I have a Samsung LN32A450C1D with just the red light on and does nothing pushing the power button. I thought ok must be bad caps so looking at it all the caps look great so I pulled out the 7 big ones and checked with my ESR70 and all were perfect. I did check voltages and almost nothing on all of them. Fuse is good and no signs of anything hot or cold solder joints. Not sure what to check next.
Announcement
Collapse
No announcement yet.
Samsung LN32A450C1D Red light
Collapse
X
-
Re: Samsung LN32A450C1D Red light
any standby voltage?and for starters ,get rid of that brown glue around some of the components,it will conduct more as it gets older and cause problemsLast edited by multimeter; 03-14-2014, 12:34 PM.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!
----------------------------------------------
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!
-
Re: Samsung LN32A450C1D Red light
ok,cant quite see them,5.3v is most likely the stb voltage,the 12v for the mainboard,.
disconnect main board loom,recheck voltages on the 5.3v rails on the power supply,do these re-appear?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!
----------------------------------------------
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
-
Re: Samsung LN32A450C1D Red light
Think this is the schematic:
5.3V is generated by LM2576-ADJ (ICM856), a buck converter IC, from 24V rail.
Check-
pin 1: input voltage, around 24V.
pin 2: output switch node, approx 5.3V
pin 4: adjust, approx 1.25V
Also check pin 2 to ground for shorts, could be bad DM857
If input voltage present, but no output and DM857 not shorted suspect bad ICM856Please 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
-
Re: Samsung LN32A450C1D Red light
Originally posted by CraigR View Posttom66, you need to dumb it down a bit for me I have noware near your smarts. I can not get a prob in to check DM857 and I do not see ICM856 unless it's on the bottom of the board. Should I pull DM857 out of circuit and test??
datasheet here www.hqew.net/datasheet/LM2576$2dADJ-datasheet-pdf-download-209961.htmlLast edited by multimeter; 03-14-2014, 01:42 PM.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!
----------------------------------------------
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
-
Re: Samsung LN32A450C1D Red light
ICM856 will be mounted on heatsink near main board output connector.
DM857 will be near it.
Whenever testing a voltage is suggested but only a single point is given like above the measurement is to be taken with the red probe on the pin and black probe on the ground like the chassis of the TV.
Diodes are tested on the diode mode of your multimeter in both directions, note the readings you get.Last edited by tom66; 03-14-2014, 01:43 PM.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
-
Re: Samsung LN32A450C1D Red light
Pin testing may be easier if you solder wires to the pads underneath and test those instead.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
-
Re: Samsung LN32A450C1D Red light
Originally posted by CraigR View PostThe 3 legs I can reach with my probe show only in the mV range.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!
----------------------------------------------
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
-
Re: Samsung LN32A450C1D Red light
Originally posted by CraigR View PostOn DM857 I have 1v on the center leg and on MV on the other 2 legs.
its a 3 legged duel diode
diode test on meter
measure pins 1-2 reading?
measure pins 2-1 reading?
measure pins 2-3 reading?
measure pins 3-2 reading?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!
----------------------------------------------
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
-
Re: Samsung LN32A450C1D Red light
diode seems OK so ICM856 is the prime suspect, but need those voltages on 1,2 and 4 to be sure.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
Comment