Neon C3298DVB stuck in standby
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Re: Neon C3298DVB stuck in standby
I took a reading on the big cap & got 230 on the ac/dc meter & 0 when switched off..the big heat shield also measured that?..is it supposed 2 measure that..thxComment
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Re: Neon C3298DVB stuck in standby
primary side heatsinks will normally be at line voltage so 230v will be on the heatsink,but your large filter cap should be around 320-340v if the pfc front end is working when tv is powerd on.
disconnect main board,jumper 5v to on/off pin,do other voltages come up?,the 12v to main board,and 24v to inverter?something i think on the main board is putting the psu in to protection.fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: Neon C3298DVB stuck in standby
primary side heatsinks will normally be at line voltage so 230v will be on the heatsink,but your large filter cap should be around 320-340v if the pfc front end is working when tv is powerd on.
disconnect main board,jumper 5v to on/off pin,do other voltages come up?,the 12v to main board,and 24v to inverter?something i think on the main board is putting the psu in to protection.Comment
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Re: Neon C3298DVB stuck in standby
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Re: Neon C3298DVB stuck in standby
check the fuse ive marked in red,this problem is either a corrupt new eeprom flash that you put in,or the crystal to the cpu has failed or the cpu has failed both of these are under the large sheild ,your power supply seems fine.
check that fuse
if fuse good,take resistance reading on the connector pins of the mainboard(the one where the power comes from the psu),just the ones that are marked with a voltage,the readings should be very high resistance,if they are low ie about 30 ish ohms,then it points to a short on that rail which will need investigating.
if all good then you will need to take off that large sheild and look up the datasheet for the cpu ic,confirm what the voltage into the cpu is and what pin it is,and then test that pin to see if the correct voltage is there,if you dont have a scope then you wont be able to test the crystal,it should show a steady sine wave on a scope.fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: Neon C3298DVB stuck in standby
also,now you have everything disconnected,plug connectors in one at a time,whilst jumping 5v to on,and monitor the voltages if they dissapear again then what ever you plugged in may have a short on it,im positive more or less its the main board thoughfixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: Neon C3298DVB stuck in standby
Took the shield off & cant seem to find any info on the ic..thxComment
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Re: Neon C3298DVB stuck in standby
for resistance /fuse testing power off,either on 200 ohm range or diode test function for continuity.
you will need to remove the heat sink on the cpu chip,should just twist off gently,you will need to get some thermal bonding glue to put back on ,both surfaces must be spotless and dry,use isopropynal alcohol.
the ic will have its part number under the heatsink.fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: Neon C3298DVB stuck in standby
on u6 the flash chip you replaced,did you not use flux(no clean)?,those pins look a bit shaky,id have a check for continuity on each pin,find a nearby solder pad that connects to each pin and check they have continuity,do for every pin.pin 7 dosent look like its on its pad properly,or its the picture,not sure.Last edited by multimeter; 08-18-2012, 08:21 AM.fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: Neon C3298DVB stuck in standby
on u6 the flash chip you replaced,did you not use flux(no clean)?,those pins look a bit shaky,id have a check for continuity on each pin,find a nearby solder pad that connects to each pin and check they have continuity,do for every pin.pin 7 dosent look like its on its pad properly,or its the picture,not sure.
5.09v
5.09v
5.09v
5.09v
12.07v
12.07v
on the main power pins from the mainboard
I used non clean flux for the eeprom..i looked over chip with jewellers eye n they look fine..it looks better under scope..gonna do them other readings now..thxComment
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Re: Neon C3298DVB stuck in standby
Hey up fella..thx again for sticking by me..with the jumper pin in place & everything connected up & switched on i get
5.09v
5.09v
5.09v
5.09v
12.07v
12.07v
on the main power pins from the mainboard
I used non clean flux for the eeprom..i looked over chip with jewellers eye n they look fine..it looks better under scope..gonna do them other readings now..thxComment
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Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Neon C3298DVB stuck in standby
on u6 the flash chip you replaced,did you not use flux(no clean)?,those pins look a bit shaky,id have a check for continuity on each pin,find a nearby solder pad that connects to each pin and check they have continuity,do for every pin.pin 7 dosent look like its on its pad properly,or its the picture,not sure.
MSD106CL-LF-Z1
A6MFN29J
0933BComment
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Re: Neon C3298DVB stuck in standby
ok,cant find any info on this chip no datasheet,would have been good to find VCC to at least see if the chip is getting its voltage,if you have a scope ,we could see if the crystal is working,it should show a stable sine wave.very rare these fail though.
there are a couple of voltage regulators on this board,prefixed "bm" you could check those and see if they are working,but if they work through the main cpu they may not activate until the cpu sends the correct signal.
the voltages you had taken are correct and within spec,you can rule out the psu.
hopefullly someone might pipe in and show a link to a datasheet for the chip.but i cant find one.
if no joy i would keep an eye out for a mainboard on ebay or elsewhere you may get luckyfixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: Neon C3298DVB stuck in standby
by the way did you follow the steps in post#46 about resistance testing on the disconnected main board?if you havent...
set your meter to 20k,black probe to chassis screw,red probe to each individual line voltage pin (no need to do the ground pins),coming into the main board from the psu,the readings should be very high resistance anything around 30ohms indicates a short on that rail.
the main board has a short somewhere that is shutting the psu down,confirmed by jumping the pins as you did with nothing connected,if you find the rail thats shorted,you can trace along and check components along the trace thats affected,(leakseeker would be good for this)fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!
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please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!Comment
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Re: Neon C3298DVB stuck in standby
Took 20k setting readings on the power in pins & the 2 5vins pins were a reading of 0.28..the others were high..this was done with nothing plugged into the mainboard nothing jumpered & not switched on..thxComment
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Re: Neon C3298DVB stuck in standby
All the vdos give correct voltages with only the jumper pin inplaceLast edited by sienoki; 08-18-2012, 02:05 PM.Comment
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Re: Neon C3298DVB stuck in standby
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