Hello,
I know this has been discussed several times in this forum; but usually people tend to replace the whole board; while I'm trying to figure out what's wrong with it & replace it as a last resort. As I'm trying to learn while fixing this TV.
Here's what I have so far; please feel free to correct me if I'm wrong:
My issue is not in the power board. Simply because when I disconnect the main board the LED’s come on; which I believe means that there’s a short somewhere in the main board.
So here’s what I’ve found so far:
1. LED’s come on when I disconnect the MB.
2. tested the voltages out of the PS board & they all check.
3. F11 (fuse) in T-con board is good (continuity) but it has zero voltage.
4. PANEL_VCC is dead in the MB; it should read 13v (not sure)
5. PANEL_VCC is the output of protection IC IC210.
6. IC210 has good input to it coming from the PS board via the 20 pin connector.
7. IC210 EN (Enable) pin is dead; as if whatever (I think should be the MCU) turning it on so it can supply voltage to the panel is not.
8. IC210 is good; I applied 5v to the EN pin & it turned on; which delivered the 13v to the T-con board.
9. The TV is responsive to remote; I mean when you press buttons in the remote the stand by LED blinks; not sure if this acknowledgement is coming from the MCU or a simple IR circuitry in the IR transponder board.
I cannot find schematics for the main board so I can troubleshoot it further; any help would be appreciated.
I know this has been discussed several times in this forum; but usually people tend to replace the whole board; while I'm trying to figure out what's wrong with it & replace it as a last resort. As I'm trying to learn while fixing this TV.
Here's what I have so far; please feel free to correct me if I'm wrong:
My issue is not in the power board. Simply because when I disconnect the main board the LED’s come on; which I believe means that there’s a short somewhere in the main board.
So here’s what I’ve found so far:
1. LED’s come on when I disconnect the MB.
2. tested the voltages out of the PS board & they all check.
3. F11 (fuse) in T-con board is good (continuity) but it has zero voltage.
4. PANEL_VCC is dead in the MB; it should read 13v (not sure)
5. PANEL_VCC is the output of protection IC IC210.
6. IC210 has good input to it coming from the PS board via the 20 pin connector.
7. IC210 EN (Enable) pin is dead; as if whatever (I think should be the MCU) turning it on so it can supply voltage to the panel is not.
8. IC210 is good; I applied 5v to the EN pin & it turned on; which delivered the 13v to the T-con board.
9. The TV is responsive to remote; I mean when you press buttons in the remote the stand by LED blinks; not sure if this acknowledgement is coming from the MCU or a simple IR circuitry in the IR transponder board.
I cannot find schematics for the main board so I can troubleshoot it further; any help would be appreciated.
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