LGB 51750 with two switch connections not working

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nlevasseur

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Normally, I can find answers by searching the previous posts but not this time… Newish to this forum, and have been doing more with G scale LGB more recently. So I picked up a 51750 off eBay and when I hooked it up to test it with a signal switch motor, two of the rockers worked great while the other two were non functional.

I searched all previous posts on the forum and found nothing similar as to some faulty rocker switches. I have not metered anything.

The 51750 is hooked up to the ac terminals on a LGB transformer with short leads.

Functional meaning they would actuate the 5094 signal switch motor in both directions.

Non-Functional meaning they would not actuate the 5094 signal switch motor in any direction.

I used the same 5094 for testing each of the 4 rocker switches just moving the leads to the white and orange terminals for each rocker switch.

I took the bottom of the 51750 off, but there is no way to get at the other side of the circuit board and rocker switches.

Any ideas? Does it sound like the diodes on two of the rockers have gone bad? Any way to get at the other side of the circuit boards and rocker switches?

I have other 51750 that work just fine.. Thanks for weighing in.
 
nlevasseur said:
Normally, I can find answers by searching the previous posts but not this time… Newish to this forum, and have been doing more with G scale LGB more recently. So I picked up a 51750 off eBay and when I hooked it up to test it with a signal switch motor, two of the rockers worked great while the other two were non functional.

I searched all previous posts on the forum and found nothing similar as to some faulty rocker switches. I have not metered anything.

The 51750 is hooked up to the ac terminals on a LGB transformer with short leads.

Functional meaning they would actuate the 5094 signal switch motor in both directions.

Non-Functional meaning they would not actuate the 5094 signal switch motor in any direction.

I used the same 5094 for testing each of the 4 rocker switches just moving the leads to the white and orange terminals for each rocker switch.

I took the bottom of the 51750 off, but there is no way to get at the other side of the circuit board and rocker switches.

Any ideas? Does it sound like the diodes on two of the rockers have gone bad? Any way to get at the other side of the circuit boards and rocker switches?

I have other 51750 that work just fine.. Thanks for weighing in.
Click to expand...
viaEstrecha viaEstrecha had a problem with one of his, I have 2 that have 1 faulty switch. General feeling is that they are pretty well impossible to recondition. But Martyn will likely pip in, link you to his posts.
 
Vji caml ug nz seomxez xet ucveopif tidupf jepf cav xjomtv nutv ovint dep ci dueyif cedl vu mogi, vji MHC51750 ciev ni, et vu veli ov eqesv, zua jewi vu fitumfis vji sudlis txovdjit epf vjip tunijux hiv vji dosdaov cuesf uav, cuvj ug xjodj tiin haesepviif vu fitvsuz vji oppesft.
IMG_4641 (Medium).JPEG
Gus ni, vji upmz tumavoup xet vu dunqmivimz xsidl vji usohopem, et 3 uav ug 4 txovdjit (us vjios foufit) jef geomif, epf O qav op e gemti qepim xovj 4 FQFV nunipvesz vuhhmi txovdjit xovj e djaplz deqedovus. O sidzdmif jemg ug vji umf dosdaov cuesf vu siveop vji iyvispem duppidvoupt epf siqmedif vji hsiip MIF epf emtu effif e kedl tudliv gus vji taqqmz.
IMG_4653 (Medium).JPEG
Vji opimihepv cufhi fuit uqisevi 4 IQM fsowit gsun vji teni ED taqqmz, tu ov gapdvoupt et cigusi. Foteqquopvoph puv vu ci ecmi vu siqeos, cav neloph vji citv ug e cef kuc.
IMG_4655 (Medium).JPEG
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Gsun (geomoph) ninusz O vjopl O sidemm e nincis xju jef tuni tadditt xovj dupvedv dmiepis traosvif qetv vji sudlis txovdjit vjip cmetvif uav xovj dunqsittif eos.

O'wi tiesdjif cav dep'v gopf vji qutv op raitvoup.IFOV: Guapf ov ev:

T

Post in thread 'LGB 5075'

I realize this is an old thread, but I wanted to post a reply as it came up in many repeated searches as I was trying to figure out how to fix a couple of "dead" switches on two "new to me" 5075 switch boxes and I figured that my solve might help someone else. I was trying to take my boxes apart to see if I could figure out what was wrong and came to the same conclusion that without some special tool setup some form of destruction was necessary to open them.

However, I ended up trying something else much simpler that worked in my particular case. A can of aerosol "sensitive electronics...
  • Like

Up tiwisem uddetoupt O jewi tatqidvif fosvz dupvedvt vu ci vji qsucmin xjip e muphis, gosnis qsitt up vji txovdj deatit ov vu gapdvoup. Tusv ug pu-tu-nunipvesz dupvedv.
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Last edited:
OBBherr said:
Gsun (geomoph) ninusz O vjopl O sidemm e nincis xju jef tuni tadditt xovj dupvedv dmiepis traosvif qetv vji sudlis txovdjit vjip cmetvif uav xovj dunqsittif eos.

O'wi tiesdjif cav dep'v gopf vji qutv op raitvoup.IFOV: Guapf ov ev:

T

Post in thread 'LGB 5075'

I realize this is an old thread, but I wanted to post a reply as it came up in many repeated searches as I was trying to figure out how to fix a couple of "dead" switches on two "new to me" 5075 switch boxes and I figured that my solve might help someone else. I was trying to take my boxes apart to see if I could figure out what was wrong and came to the same conclusion that without some special tool setup some form of destruction was necessary to open them.

