Question about Sanyo DS24425 24" TV

1 Answer

HELP!!!! Hello all. I'm having some SERIOUS probs with my girlfriend's mother's refurbed Sanyo DS-24425-02. Originally, I thought the problem may lie in the onboard tuner, as the initial issue was with the TV accepting a split from a cable box, and the auto-shut-off feature. However, after pulling the RF cable line and replacing the screw-type RF connector with a push-type adaptor and adding an inline booster, the problem persisted. So then i started messing around in the service menu. Using the service manual as a guide, i reset all values outlined in the "if eeprom is replaced" section...they were mostly wrong at the outset. and then something very strange happened. Halfway through this process, the onscreen display quit, the TV display lost about 1/2 brightness, and now the set is stuck in some half-mode b/w service and standard operation. Any attempt to restart the service mode leaves me able to adjust certain features, but there is no onscreen display, either in "service" or "standard" modes. It's obvious I need to erase/flash the eeprom (IC802), but I cannot find a SINGLE method on how to do this, save for a few mentions of unplugging the set from AC over 4 hours, which does NOTHING. Do I need to replace the IC? Is there a way to reset the eeproms from outside the box? Is the TV finished? HELP!!!!! Please write me at jeffreyp@ocularnutrition.ca as opposed to PM's if you please. However, PM's will do in a pinch, of course...

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  • Stairs Dec 01, 2007

    Cheers.  thanx for the quick response.  I'm used to troubleshooting film/video equipment, and know my way around IC's and circuit boards, but I am certainly no expert.  I really appreciate the help.


    I'm assuming you have the same SM I do...



    I should explain that at this point, I do believe I've troubleshooted the problem to this IC802, the Eeprom, which controls everything the tuner does not on the input side of the CPU (IC801).


    The set works fine with inputs into both front and rear component and composite through both a cable box and stand-alone DVD player.  Blue colour values are piss poor through RCA, so I adapted to S-Video and that seems to work fine.  The set will work as a monitor-only in this fashion, if connected to the cable box via one of these methods.


    The Tuner, however, is stuck in Channels 1-13 Only...forgive me, is that VHF or UHF?  I can only assume this is due to the wrong code somewhere in the Service Menu, though problems with intermittent cable reception were the first symptoms of trouble...


    Obviously, my experiments inside the service menu have exacerbated the problem.  To be Fair, I did nothing outside of activate the menu and change the values to those outlined in the SM...well, tried to...on the "6" series, as I compared the screen against the values on the print-out, the on-screen display disappeared, never to re-appear again.


    Or so I thought; 



    I had said before that the Service Menu no longer functioned.  I was wrong.  The SM works fine, and can be accessed at will, it's the on-screen display that isn't fuctioning.



    Almost out of rote, I tried the ol' service mode trigger this afternoon, and was met with a barely visable, but still useable, on-screen display for the service menu!


    "Good enough" I yelled, and got to work rectifying whatever damage I assumed I'd done.  I was surprised to find the OPT1 and 2 codes were still right, and again, went about reseting improper values, squinting to see the faint outline of the lime-neon green OSD (which is driven by the Eeprom).


    Again, the menu OSD disappeared,this time during the middle of the "5" series.  Not to return.


    I'm stumped.  I'm more than ready to swap the IC (I used to solder old tv sets etc. at a job at an electronic surplus store.), but the service manual has plenty of nomenclature on reseting the CPU and Eeproms, so there has to be a way to do this, to say nothing of the fact that despite the absent OSD, the stupid thing seems to be working fine (since I'm sure I can fix the tuner once inside the working service menu!.)


    Ack.

  • Stairs Dec 01, 2007

    Oh!  I found a datasheet for the IC that said it drove the OSD.  so i'm making more assumptions...sadly.




    I figured the IC was one of those newfangled chips that handled everything beyond the inline tuner.


    any hints? or should I just have it serviced?

  • Stairs Dec 01, 2007

    rereading your comment--are you saying the CPU is ruined as well?




    OMG.  What have I done...

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  • Master
  • 1,284 Answers

The values in the service manual are just to get the TV running. The values that were in the TV were all correct for the CRT, deflection yoke, high voltage transformer. These values are changable as NO two parts are alike and have to be aligned accrodingly. You most likely will need to replace the EEPROM now to get back to center or factore defaults. By the way, you only have to unplug the set for 2 minutes for a reset to occur.

Posted on Dec 01, 2007

  • Don
    Don Dec 01, 2007

    The OSD are driven by the micro. The EEPROM is only for memory. The micro tells the jungle IC (video/horiz/vert/chroma proc) where to blank so it can insert the OSD info. The OSD is filled in by the appropriate color then.

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