I stupidly forgot to give the numbers on the tuner: It's the larger of the two tuners.location U101. HC00221 Sony D BTF-WB451 Hitachi# ? cannot locate. Anyone have it for the record? Thnks, Phil Bader Phil Bader wrote: > > My response to Alvie below: > (Thanks, Bob). > As usual, Alvie you are always so gratious to help, as you have in the > past. > I wanted to share the fix. > I listened carefully when the sound went out. I realised the "buzz" that > remained was the 4.5 MHz sound carrier. Ahh, "IF"... The main tuner > "U101" is an > integrated Sony tuner with audio and video IF processing internally. > I happened to have a tuner and swapped it out. The set even has a better > video > display now,(it seemed to have a silver effect to the bright areas > before) and > sound is clear, and has been on for an hour OK. Looks like U101 was the > fix. > Inside Tuner U101 is an: > IC02: SBX1838-01 (Sony IC,looks like a large version of a SBX1637, has > 10 smd > caps) , > IC01:(Sony IC) CXA1446S > Trace side: > two SMD ICs: > numbers: DA5633 (Philips) and 4092FP (Mitsubishi) > ceramic filters: SWF01, SWF02. > Not sure the culprit. any guesses? > Thanks, all, for the assistance. > A true Thanksgiving week. > Phil Bader > > "Alvie Rodgers C.E.T." wrote: > > > Hey Phil: > > I don't have much on this symptom: > > Here's some: > > > > Symptom: NO AUDIO. MUTE ACTIVATED. NOTE: C461 IS LABELED K464 ON THE PWB. > > Cause: C461 SHORTING ACROSS R426 or K467. CAPACITOR IS BENT TO THE LEFT. > > BEND THE CAPACITOR TO THE RIGHT, AS VIEW FROM THE BACK. LOCATION: JUST > > BEHING THE REAR JACK PANEL PLASTIC, JUST IN FRONT OF THE 8 TUNER. NOTE: C461 > > IS LABELED K464 ON THE PWB > > > > Symptom: LOW AUDIO > > Cause: REPLACE IZ01 > > > > Do you have any activity on pin 48 of the Microprocessor? > > Do you have any activity on Emitter of the Q013? > > Do you have any activity on Base of the Q403? > > What's the DC potential of pin 11 of I401 with and without Audio? > > > > ********************** > > Alvie Rodgers C.E.T. > > Technical Writer/Trainer > > Hitachi Home Electronics > > www.hitachiserviceusa.com > > > > Please post your repair for others > > to benefit. > > ********************** > > > > ----- Original Message ----- > > From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx> > > To: "Alvie Rodgers C. E. T." <rodgers@xxxxxxxxx>; <tjanphyl@xxxxxxxxxxxxxxx> > > Sent: Monday, November 24, 2003 6:56 PM > > Subject: Hitachi Ultravision 46UX24B loses sound after warm > > > > Phil, > > I have forwarded this to Alvie Rodgers from Hitachi for his advice and > > expertise. > > > > Bob Waterman, CET® #RI-28 > > Master Technician License #9109 > > Service Manager / Parts Manager > > Gemini Computer, TV, & Security Alarms > > (508)695-7302 > > (508)695-7769 FAX > > geminitv@xxxxxxxxxxxxxxxx > > geminitv@xxxxxxx > > www.geminicomputertvsecurityalarms.com > > > > ----- Original Message ----- > > From: "Philip Bader" <tjanphyl@xxxxxxxxxxxxxxx> > > To: <techassist@xxxxxxxxxxxxx> > > Sent: Monday, November 24, 2003 2:44 PM > > Subject: [TechAssist] Hitachi Ultravision 46UX24B loses sound after warm. > > > > > Came in with sound working.After 10-20 min I noticed no audio. Turning > > > up volume I hear a low buzz ( like a mic with bad ground). > > > Has a jack panel with Sony ICs.Cool sprayed aropund, no effect so far. > > > Any histories on this? > > > I'm downloading the pdf on it, but going slow today. > > > Of course this was dropped off just before close Saturday, she called > > > this morning for a "status"... > > > Thanks, > > > Phil > > > -- > > > Philip Bader > > > Jan Phyl TV Inc. (estab. 1976) > > > 3420 Recker Hwy. Winter Haven, Fl. 33880 > > > Fax (863) 299-8821 > > > email: tjanphyl@xxxxxxxxxxxxxxx > > > > > > > > **************************************************************************** > > * > > > Lost Password: > > > http://www.tech-assist.org and select "Login Problems?". > > > Email Archives: > > > //www.freelists.org/archives/techassist/ > > > > > -- > Philip Bader > Jan Phyl TV Inc > 3420 Recker Hwy > Winter Haven, Fl. 33880 > Fax: 863-299-8821 > "consumer electronics service since 1977" > > ***************************************************************************** > Lost Password: > http://www.tech-assist.org and select "Login Problems?". > Email Archives: > //www.freelists.org/archives/techassist/ -- Philip Bader Jan Phyl TV Inc. (estab. 1976) 3420 Recker Hwy. Winter Haven, Fl. 33880 Fax (863) 299-8821 email: tjanphyl@xxxxxxxxxxxxxxx ***************************************************************************** Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/