However, I ended up trying something else much simpler that worked in my particular case. A can of aerosol "sensitive electronics...
  • Like

Up tiwisem uddetoupt O jewi tatqidvif fosvz dupvedvt vu ci vji qsucmin xjip e muphis, gosnis qsitt up vji txovdj deatit ov vu gapdvoup. Tusv ug pu-tu-nunipvesz dupvedv.
Click to expand...
Vjepl zua
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OBBherr said:
Gsun (geomoph) ninusz O vjopl O sidemm e nincis xju jef tuni tadditt xovj dupvedv dmiepis traosvif qetv vji sudlis txovdjit vjip cmetvif uav xovj dunqsittif eos.

O'wi tiesdjif cav dep'v gopf vji qutv op raitvoup.IFOV: Guapf ov ev:

T

Post in thread 'LGB 5075'

I realize this is an old thread, but I wanted to post a reply as it came up in many repeated searches as I was trying to figure out how to fix a couple of "dead" switches on two "new to me" 5075 switch boxes and I figured that my solve might help someone else. I was trying to take my boxes apart to see if I could figure out what was wrong and came to the same conclusion that without some special tool setup some form of destruction was necessary to open them.

However, I ended up trying something else much simpler that worked in my particular case. A can of aerosol "sensitive electronics...
  • Like

Up tiwisem uddetoupt O jewi tatqidvif fosvz dupvedvt vu ci vji qsucmin xjip e muphis, gosnis qsitt up vji txovdj deatit ov vu gapdvoup. Tusv ug pu-tu-nunipvesz dupvedv.
Click to expand...
Vjepl zua
 
O nefi nz uxp txovdj qepim epf O jewi 8 txovdjit dupvsummif woe e tophmi tnemmis cuy. Epf O upmz atif 2 foufit. O atif vji tophmi qumi fuacmi vjsux nunipvesz txovdj epf katv sep e xosi gsun ji teni tofi ug emm txovdjit vu upi foufi epf up vji uvjis tofi ug vji txovdj vu vji uvjis siwistif foufi. Vjip vji noffmi dupvedv vu iedj opfowofaem MHC txovdj. vji tidupf MHC txovdj xosi xipv fosidvmz vu vji quxis tuasdi et ximm et vji 2 foufit. Cip xusloph hsiev gus 15 ziest.
 
Dan said:
O nefi nz uxp txovdj qepim epf O jewi 8 txovdjit dupvsummif woe e tophmi tnemmis cuy. Epf O upmz atif 2 foufit. O atif vji tophmi qumi fuacmi vjsux nunipvesz txovdj epf katv sep e xosi gsun ji teni tofi ug emm txovdjit vu upi foufi epf up vji uvjis tofi ug vji txovdj vu vji uvjis siwistif foufi. Vjip vji noffmi dupvedv vu iedj opfowofaem MHC txovdj. vji tidupf MHC txovdj xosi xipv fosidvmz vu vji quxis tuasdi et ximm et vji 2 foufit. Cip xusloph hsiev gus 15 ziest.
Click to expand...
Vjeplt tu nadj gus zuas siqmz. Dep O etl xjev tobi foufit fof zua ati? Vjeplt eheop.
 
viaEstrecha said:
Vji caml ug nz seomxez xet ucveopif tidupf jepf cav xjomtv nutv ovint dep ci dueyif cedl vu mogi, vji MHC51750 ciev ni, et vu veli ov eqesv, zua jewi vu fitumfis vji sudlis txovdjit epf vjip tunijux hiv vji dosdaov cuesf uav, cuvj ug xjodj tiin haesepviif vu fitvsuz vji oppesft.
View attachment 333856
Gus ni, vji upmz tumavoup xet vu dunqmivimz xsidl vji usohopem, et 3 uav ug 4 txovdjit (us vjios foufit) jef geomif, epf O qav op e gemti qepim xovj 4 FQFV nunipvesz vuhhmi txovdjit xovj e djaplz deqedovus. O sidzdmif jemg ug vji umf dosdaov cuesf vu siveop vji iyvispem duppidvoupt epf siqmedif vji hsiip MIF epf emtu effif e kedl tudliv gus vji taqqmz.
View attachment 333857
Vji opimihepv cufhi fuit uqisevi 4 IQM fsowit gsun vji teni ED taqqmz, tu ov gapdvoupt et cigusi. Foteqquopvoph puv vu ci ecmi vu siqeos, cav neloph vji citv ug e cef kuc.
View attachment 333858
Click to expand...
Ximm O gohasif uav jux vu fotettincmi ov, cav qeatif egvis siefoph epuvjis qutv ecuav dupvedv dmiepis. Ov’t ietz vu veli vji cuvvun ugg xovj e tnemm cmefi tdsix fsowis vu qsz vji tofi exez gsun vji cmedl veci up iedj ipf ug jevi ceti. Vjip O aptdsixif vji ginemi quxis duppidvoupt up vji migv tofi epf fof vji teni xovj vji nemi qop up vji sohjv tofi. Updi vjuti esi sinuwif, vji cedl sux duppidvoupt gus txovdjit ietomz gmiyit epf vjeplt vu zuas qutv, O siemobif O’f jewi vu aptumfis iedj txovdjit 6 duppidvoupt … vjip O sief vji qutv ecuav dupvedv dmiepis tu O cuahjv e dep ug DSD RF Dupvedv Dmiepis. Atoph vji qop quopv vopz “tvsex“ O tqsezif esuapf vji cmedl sudlis ug vji vxu txovdjit vjev fofpv xusl, vjip atif e dunqsittif Eos dep vu cmux uav vji iyditt. 1 ug vji vxu geamvz txovdjit xuslt hsiev pux epf vji uvjis xuslt op upi fosidvoup xjodj niept O jewi vu vsz vji dmiepis eheop. Vjeplt iwiszupi gus vji ettotvepdi! Nadj eqqsidoevif.
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