Is F9901 F9902 normal? 

NO 

 

LINE_FILTER_UNIT: 
Isn't TH9901,L9901,L9902,FB9902,FB9901 out of order? 
Moreover, whether the short-circuit with the circumference circuit 
is checked. 

Is C9803 (+395V) output? (Set the main power SW to ON.) 
 
 

Does the PFC circuit operate normally? 
(L9904, Q9801, D9811, IC9801 and etc. And, the circuit around 
the protection circuit etc. is checked.) 

NO 

 

Is a voltage of +5V applied to pin (12,13) of connector (CN9002)? 
(Set the main power SW to ON.)

 

Does the switching circuit operate normally? 
Check circuit around the primary side (T9301, IC9301, R9303, 
D9311, etc.), the secondary side (D9301, ZD9311, L9301, etc.), 
the AC_DET circuit (R9300, C9321, Q9313 etc.), and the 
protection circuit.

NO 

 

Are +12V and +24V output as for the power on/off switch when it is 
on?

 

NO 

 

Does the PFC circuit operate normally? 
Check circuit around the primary side (R9142, T9111, Q9121, 
Q9122, C9146 etc.), the secondary side (D9121, D9113, D9114, 
D9111, D9112 etc.), and the protection circuit.

 

POWER_UNIT: 
BD9901, FB9810, D9811, etc. out of order?  
Moreover, whether the short-circuit with the circumference circuit 
is checked. 

Similarly, is +12V output as for the power on/off switch when it is 
on?

 

 

Check +12V circuit of D9111, D9112 etc.

 

NO 

 

LC-19LE430E, LC-22LE430E, LC-26LE430E, LC-32LE430E 

50  

[2] MAIN BOARD TROUBLESHOOTING TABLE 

 

The sound is not emitted from the speaker though the picture has come out. 

↓ 

No sound output in all modes?

 

TEREMINAL UNIT:

   

    ↓ 

 

 

↓YES 

 

 

↓YES 

 
 

↓YES 

 
 

↓YES 

 
 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Is the audio signal output of IC U401 (I2S bus) normal? 

NO 

 

Check IC U401 and its peripheral circuits.

 

Is audio signal input to pin (15/20/21/22)(I2S bus) of IC U602 
(AMP)?

 

NO 

 

Check the lI2S bus trace between U602 and U401

Is MUTE circuit [Shutdown, OFF_MUTE] normal?

 

Is the audio signal output of pin (3, 4) (L-ch) and pin (1, 2) (R-ch) of 
CN601 (AOUDIO-CONNECTOR) normal? 

NO 

 

Check the Mute circuit. (Q603, Q652, Q653 etc.) 

Check IC U602 and its peripheral circuits.

 

Check Speaker Box (right and left) and wire harness.

 

NO 

 

         2008-03-14 

LC-19LE430E, LC-22LE430E, LC-26LE430, LC-32LE430E 

 51 

No sound (during the reception of  TV broadcasting) 

↓ 

Does not the sound go out though the picture has come out when TV is received?

 

MAIN UNIT:

  

 

    ↓ 

 

 

↓YES 
 
 
↓YES 

 

 
 
 

 

↓ 

Does not the sound of the audio signal input to SCART go out?

 

TEREMINAL UNIT:

   

    ↓ 

 

 
↓YES 

 
 

↓YES 

 
 

↓YES 

 
 
 
 

No sound from external input devices (2) 

↓ 

Does not the sound of the audio signal input to AV (Component) go out?

 

MAIN UNIT:

  

 

    ↓ 

 

 

↓YES 
 
 
↓YES 

 
 

↓YES 

 
 
 
 
 
 
 

Is the IF signal output from pin (13&14) of TUNER (TU101)/ pin 
(10&11) of TUNER (TU102)?

 

NO 

 

Check the tuner and its peripheral circuits. Replace as required.

Refer to “No sound output in all modes”.

 

Is the audio signal properly sent to pin (6) (SCT1_AUL_IN) and pin 
(2) (SCT1_AUR_IN) of SCART (CN151)?

Check the setting of an external input device that connects of 
CN151

NO 

 

Is the audio signal properly sent to pin (2&15) of IC U605?

 

NO 

 

Check the line between CN151 and IC U605

Is the audio signal properly sent to pin (194&196) of IC U401?

Is the audio signal properly sent to pin (2)(AV1_AudioLIN) and pin 
(4)(AV1_AudioRIN) of CN116?

 

NO 

 

Check the connection to CN116 and the external input device.

 

Is the audio signal properly sent to pin (194&196) of IC U401?

Is the audio signal properly sent to pin (5) and pin (14) of IC U605?

NO 

 

Check the line between CN116 and IC U605.

Is the IF signal sent to pin (184&185) of IC U401?

 

NO 

 

Check IC U401 its peripheral circuits.

 

Is the audio signal properly sent to pin (194&196) of IC U401?

Refer to “No sound output in all modes”.

 

NO 

 

Check the line between U605 and IC U401

 

Refer to “No sound output in all modes”.

 

NO 

 

LC-19LE430E, LC-22LE430E, LC-26LE430E, LC-32LE430E 

52  

 

↓ 

Does not the sound of the audio signal input to AV (Composite) go out?

 

MAIN UNIT:

  

 

    ↓ 

 

 

↓YES 
 
 
↓YES 

 
 

↓YES 

 
 
 
 
 

No sound from external input devices (4) 

↓ 

Does not the sound of the audio signal input to VGA go out? 

MAIN UNIT:

  

 

    ↓ 

 

 

↓YES 
 
 
↓YES 

 
 

↓YES 

 
 
 
 
 

No sound from external input devices (5) 

↓ 

Does not the sound of the audio signal input to HDMI1/2 go out?

 

↓ 

 

 

↓YES 

 
 
 
 
 
 
 
 
 

Is the audio signal properly sent to pin (4) (AV1_AudioLIN) and pin 
(6) (AV1_AudioRIN) of CN136?

 

NO 

 

Check the connection to CN136 and the external input device.

Is the audio signal properly sent to pin (194&196) of IC U401?

Is the audio signal properly sent to pin (4) and pin (11) of IC U605?

NO 

 

Check the line between CN136 and IC U605.

Is the audio signal properly sent to pin (2) (VGA_AudioLIN) and pin 
(3) (VGA_AudioRIN) of CN102?

 

NO 

 

Check the connection to CN102 and the external input device.

Is the audio signal properly sent to pin (194&196) of IC U401?

Is the audio signal properly sent to pin (1) and pin (12) of IC U605?

NO 

 

Check the line between CN102 and IC U605.

Refer to “No sound output in all modes”

 

Is picture of the signal input from HDMI1/2 displayed?

 

NO 

 

Refer to “Does not the picture of the HDMI signal input to 
HDMI1/2 go out?”

 

Check the line between U605 and IC U401

 

Refer to “No sound output in all modes”.

 

NO 

 

Check the line between U605 and IC U401.

 

Refer to “No sound output in all modes”.

 

NO