I have a Vizio E601i-A3 LCD TV. This morning when I turned it on, I heard sound (coming through the optical audio out port) but could not see video (including the on-screen Vizio logo when first powering up). When shining a flashlight on the screen, I discovered that the video was actually there and seems to be OK. So, I suspect that it is the backlighting that has failed. It is my understanding that this model is edge-lit ("Razor LED"), although I could be wrong.
I have searched this forum, and most of the problems seem to include functional backlighting with no video. However, I found THIS THREAD that describes a problem that sounds exactly like mine (video but no backlighting). I am hoping that the problem is with the Power Supply/LED Board (PN 09-60CAP000-00; 1P-1127800-1010).
I have tested a bunch of things on that board based on the PREVIOUS THREAD, but I am not sure what all of it means, and I am hoping somebody can help me.
CN201 connector from Power Board to Main Board:
Pin__Label_____TV off volts__TV on volts
1____3.3V________3.33__________3.31
2____AC-DET______3.41__________3.39
3____PS-ON_______0.08__________3.28
4____12V-AU______0.60_________12.24
5____GND_________0.00__________0.00
6____GND_________0.00__________0.00
7____GND_________0.00__________0.00
8____12V REG_____0.56_________12.24
9____12V REG_____0.54_________12.24
10___BL-ERR______0.00__________3.26
11___LED-ON______0.00__________3.24
12___LED-BR______0.00__________0.82
13___NC__________0.00__________0.00
14___T2V T CON___0.04_________12.24
15___T CON_ON____0.00__________3.17
Resistance between LED drivers based on letters in photo in old thread:
A/B = 0.6
C/D = 0.6
A/D = 141.3k
B/C = 141.6k
B/E = 1.0
B/F = 141.6k
D/E = 141.3k
D/F = 1.1
Note: E includes capacitor C307 and F includes capacitor C305.
Voltage peaks across capacitors (shown in THIS PHOTO from the previous thread) immediately after power up (all drop back to 0 rapidly):
C308 ~35
C309 ~38
C321 ~33
C332 ~27
---------
C305 0
C307 0
Notes: The spikes are only estimates, because it happened so quickly. I also did capacitors C305 and C307, which never showed any voltage.
CN301 connector from Power Board into panel (LED backlights?):
Pin__Label______Power up voltage peak____TV on volts
1____VLED1-2-__________~+15________________-0.004
2____VLED1-1-_________-0.009_______________-0.009
3____VLED1-2+_________-0.009_______________-0.009
4____VLED1-2-__________~-12________________-0.003
5____VLED2-1+__________~+32________________-0.004
6____VLED2-1-_________-0.009_______________-0.009
7____VLED2-2+_________-0.008_______________-0.008
8____VLED2-2-__________~-17________________-0.004
I saw some CN301 connector voltage readings in ONE OTHER THREAD that make me wonder about my last set of readings. In that thread, pins 1, 4, 5, 8 all show voltages of +83.5 or -83.5. My peak voltages are much lower, and they only briefly spike up upon powering the TV on, and then drop down to very low negative values. It is not clear to me whether these voltages are supposed to stay high, or whether they depend on having a video source hooked up?
If anybody can help me out, I would appreciate it.
I have searched this forum, and most of the problems seem to include functional backlighting with no video. However, I found THIS THREAD that describes a problem that sounds exactly like mine (video but no backlighting). I am hoping that the problem is with the Power Supply/LED Board (PN 09-60CAP000-00; 1P-1127800-1010).
I have tested a bunch of things on that board based on the PREVIOUS THREAD, but I am not sure what all of it means, and I am hoping somebody can help me.
CN201 connector from Power Board to Main Board:
Pin__Label_____TV off volts__TV on volts
1____3.3V________3.33__________3.31
2____AC-DET______3.41__________3.39
3____PS-ON_______0.08__________3.28
4____12V-AU______0.60_________12.24
5____GND_________0.00__________0.00
6____GND_________0.00__________0.00
7____GND_________0.00__________0.00
8____12V REG_____0.56_________12.24
9____12V REG_____0.54_________12.24
10___BL-ERR______0.00__________3.26
11___LED-ON______0.00__________3.24
12___LED-BR______0.00__________0.82
13___NC__________0.00__________0.00
14___T2V T CON___0.04_________12.24
15___T CON_ON____0.00__________3.17
Resistance between LED drivers based on letters in photo in old thread:
A/B = 0.6
C/D = 0.6
A/D = 141.3k
B/C = 141.6k
B/E = 1.0
B/F = 141.6k
D/E = 141.3k
D/F = 1.1
Note: E includes capacitor C307 and F includes capacitor C305.
Voltage peaks across capacitors (shown in THIS PHOTO from the previous thread) immediately after power up (all drop back to 0 rapidly):
C308 ~35
C309 ~38
C321 ~33
C332 ~27
---------
C305 0
C307 0
Notes: The spikes are only estimates, because it happened so quickly. I also did capacitors C305 and C307, which never showed any voltage.
CN301 connector from Power Board into panel (LED backlights?):
Pin__Label______Power up voltage peak____TV on volts
1____VLED1-2-__________~+15________________-0.004
2____VLED1-1-_________-0.009_______________-0.009
3____VLED1-2+_________-0.009_______________-0.009
4____VLED1-2-__________~-12________________-0.003
5____VLED2-1+__________~+32________________-0.004
6____VLED2-1-_________-0.009_______________-0.009
7____VLED2-2+_________-0.008_______________-0.008
8____VLED2-2-__________~-17________________-0.004
I saw some CN301 connector voltage readings in ONE OTHER THREAD that make me wonder about my last set of readings. In that thread, pins 1, 4, 5, 8 all show voltages of +83.5 or -83.5. My peak voltages are much lower, and they only briefly spike up upon powering the TV on, and then drop down to very low negative values. It is not clear to me whether these voltages are supposed to stay high, or whether they depend on having a video source hooked up?
If anybody can help me out, I would appreciate it.
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