Samsung LNT4669FX/XXA
Power Supply IP-321135A BN44-00166C 380203337243 KTLSU10054-7006 ICE1PCS02 DM0365R ICE2BS01 FAN7382
Video Tuner IO Processor Board BN41-00904A BN97-01870D BN41-01545D BN40-0107A MSP4450K WT61P6S Sil9185CTU Sil9125CTU
Panel Interface Board: BN41-00944A BN97-01751D BN94-01442B
Panel Driver: 40/46/52HHC6LV3.3
Panel Samsung LTA460HH-L02
Inverter Transformer: IP-465
A/S 1588-3366
A similar or the same power supply may be in models LN-T4665F LNT4665F LN-T4671F LNT4671F LNT4671 LN-T4681F LE46F86B LNT4669 LN-T4669F LNT4669FX/XAA LN46R81BDX/XAX LNT4671FX/XAA.
Other similar power supply boards with similar problems: BN44-00134A BN44-00167A LN-S4041D
There are different but compatible versions of the BN41-00904A board. Some TVs have HDMI3, USB, and AV2 on a separate board at the edge of the monitor connected by wires. Other TVs do not use a separate board so all of the connectors are soldered directly to BN41-00904A. My TV has the separate board and I bought a BN41-00904A without the riser connectors so I transferred them over. I cut the steel shield.
AVS Forum: Official Samsung LNT-xx71f Owners Thread
Parts List
Tech Report: Samsung LCD TV - LNS4051 power on problem
TV didn't turn on. Two power supply caps popped supplying the 5.4v rail.
CM851, CM852: Samwha 2200uf 10v 105*C XC
Other nearby caps didn't burst:
CM880, CM876: Sam Young 1000uf 25v 105*C NXB
CB850: Samwha 1000uf 10v 105*C XC
With the new caps the TV turns on just fine but there's a picture problem. After an hour or so into a movie the lower 1/5 of the screen goes interlace crazy. The picture spreads out over every other line. The line where the interlacing starts varies so the spread picture bounces up and down. Bad interlacing only shows up when the plastic back is on.
Interlacing is a complex function and should be controlled by the main board BN41-00904A and it looks like it is affected by heat. Heating chips with the SMD heater set to 100*C didn't show anything. I threw a towel over it with the cover off to trap the heat which didn't show anything. I did a heat survey. The hot spots are the chips with heat sinks IC1901, IC1301, IC1001, the regulator IC107, and IC202 that run at 160*F. Other areas run about 120*F. Then I did a cap ESR survey. The caps near the hot spots look pretty good.
Subtract 0.05 from all readings, all readings in circuit
3.3uf (3): 3.0-3.4 ohms
4.7uf near IC302 (2): 4.9-5.2
*22uf 16v (10): 0.11 - 2.1
22uf 35v C156L (1): 0.12
*100uf 16v near IC102 (7): 0.60 - 1.3
100uf 16v near IC202 (2): 0.14 - 0.17
100uf 16v near IC103 (2): 0.11 - 0.13
100uf 16v near IC107 (8): 0.10 - 0.60
100uf 16v near IC1901 (3): 0.06 - 0.23
100uf 16v near IC112 (6): 0.09 - 0.38
100uf 16v near IC110 (3): 0.09 - 0.11
*100uf 16v near TU501 (7): 0.11 - 1.1
(100uf 16v Total 38)
100uf 25v tall (2): 0.19
100uf 25v short (6): 0.10 - 0.18
120uf 6v (1) C168: 0.07
82uf 16v (2): 0.08
82uf 6v (1) C151: 0.07
66 SMD electrolytic capacitors
High ESR caps:
C512 22uf/16v 2.1 ohms
C505 22uf/16v 0.95 ohms
C507 22uf/16v 1.0 ohms
C213 100uf/16v 1.1 ohms
C506 100uf/16v 0.66 ohms
C515 100uf/16v 0.63 ohms
C712 100uf/16v 1.1 ohms
C330 100uf/16v 0.56 ohms
C346 100uf/16v 1.3 ohms
C342 100uf/16v 1.1 ohms
C402 100uf/16v 1.2 ohms
I pulled and measured:
C213: 1.1 ohms
C512, C505, C527: 2.0
These ESR are better than other caps I have so they seem to have not failed. Removing SMD caps is difficult on this board.
Testing just a few of the worst caps doesn't show any clear cap failures. It takes a long time to verify whether a part swap was successful. This wasn't a problem before the power supply caps went out, a problem that is more likely to damage semiconductors than caps. I quit testing for bad caps and ordered the video board.
With the new board in I tested the TV for a few hours with the back on and a towel over the vents. No interlacing. The TV was returned to the owner and no more interlacing.
Pressing the power button over and over to get the TV to turn on can damage boards.
