Neon C3298DVB stuck in standby

[sienoki]

Re: Neon C3298DVB stuck in standby

A pic ok underside psu

Heres 1 with wires attached..not sure which 1s 2 put a jumper on..thx

[sienoki]

Re: Neon C3298DVB stuck in standby

Heres 1 with wires attached..not sure which 1s 2 put a jumper on..thx

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..thx

[multimeter]

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.

[sienoki]

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.

I jumpered the 5v from the stnby pin to on/off pin & still no other voltages..i will get some pics off main board both sides when ive some time off work..thx

[sienoki]

Re: Neon C3298DVB stuck in standby

I jumpered the 5v from the stnby pin to on/off pin & still no other voltages..i will get some pics off main board both sides when ive some time off work..thx

I jumped them pins with nowt connected 2 mainboard & 12v/24v appeared..sorry 4 not doing correct 1st time..some pics of mainboard..if you need underside let me know..theres no smd devices on the underside..thx

[multimeter]

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.

[multimeter]

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 though

[sienoki]

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 though

Fuse tested ok..do i black probe screw chassis n red probe power i pins on mainboard on continuity setting?
Took the shield off & cant seem to find any info on the ic..thx

[multimeter]

Re: Neon C3298DVB stuck in standby

Fuse tested ok..do i black probe screw chassis n red probe power i pins on mainboard on continuity setting?
Took the shield off & cant seem to find any info on the ic..thx

for dc voltage testing with power on,dc setting 20v 0n multimeter,black on chassis screw,red on individual out pins on connector.

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.

[multimeter]

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.

[sienoki]

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.

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..thx

[sienoki]

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..thx

Cant get that heat sink off its stuck solid

[sienoki]

Re: Neon C3298DVB stuck in standby

Cant get that heat sink off its stuck solid

I dont think this board is repairable & it dont look like theres 1 about at the moment..the screen is a samsung LTA320AP02..will this screen be compatible with most 32" lcds?

[tom66]

Re: Neon C3298DVB stuck in standby

I dont think this board is repairable & it dont look like theres 1 about at the moment..the screen is a samsung LTA320AP02..will this screen be compatible with most 32" lcds?

Only with TVs using Samsung panels.

[sienoki]

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.

Got the heatsink off
MSD106CL-LF-Z1
A6MFN29J
0933B

[multimeter]

Re: Neon C3298DVB stuck in standby

Got the heatsink off
MSD106CL-LF-Z1
A6MFN29J
0933B

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 lucky

[multimeter]

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)

[sienoki]

Re: Neon C3298DVB stuck in standby

Fuse tested ok..do i black probe screw chassis n red probe power i pins on mainboard on continuity setting?
Took the shield off & cant seem to find any info on the ic..thx

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..thx

[sienoki]

Re: Neon C3298DVB stuck in standby

I jumped them pins with nowt connected 2 mainboard & 12v/24v appeared..sorry 4 not doing correct 1st time..some pics of mainboard..if you need underside let me know..theres no smd devices on the underside..thx

Took readings of the vdo,s in pic 3 post45 the 1s closest to the power pins & only got the correct voltages with the jumper in..so can i rule them 4 vdos out?
All the vdos give correct voltages with only the jumper pin inplace

[sienoki]

Re: Neon C3298DVB stuck in standby

Took readings of the vdo,s in pic 3 post45 the 1s closest to the power pins & only got the correct voltages with the jumper in..so can i rule them 4 vdos out?
All the vdos give correct voltages with only the jumper pin inplace

So could the fault perhaps be something with the 2 5vins with only having 0.28..so something on them rails?https://www.badcaps.net/forum/attach...6&d=1345298168