Re: Samsung Syncmaster
Fixed it, thank you!
The voltage stayed at 13.x, even with new caps and an new TM-09210.
The new TM-09210 had about 986 Ohms resistance on the secondary instead of 1.4k but the backlight is back so i wont complain.
Since i switched the caps & the TM at the same time i cant be 100%, but i'd guess the TM was bad.
mojo_tsi
New Member
Last Activity: 10-09-2018, 08:29 AM
Joined: 09-16-2018
Location: vienna
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Re: Samsung Syncmaster
Just measured the voltages on the low voltage side(main board) 5V rails where at about 5.1V, 14.5V was only at 13.28V.
Maybe this is another P2770HD where the TM-09210 died?
The coil resistance was okay, and there where no discolorations but i guess i'll order the transformer and try.Leave a comment:
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Re: Samsung Syncmaster
IC wise i found three on the underside of the power PCB.
Biggest one reads: SEM2105 1026...Leave a comment:
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Re: Samsung Syncmaster
I thought i had the model in the thread title.
Model: P2770HD Type No.: EM27TS
Model Code: LS27EMDKU/EN
There is a Top and a Bottom CCFL assembly, each containing 2(?) Lamps
The CCFL's both shut down after 1s no matter wich one assembly i disconnected, so no new information there.
The PSU-Board BN from the service manual i found online is BN44-00322A, found a pic of a spare board for sale that also had the discoloration around D109 so i think the BN number is correct....Leave a comment:
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Samsung Syncmaster
Hi there,
i am currently fiddling with a samsung monitor/tv combo.
Backlight cuts out after about a second, picture seems fine otherwise.
1. I touched up some suspect solder joints especially at D109 wich seemed to be quite toasty give the color of the PCB
2.Tested some caps in circuit and desoldered some but ballpark numbers seemed okay(device used was the M-Tester)
3.Measured resistance on the inverter transformer, very low ohm on the primary and about 1.3k ohm on the secondaries.
4. No idea what to do... -
Re: New Members - please post your introductions here
Hi,
i got a 1 second to black samsung P2770HD hopefully it was just a cold solder joint at D109 wich got a bit toasty, caps seem fine, no discolorations other than D109 and the one transformer leg close to it.
best regards,
mojoLeave a comment:
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