jason123
Badcaps Legend
Last Activity: Today, 05:00 AM
Joined: 10-25-2015
Location: Reno, Nevada
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To make sure I understand, you want me to connect external 12VDC to the TCON board, disconnect LVDS cable from main board to TCON and run the set? You expect some color pattern on the screen?... -
Same as photos in Post # 1, Diah. Slightly less prominent on the left hand side of the TV (As you're looking at it) when only that half is connected. Right hand (as you're facing the TV) is just as bad as in #1...Leave a comment:
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Each half comes on, but with lines in the picture....Leave a comment:
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Here you go...
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Diah - It doesn't help me to conceal the truth
This set i hung from the ceiling at a high-ceiling garage, 10-12 foot from the ground, and I'm the only one who uses the garage - kids are grown up in their own houses - Hence the "Definitely" - there is definitely a problem with the set, just not feasibly a physical damage ...
Last edited by jason123; 07-24-2025, 03:30 PM.Leave a comment:
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Thank you.. I'm unable to find any tab that makes any change when pushed - seems, maybe, this is something else?...Leave a comment:
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Thank you.. this TV has the electronics on the bottom. No side tabs. It has connecting ribbon tabs (u shape tabs) - removed, cleaned and attached - no change. Maybe I'm misunderstanding - do you mean how the electronics board attach to the panel?...Leave a comment:
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everyone Any comment on this please? I'm hesitant to buy and try and would like to leverage your experience if possible? Thank youLeave a comment:
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Hisense 65R6E3 double-image / horizontal strips - TCON?
Hello all. 3 years back, with your help, I replaced the LEDs on this TV. It's been working great. Yesterday, I turned it on (garage TV), and it has blurred horiz / vert lines as you see in photos. Definitely no physical hit or damage. Top 1/6th of the screen is perfect. Could it be main / TCON board? No tabs to cut on this model. Thank you...
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interesting - Lesson learned! Thank you...Leave a comment:
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Not too late, I can still do that.. Thank you all for the help...Leave a comment:
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Well, this is a bit anti climactic / bitter sweet - so I had taken the transformer off the board to replace it - a replacement is not available, this is custom transformer specifically made for Agilent. In order to get the plots R_J asked for, I soldered it back on, and miraculously the audible noise seems to have disappeared! I still got the scope captures at the output pins of the transformer, reference to pin 8 of the transformer "ACOM"
Seems to have been solder joint issue? Does anyone have other suggestions? Thank you for the help folks - great team as always. hover over...Last edited by jason123; 07-07-2025, 08:48 PM.Leave a comment:
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looks like most ICs have some marker / dots on them. I took some photos below. I wish I were 20 years old.. no, this 50 plus can hear it. Seems to change with frequency output - I hear it most prominent at 650 Hz and up.. as you change the output frequency, it's like you're playing a musical instrument....
Last edited by jason123; 07-07-2025, 09:20 AM.Leave a comment:
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Yes, the initial suggestion was that the noise maybe coming from the main supply (AC to +12 Vdc)... i swapped that with my friends main supply and the audible noise was still present on my unit (noise followed the main board - not the AC/DC supply.) Seems noise is from / near the transformer on the main board. Trying to determine the "noisy" component...Leave a comment:
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I guess many people were reporting charred tantalums on the main board...Leave a comment:
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Fairly elaborate function, many rails are created from this transformer - Page 177 of manual attached...
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Will share shortly - I had already taken the transformer off the board, in hopes of finding a replacement, but that's dead-ended -It's a specially made transformer for Agilent, and manufacturer only sells it to them....Leave a comment:
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Hi R_J, the mic picked up the noise from that area - so I don't know if it's the transformer or regulator or FETs, ... I took T1301 off the board, and I was hoping to see a crack or something physically bad with it, but I don't - C1324 (560u) is one of the electrolytics and I just replaced with a brand new capacitor. there is a 10u in parallel, but I've never heard of 10u Ceramic with audible noise?? I see some posts online about people complaining about a noisy "Linear Regulator" but referring to +/-15 V circuits - not sue if it's audible noise or noisy signal. That's for designs with...Leave a comment:
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Any specific varnish type? I took it out of circuit - seems fairly rigid. Maybe the audible noise was coming from somewhere near it also, so I'm not really sure...Leave a comment:
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Going Hi-Tech here, I got a microphone and started sniffing around the board - seems to be coming from the Big transformer in the middle of the board
T1301, Agilent PN: 9100-6089, Description: XFMR-PWR 11.88-12.12V/18V, Manuf Code: 53471, Manuf. PN: 31482R
Can't seem to find it anywhere. Any help? Could it be the transformer, or something else near it? mic can't be more precise I'm afraid.
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