Hi, I have a RCA LED32B30RQ and the only voltage I am getting is 5v sb. The 5v, 12v and 24v are dead.
Thanks in advance for the help.
Thanks in advance for the help.
Attached Files
-
Last edited by pop70458; 06-11-2015, 05:45 AM. -
Re: RCA LED32B30RQ only standby voltage
use a 1K resistor from PS_ON to 5V Standby and see if the 12v and 24v are there -
Re: RCA LED32B30RQ only standby voltage
Measure PSON pin after you push the powet button.Comment
-
Re: RCA LED32B30RQ only standby voltage
I jumped it with a resistor and all of the voltages came up. The tv has no 24v, I read the board wrong they are 5v also.Comment
-
Re: RCA LED32B30RQ only standby voltage
Do as mmartell suggested and check PS_ON pinComment
-
Re: RCA LED32B30RQ only standby voltage
"I jumped it with a resistor and all of the voltages came up. The tv has no 24v,"
So ALL the voltages come up but not the 24VDC? How about the 12V?
All the Voltages on this always on power supply is generated by the same power transformer, but the sub Voltages are fed through the electronics switches that are turned on by the PS-ON signal.
The main SMPS is fine.Last edited by budm; 06-12-2015, 08:35 AM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
-
Re: RCA LED32B30RQ only standby voltage
The board doesn't have a 24v section, I made a mistake reading the board.Comment
-
Re: RCA LED32B30RQ only standby voltage
Geez am I the only one who is confused ? I think you are saying now that you have all the voltages so what exactly is the problem here ?Comment
-
Re: RCA LED32B30RQ only standby voltage
When i jumped it with a 1k resistor the voltages came up but it wouldn't power on. When i press the the power button i get no voltage on ps on.Last edited by pop70458; 06-13-2015, 08:44 PM.Comment
-
Re: RCA LED32B30RQ only standby voltage
Defective Main Board is my suggestionComment
-
Re: RCA LED32B30RQ only standby voltage
I concur with Andrew.Comment
-
This is my first attempt at troubleshooting a board like this, I know I could just buy a new board but I'm curious to figure out how this works. I've been testing different components in the evenings this week and I think the problem is with the IC failing to start up for some reason. When the board is plugged in there is no standby voltage.
Then today it randomly sprung to life like a zombie but shortly died thereafter. I have no idea why it would have done that and its the first time I've seen it running. I discharged capacitors on the board last night, then it was sitting today.... -
I have no standby indicator light and no light on the optical port. I checked the standby voltage on the two mosfets in the top left and they both read 30mV. I checked the fuse and it has continuity. I also checked the voltage on the two large 450v caps they both read 153v. All of these voltages are the same with and without the main board connected as well as with backlights connected/disconnected.
Nothing looks obvious like a burned ceramic disc cap or bulged electrolytic. No burned resistors, diodes, or anything like that.... -
Hello,
I have a problem with this TV, the standby voltage is not present. I have checked the components around the IC fsq510's area and they seem to work, also replaced this IC but the problem persists.
These are the voltages in some pins of IC fsq510:
Vcc=18v
D=320v
Vstr=154v
Unfortunately, I couldn't find the schematic
What else could I check?
Is it possible to provide standby voltage from an external source to allow the TV to turn on?
Thank you​... -
An Asus GL503GE laptop arrived that had had a screw dropped on the motherboard while the battery was connected. This resulted in a physical damage to the 3.3v / 5v voltage controller RT6575DGQW (pu28 on schematic, page 40). Additionally, the trace to pin 12 (VIN 19v supply) was burnt.
Replaced the RT6575DGQW with a new one, repaired the damaged trace. Only getting 0.7V instead of the expected 3.3v standby voltage (3V_S5 on schematic).
Replaced the AON7408 PQ60 mosfet from a donor board as resistance was low on the gate (I did not write this value down, as I optimistically... -
Hello,
I am trying to re-purpose this power supply that I saved years ago from a tv with a cracked screen for a monitor but that is not really that relevent at the moment. I do not recall which tv but a google search looks like it is from Wharfedale LTF37K1.
You may notice I made some alterations moving some components to the top and some wires which are from a 5v regulator I fitted to the 12v output as the monitor requires 5v. The standby was already at fault from the beginning, it has nothing to do with the alterations...
Years ago it had some bulging caps...
Comment