Question about Sanyo AVM-2557 TV

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Sanyo 25" Standard Tube Vertical Deflection Problem

I have an older 25" Sanyo Standard Tube TV with a Vertical problem, all I have is a Horizontal line across the screen, have sound and there is a picture there, just can not view it because of the no vertical deflection issue.

  I have gone through the vertical circuit, replaced the output checked and replaced capacitors in the circuit, also checked voltages, however I'm not sure what the Pump Up Voltage should be, still no vertical deflection, I'm thinking its a vertical drive signal issue, but do not have a working scope to determine this, any ideas on this, has anyone run into this before?





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  • Mark Moore Oct 13, 2007

    Hi Modern

       Well, I got my scope working, there is plenty of drive too the vertical output, however on the Pump Up Pin there is vertually nothing, and as well vertually nothing to speak of on the Output Pin, I've checked the Yoke and Yoke path, all good, and I've checked the Pump Up Pin path and related components, nothing! I'll be honest at this point I'm pretty much decided this is a no fix situation.  I Also installed a known good vertical output IC as well.





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You can proceed as follow to fix it.

  1. reduce brightness to minimum to avoid screen burn.
  2. check voltage on vertical uotput
  3. check yoke connector for loose.
  4. check v/yoke winding.
  5. check v/drive from signal processor to vertical output

now your problem how to find out whether drive is there or not it is very simple even you donot have scope.

you simply touch with screw driver or meter prob  at the poibt where vertical signal is input to vertical stage

if h/line is spreadindg or tries to spread then your output is ok &problem is in drive ckt.

for schematic try given site give model no &download it

hope this will help



Posted on Oct 12, 2007


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