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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
Sharp 25F-S50 no sound

 

 


xtreem
New User

Feb 14, 2003, 7:52 AM

Post #1 of 2 (2142 views)
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Sharp 25F-S50 no sound Can't Post

I hate working on Sharps! Not much info on the web and hard to find parts! I have a 25F-S50 with absolutely no sound. Picture is great. Both audio amps IC351 &352 have the same voltages. pin 1 grnd, 2 grnd, 3 13.2v, 4 grnd, 5 12.6v, 6 1.44v, 7 236mv, 8 2.3mv. Pin 5 is the audio output and I have 12 volts on it. Does any one know if there is a common fault with shorting caps or the audio board in this unit? I haven't been able to find a schematic for the audio IC3001. It is a Sharp X1535CE. Thanks!



BL_Thompson
TV Repair Authority

Feb 14, 2003, 4:59 PM

Post #2 of 2 (2139 views)
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Re: [xtreem] Sharp 25F-S50 no sound [In reply to] Can't Post

This from the Sharp website: CHECK PIN 10 OF IC2001. THIS IS THE MUTE PIN. IT MUST BE LOW. IF IT IS HIGH, THEN THE MICRO IS MUTING THE AUDIO. CHECK PIN 3. IT SHOULD BE AROUND 2.9V AND PIN 5 IS THE SIGNAL DETECT. IT SHOULD BE .7V. IC201 PIN 55,56 SHOULD HAVE A LOW AUDIO SIGNAL AND THE OUTPUT PINS 1,2 WILL HAVE VERY LOW DISTORTED AUDIO.

You may also want to check D2107.
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Bryan Thompson
Spyder Byte Services
Albuquerque, NM

 
 
 


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