Re: MP 42HC56 SINOTEC 42 lcd
Sorry... I thought PSon is there, but 320V on the filter caps (240V rectified) = no PFC
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Re: MP 42HC56 SINOTEC 42 lcd
Only one filter cap C533 220uf 450vdc.
VPFC is used for running the 24V and the standby power supply, when in standby mode, the standby power supply will run on 330VDC (no boosted Voltage yet until PS-ON is present from the main board).
What DCV do you have on IC N501 VCC pin 2 and GND pin 1? C513 is the startup/running cap for the IC N501.
The PFC and the 24V will not function until the STANDBY power supply section works first.Last edited by budm; 12-01-2015, 08:10 PM.Leave a comment:
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Re: MP 42HC56 SINOTEC 42 lcd
Hi
320v dc it's actualy have 2 filter caps,
one for the 24v supply and a 2nd for the standby..
i have attached a bottom pcb view..
I highly suspect that fps icAttached FilesLeave a comment:
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Re: MP 42HC56 SINOTEC 42 lcd
What DCV do you get between the two legs of the main filter cap in the primary side?
BTW, so no DCV on any one of the connector in the secondary side of the circuit at all?Leave a comment:
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MP 42HC56 SINOTEC 42 lcd
Good evening all.
Anyone came across this this PSU board ?
No bad caps (wow) but dead.
all switch mode transistors test 100%
had 1 dogey cap .
and it is not powering up , not even the separate psu on the board that from tracing seem to be the standby psu which in turn switch on the rest of the main board.
i have my suspicions on ic :n501 (Q110 wich is a FPS chip from fairchild semi)
ordered and waiting from RS components..
BUT would like some thoughts around it..Attached Files -
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