Power Supply IP-321135A BN44-00166C 380203337243 KTLSU10054-7006 ICE1PCS02 DM0365R ICE2BS01 FAN7382
Video Tuner IO Processor Board BN41-00904A BN97-01870D BN41-01545D BN40-0107A MSP4450K WT61P6S Sil9185CTU Sil9125CTU
Panel Interface Board: BN41-00944A BN97-01751D BN94-01442B
Panel Driver: 40/46/52HHC6LV3.3
Panel Samsung LTA460HH-L02
Inverter Transformer: IP-465
A/S 1588-3366
A similar or the same power supply may be in models LN-T4665F LNT4665F LN-T4671F LNT4671F LNT4671 LN-T4681F LE46F86B LNT4669 LN-T4669F LNT4669FX/XAA LN46R81BDX/XAX LNT4671FX/XAA.
Other similar power supply boards with similar problems: BN44-00134A BN44-00167A LN-S4041D
There are different but compatible versions of the BN41-00904A board. Some TVs have HDMI3, USB, and AV2 on a separate board at the edge of the monitor connected by wires. Other TVs do not use a separate board so all of the connectors are soldered directly to BN41-00904A. My TV has the separate board and I bought a BN41-00904A without the riser connectors so I transferred them over. I cut the steel shield.
AVS Forum: Official Samsung LNT-xx71f Owners Thread
Parts List
Tech Report: Samsung LCD TV - LNS4051 power on problem
TV didn't turn on. Two power supply caps popped supplying the 5.4v rail.
CM851, CM852: Samwha 2200uf 10v 105*C XC
Other nearby caps didn't burst:
CM880, CM876: Sam Young 1000uf 25v 105*C NXB
CB850: Samwha 1000uf 10v 105*C XC
With the new caps the TV turns on just fine but there's a picture problem. After an hour or so into a movie the lower 1/5 of the screen goes interlace crazy. The picture spreads out over every other line. The line where the interlacing starts varies so the spread picture bounces up and down. Bad interlacing only shows up when the plastic back is on.
Interlacing is a complex function and should be controlled by the main board BN41-00904A and it looks like it is affected by heat. Heating chips with the SMD heater set to 100*C didn't show anything. I threw a towel over it with the cover off to trap the heat which didn't show anything. I did a heat survey. The hot spots are the chips with heat sinks IC1901, IC1301, IC1001, the regulator IC107, and IC202 that run at 160*F. Other areas run about 120*F. Then I did a cap ESR survey. The caps near the hot spots look pretty good.
Subtract 0.05 from all readings, all readings in circuit
3.3uf (3): 3.0-3.4 ohms
4.7uf near IC302 (2): 4.9-5.2
*22uf 16v (10): 0.11 - 2.1
22uf 35v C156L (1): 0.12
*100uf 16v near IC102 (7): 0.60 - 1.3
100uf 16v near IC202 (2): 0.14 - 0.17
100uf 16v near IC103 (2): 0.11 - 0.13
100uf 16v near IC107 (8): 0.10 - 0.60
100uf 16v near IC1901 (3): 0.06 - 0.23
100uf 16v near IC112 (6): 0.09 - 0.38
100uf 16v near IC110 (3): 0.09 - 0.11
*100uf 16v near TU501 (7): 0.11 - 1.1
(100uf 16v Total 38)
100uf 25v tall (2): 0.19
100uf 25v short (6): 0.10 - 0.18
120uf 6v (1) C168: 0.07
82uf 16v (2): 0.08
82uf 6v (1) C151: 0.07
66 SMD electrolytic capacitors
High ESR caps:
C512 22uf/16v 2.1 ohms
C505 22uf/16v 0.95 ohms
C507 22uf/16v 1.0 ohms
C213 100uf/16v 1.1 ohms
C506 100uf/16v 0.66 ohms
C515 100uf/16v 0.63 ohms
C712 100uf/16v 1.1 ohms
C330 100uf/16v 0.56 ohms
C346 100uf/16v 1.3 ohms
C342 100uf/16v 1.1 ohms
C402 100uf/16v 1.2 ohms
I pulled and measured:
C213: 1.1 ohms
C512, C505, C527: 2.0
These ESR are better than other caps I have so they seem to have not failed. Removing SMD caps is difficult on this board.
Testing just a few of the worst caps doesn't show any clear cap failures. It takes a long time to verify whether a part swap was successful. This wasn't a problem before the power supply caps went out, a problem that is more likely to damage semiconductors than caps. I quit testing for bad caps and ordered the video board.
With the new board in I tested the TV for a few hours with the back on and a towel over the vents. No interlacing. The TV was returned to the owner and no more interlacing.
Pressing the power button over and over to get the TV to turn on can damage boards.
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