Re: DPS285BP 5v standby transformer blown
I have a similar issue on a DPS-162KP-1A power supply board on a sharp TV. I found fuse F7001, resistor R7900, capacitor C7901, IC7903 blown. Cannot find any further faulty components but when I test the TV with a serial bulb circuit to check for short circuits, the bulb is lighting which means I still have a short circuit somewhere. Any help what can I check further please?
Clifton11283
Member
Last Activity: 10-27-2023, 02:28 PM
Joined: 08-22-2022
Location: Qormi
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Re: TV Sharp AQUOS LC-60LE635E TV not power ON
Hi,
I have just found low resistance on capacitor c7901 and instead of 100pf it's capacitance is 30pf. Could it be this js the main problem shorting IC 7903 and R7900?
ThanksLeave a comment:
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Re: TV Sharp AQUOS LC-60LE635E TV not power ON
Hi,
Please find attached a picture of the other side of the PCB. Attached please also find the circuit of the area where I am having issues maybe it helps you in helping me identify where the problem is.
Thanks...Leave a comment:
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Re: TV Sharp AQUOS LC-60LE635E TV not power ON
During the weekend will try to do this test and get back to you.Leave a comment:
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Re: TV Sharp AQUOS LC-60LE635E TV not power ON
Thanks!!Leave a comment:
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Re: TV Sharp AQUOS LC-60LE635E TV not power ON
D7905 when tested with a multimeter looks fine. The black stain visible on the picture is due the spark done by R7900.
Thanks
CliftonLeave a comment:
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Re: TV Sharp AQUOS LC-60LE635E TV not power ON
Please find attached a pictures of the power supply board.
Thanks again for all your help....Leave a comment:
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Re: TV Sharp AQUOS LC-60LE635E TV not power ON
Hi,
Thanks for your reply.
Diode is soldered correctly. The only mistake I did to be honest is that resistor R7900 was 1/4W instead of 1/2W.
CliftonLeave a comment:
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Re: TV Sharp AQUOS LC-60LE635E TV not power ON
Hi,
I also have a Sharp LC-60LE63E TV with Power supply board DPS-162KP B. Set was not switching on and when opened found R7900, IC7903 (physically cracked) and D7908 burnt. All parts have been replaced but R7900 and IC7903 were blown again (with a large spark) when supply has been switched on. Any idea what the problem might be please?
Thanks
Clifton11283Leave a comment:
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Re: New Members - please post your introductions here
Hi all,
I studied electronics at the Fellenberg Training Centre in Malta and then continued other courses with BTEC and City and Guilds. I love repairing electronics devices even though this is not my full time job.
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