Hi everyone,
I just fixed a BN44-00192A power supply board for a Samsung 32 inch LCD TV in great part relying upon the collective wisdom of this forum, so thanks very much!
In my case, the fusible resistor RM801 was blown. This is the fusible resistor that connects and protects the primary line upconvert circuit from a short in the main switching supply circuit.
I have not been able to find a source for a suitable replacement for RM801, which is supposed to be a 0.22 ohm, 1W fusible resistor. Digikey has a listing for a Yageo part with these specs but no stock and a 5000 piece minimum. Bourns has a line of fusible resistors, but they don't go below 4.7 ohm.
So, can anyone point me to a supplier for a suitable RM801 replacement? Or does anyone have a spare (or two) they would be willing to share at cost? (I hope I am not breaking forum rules here. I don't think badcaps sells these.) Please help guys, you have to save me from this:
(See attached image file.)
Yes, that is 5 x 1.0 ohm 0.25 W regular resistors in parallel. Ugly, but the power supply works.
This fusible resistor seems to be a common replacement part in many of these Samsung LCD TV power supply boards, so I expect I am not the only person with this question.
A few comments on this repair for the record:
1) There were a few bad caps, but they probably didn't cause the failure.
2) All the glue was brown and was definitely traced/burnt in the vicinity of RM801 and the nearby small blue cap CM810. I believe this was the cause for the complete failure. I removed all of the glue on board. Fortunately no damage to the circuit board in this case.
3) Cleaning up the glue, replacing RM801 and a few of the cold side large caps and the TV is working again. There were no blown semiconductors or other components.
(Note that I originally posted this request in another thread, but decided it needed more visibility, so I made a new thread. My apologies for double posting it, but I need an answer soon if there is one out there.)
I just fixed a BN44-00192A power supply board for a Samsung 32 inch LCD TV in great part relying upon the collective wisdom of this forum, so thanks very much!
In my case, the fusible resistor RM801 was blown. This is the fusible resistor that connects and protects the primary line upconvert circuit from a short in the main switching supply circuit.
I have not been able to find a source for a suitable replacement for RM801, which is supposed to be a 0.22 ohm, 1W fusible resistor. Digikey has a listing for a Yageo part with these specs but no stock and a 5000 piece minimum. Bourns has a line of fusible resistors, but they don't go below 4.7 ohm.
So, can anyone point me to a supplier for a suitable RM801 replacement? Or does anyone have a spare (or two) they would be willing to share at cost? (I hope I am not breaking forum rules here. I don't think badcaps sells these.) Please help guys, you have to save me from this:
(See attached image file.)
Yes, that is 5 x 1.0 ohm 0.25 W regular resistors in parallel. Ugly, but the power supply works.
This fusible resistor seems to be a common replacement part in many of these Samsung LCD TV power supply boards, so I expect I am not the only person with this question.
A few comments on this repair for the record:
1) There were a few bad caps, but they probably didn't cause the failure.
2) All the glue was brown and was definitely traced/burnt in the vicinity of RM801 and the nearby small blue cap CM810. I believe this was the cause for the complete failure. I removed all of the glue on board. Fortunately no damage to the circuit board in this case.
3) Cleaning up the glue, replacing RM801 and a few of the cold side large caps and the TV is working again. There were no blown semiconductors or other components.
(Note that I originally posted this request in another thread, but decided it needed more visibility, so I made a new thread. My apologies for double posting it, but I need an answer soon if there is one out there.)
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