[TechAssist] Re: Philips / Magnavox TS2744C103 Chassis # 27B8 No Video, no OSD, Sound is OK.

  • From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
  • To: <techassist@xxxxxxxxxxxxx>
  • Date: Fri, 22 Nov 2002 07:00:59 -0500

Leroy,
Install the original EEPROM. I have had replacements that were blank. I
always install a socket so I can remove it in the future without resoldering
it.

Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx

----- Original Message -----
From: "LeRoy Westlund" <llw@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, November 21, 2002 9:26 PM
Subject: [TechAssist] Re: Philips / Magnavox TS2744C103 Chassis # 27B8 No
Video, no OSD, Sound is OK.


>
> Thanks Bob,...but, I have saved that post from last time.
> Already checked everything suggested. (More then once).
> I need some NEW suggestions on this one.
> I have the factory remote,...but, it won't reset the eeprom.
>
> Regards,
> LLW
>
> LeRoy Westlund
> Westlund TV & Electronics          " It's such a pretty world
> 93 North Main                                          today !....
> Centerfield, UT 84622-0087           Look at the Sunshine. "
> Ph./Fax  435-528-3822                               :-)
> mailto:LLW@xxxxxxxxxx
>
> -----Original Message-----
> From: Gemini Computer & TV <geminitv@xxxxxxxxxxxxxxxx>
> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
> Date: Thursday, November 21, 2002 4:22 PM
> Subject: [TechAssist] Re: Philips / Magnavox TS2744C103 Chassis # 27B8 No
> Video, no OSD, Sound is OK.
>
>
> >
> >Leroy,
> >See if any of these apply:
> >
> >Symptom:  Dim raster with faint colored bars from top to bottom. No
> response
> >to changes of video, no menu or graphics on the screen.
> >Cause:  The beams in the CRT are deflected into the CRT neck and scatter
at
> >random across the screen.  This is caused by either a loss of Minus 13.5
> >volts to IC500 (vertical out) or IC500 itself.
> >Cure:  Check and replace as needed; R420, D409, C419, IC500.
> >
> >----------------------------------------------------
> >
> >Symptom:  High Voltage (EHT) remains but there is no:
> >OSD - Menu
> >Video - Raster
> >Sound
> >There may be a faint line across the top of the CRT.
> >Cause:  Information in the EEPROM (IC346) is incorrect.  This results in
> >deadlock of the BIMOS Signal Processor.  Caused in one instance when
> >Register 66 on Service Page A was adjusted to FF and stored.
> >Cure:  If in the Service Mode exit by pressing 9, then + (volume up).
The
> >set will shut off.  Power on and enter the Service Mode by 06-25-95-MENU.
> >Press A/CH (Surf).  ROM defaults will be written to the EEPROM and normal
> >operation will come back.
> >Note:  At this point all items in the Service Mode will have to adjusted
> for
> >proper operation.
> >
> >
> >Bob Waterman, CET® #RI-28
> >Master Technician License #9109
> >Service Manager
> >Gemini Computer, TV, & Security Alarms
> >(508)695-7302
> >(508)695-7769 FAX
> >geminitv@xxxxxxxxxxxxxxxx
> >geminitv@xxxxxxx
> >
> >
> >----- Original Message -----
> >From: "LeRoy Westlund" <llw@xxxxxxxxxx>
> >To: "TechAssist" <techassist@xxxxxxxxxxxxx>
> >Sent: Thursday, November 21, 2002 12:04 PM
> >Subject: [TechAssist] Philips / Magnavox TS2744C103 Chassis # 27B8 No
> Video,
> >no OSD, Sound is OK.
> >
> >
> >>
> >> Hi members,
> >> I have fixed 2 or 3 of these sets for the traditional Vertical
problems.
> >> This one is giving me nightmares.
> >>
> >> After replacing IC500, D409, and R420, my vertical seems to be
OK,...but,
> >> now I have a dark screen, with NO video or OSD. There is a white line
> >across
> >> the top, about 1/2 inch thick. If I turn up my screen control, it goes
to
> >> gray raster, with retrace lines.
> >>
> >> I have found about 20 fixes for this problem. They all seem to be
> >Vertical,
> >> or IC500 related. Also,...some have been fixed by replacing the Eprom.
> >> I have rechecked my work in the vertical area.(NO lifted traces.).
> >> I have replaced the Eprom (NO change), but can't access the service
menu,
> >> due to the NO OSD problem. I have replaced IC271.(problem remains).
> >> The voltages on IC500 are:
> >> Pin # 1 - .4 volts
> >>           2 - +12.5
> >>           3 -  -10.5
> >>           4 -  -12.5
> >>           5 -  .2
> >>           6 - +13.5
> >>           7 -  .4
> >> I have also had to replace R58 (20 ohms), and IC 52 (TDA6106Q), on the
> CRT
> >> board.(For shutdown problems).
> >> In other words,...This set had multiple problems,...but, now,...there
is
> >> ONLY ONE problem left. Hate to junk it after spending so much time and
> >money
> >> on it,...But,..it is now becoming a matter of principal. I will not
> >> rest,...until I find, and fix this problem !
> >>
> >> Any help is appreciated,
> >> LLW
> >>
> >>  LeRoy Westlund
> >> Westlund TV & Electronics          " It's such a pretty world
> >> 93 North Main                                          today !....
> >> Centerfield, UT 84622-0087           Look at the Sunshine. "
> >> Ph./Fax  435-528-3822                               :-)
> >> mailto:LLW@xxxxxxxxxx
> >>
> >>
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