Hi I have and (DPS-168JP A) Power Supply / LED Board LC-60LE600U with no backlights I just need two resistors r7204/r7203 what size are they mine blow up and cannot be read I try so many different resistors and all they catch on fire please see the picture I have circle them thanks
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(DPS-168JP A) Power Supply / LED Board LC-60LE600U
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Re: (DPS-168JP A) Power Supply / LED Board LC-60LE600U
Check that you don't have shorted diodes, if they are ok, you could have shorted led's in the panel, there seem to be 4 seperate led strings I suspect you have a problem with 2 of them, line 3 & 4Last edited by R_J; 05-12-2019, 07:42 PM.
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Re: (DPS-168JP A) Power Supply / LED Board LC-60LE600U
T7601 transformer drives the 4 led strings, The positive of all 4 strings are connected together, the negative of all 4 strings are connected together AFTER each resistor, R7203, 7204,7205 & 7206. If there was a fault on the power supply, all 4 resistors should burn up.
That only leaves the led strings themselves, They can't be the correct strings
Also R7206 & 7205 are 68Ω , R7204 & R7203 are 100Ω, that would indicate to me the two sets of led strings are different.
led1 & led2 are not the same as led3 & led4
I checked a video and I can see each strip has 4 wires, I suspect there are more leds on one side of the strip than the other and led1 and led3 connect to one strip and led2 and led4 connect to the other strip.
Is this what the plug looks like going to to the leds in the panel? do you have 8 wires?Last edited by R_J; 05-12-2019, 10:12 PM.
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Re: (DPS-168JP A) Power Supply / LED Board LC-60LE600U
Each one of the resistor is connected in parallel with the Upper LED power supply filter cap.
If you look at the bottom side of the board you will see that
R7203 in parallel with C7204 22uf 200V
R7204 in parallel with C7205 22uf 200V
R7205 in parallel with C7206 22uf 200V
R7206 in parallel with C7207 22uf 200V
The two LED power supplies in this are stacked together, one is generated by T7601, the second power supply is the Boost converter generated by L7201 and Q7201.
All 4 Cathode returns are tied together return to via Q7202, and current sensing resistors.
So those resistors cannot be that low of the resistance, more like the 68K and 100K are to be the correct value. Those caps are rated at 200V so the I expect the Voltage between the two legs of those cap will be in 150V range.
You said the resistors blew up, what are the resistance reading of the original resistors?
https://www.shopjimmy.com/sharp-runt...led-board.htm#
Pictures provided by shopjimmy.Last edited by budm; 05-12-2019, 10:50 PM.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:
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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=24809
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