[TechAssist] Re: RCA ctc169CF F27228ET no sound after lightning 2nd request
- From: Jorge Camboni <geo@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 10 Aug 2003 15:34:44 -0500
Most likely the EEPROM
Jorge
At 09:56 a.m. 10/08/03 -0400, you wrote:
>This TV had no audio after lightning. Picture is good. There is no audio at
>pins 34 and 35 (left and right audio out ) of U1600 (DBX decoder). Voltages
>on that ic are good except for pins 29 and 32. Should have 0 v on them and
>we have 5v. These voltages appear to be controlled by U1602 (I/O bus
>expander) and U1410 (audio switch) but our audio schematic (Sams 3175)
>doesn't quite jive with what's in the tv.
>
>We have checked the obvious: internal/external speaker switch and "speaker
>on" in menu. Mute button on remote makes word "mute" appear and disappear on
>sceen. One thing that may be relevant: When menu is pressed on the remote,
>the word "mute" comes up on a list with "audio", "video", and "setup." Can't
>bring up anything additional with menu "mute" but the other menu items work
>normally.
>
>We also have an RCA ctc169CA2 G27221WK that came in after storm. Had a bad
>tuner. We repaired trace in tuner and it also now has good pic but no sound.
>"Mute" also comes up on its menu list. Haven't done any further
>troubleshooting on it.
>
>Fixes, troubleshooting suggestions and/or exact audio schematic appreciated.
>
>Jeff Smith
>Smith TV Service
>1930 Main St
>Newberry, SC 29108
>803/276-4946
>Fax 208/247-7971
>
>
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Jorge Camboni, GY Electronics, Richardson, TX
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