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Old 03-03-2021, 07:52 PM   #1
Plane Nuts
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Default LC-52D64U (Sharp Aquos) component ID

I picked up a Sony LC-52D64U (Sharp Aquos 52 in) TV that will not turn on, while testing Main P/S board DPS-304BP-1 I accidently shorted out a resistor and unfortunately it does not have the lines on it so I don't know its resistance. it is R7641 in the attached drawing and have attached pictures of what is left in case someone familiar with these resistors can identify it or has one of these boards and can check what is it. would like to know resistance and what type it is if it is special, and will a regular resistor work.

After looking at the pictures on the computer and not my phone looks like 0.1 ohms does everyone agree?
Attached Images
File Type: jpg resistor pic1.jpg (887.2 KB, 10 views)
File Type: jpg resistor pic2.jpg (1.02 MB, 9 views)
Attached Files
File Type: pdf delta_lcd_power_dps-304bp.pdf (813.8 KB, 6 views)

Last edited by Plane Nuts; 03-03-2021 at 07:56 PM.. Reason: new info
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Old 03-03-2021, 07:55 PM   #2
R_J
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Default Re: LC-52D64U (Sharp Aquos) component ID

Looks like 0.1Ω, .5 watt fusible flame proof, If the resistor is open, I suspect Q7601, Q7602 are also shorted

Last edited by R_J; 03-03-2021 at 08:01 PM..
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Old 03-06-2021, 07:14 PM   #3
Plane Nuts
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Default Re: LC-52D64U (Sharp Aquos) component ID

Thank-you R_J,

I Replaced the part, and luckily it did not blow anything else. I tracked the main issue with the TV not turning on to a shorted mofset P/N K3706, I put in a P/N 13N50CF, and at that point the TV would try to turn on but would shut down after about 5 seconds. After a few tries it shorted out again. I am wondering if it is because the MOSFET specs was too far off what is supposed to be there or there is something else loading it to the point of shorting out. The only K3706 I have found are from china and would take weeks to get here, any common equivalent available? or what to look for to find a good equivalent? What can I look for while I am waiting for parts to help identify on why it shorts out. NOte that I also found Q7505 (P/N J655) next to it also shorted out.
I have attached pictures of the board, note the problem mofset is removed
Attached Images
File Type: jpg inverter front.jpg (987.7 KB, 4 views)
File Type: jpg inverter back.jpg (1.19 MB, 5 views)

Last edited by Plane Nuts; 03-06-2021 at 07:43 PM.. Reason: additional info
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Old 03-06-2021, 08:53 PM   #4
R_J
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Default Re: LC-52D64U (Sharp Aquos) component ID

I thought you were still repairing the power supply, I see you are now repairing the backlight inverter.
If the mosfet was shorted D or S to Gate, then the drive components or drive ic is likely bad as well.
Q7505 might have been damaged when Q7506 shorted.

Last edited by R_J; 03-06-2021 at 09:08 PM..
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Old 03-07-2021, 10:15 AM   #5
Plane Nuts
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Default Re: LC-52D64U (Sharp Aquos) component ID

Yes both Q7506A and Q7505A were both shorted out between the three Pins (S, D and Gate) so what would cause it to short out like that?
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