[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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