Hi all. I'm working on a Samsung TV Power supply board (BN044-00501a) and found one of the SB315 diodes on the cold side to be shorted. I removed it and ordered a 3A 20V PRV replacement as the 3A 15V PRV is difficult to order quickly. The TV sprung to life. After a few seconds, it went dead again...same symptoms. Did diode check again and the replacement diode had blown again. This diode is in parallel with 3 other SB315's. I am now seeing in places that "SB315 = SB3150". Is this true?
Is the SB315 on the PSU actually 3A 150V PRV and NOT rated at 15V? If it is actually supposed to be 15V and I've more or less replaced it with the 20V (I know I'm gonna get shot for that), then what can be causing the same diode to blow in the circuit? Had any of the other 3 diodes blown I would have assumed a fault further down the circuit, but since it's the replacement that blew, I'm thinking I may have made a mistake with interpreting the diode PRV.
All input will be helpful. Any pieces of missing info, please let me know. Thank you.
Is the SB315 on the PSU actually 3A 150V PRV and NOT rated at 15V? If it is actually supposed to be 15V and I've more or less replaced it with the 20V (I know I'm gonna get shot for that), then what can be causing the same diode to blow in the circuit? Had any of the other 3 diodes blown I would have assumed a fault further down the circuit, but since it's the replacement that blew, I'm thinking I may have made a mistake with interpreting the diode PRV.
All input will be helpful. Any pieces of missing info, please let me know. Thank you.
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