KDL-37XBR6 has no picture but has sound

[adrianluna350]

Re: KDL-37XBR6 has no picture but has sound

I have this same issue. My fuse on the tcon is good but my 12v is down to 2.2v. There doesn't seem to be a dead short on the back side of the tcon fuse so I'm not sure if the Tcon is holding the 12v down or the supply from the main is low.

[adrianluna350]

Re: KDL-37XBR6 has no picture but has sound

Update***** When I unload the LVDS cable to the Tcon, the 12v comes up to 7.7v on the BU board. Still not high enough so I'm assuming there's an issue on the BU with a regulator or something to that effect. Does anybody have a schematic to the BU?

[budm]

Re: KDL-37XBR6 has no picture but has sound

Did you read post 31, 33, and the whole thread?
https://www.badcaps.net/forum/showpo...3&postcount=33

[Lyskar]

Re: Sony KDL-37XBR6 has no picture but has sound

Hello everyone, I'm new to this forum. I have searched and still had questions. Today I turned on my TV and I get no picture. There is sound, and the screen seems to be on. It blinks when I search through the channels....

I have an HDTV with the same issue as c0olasian. Lit, blank screen.
Green LED on the bottom right of the transparent panel. No red solid nor blinking leds(Thank God!).

Screen reacts to the home button, channel change and there is sound, different for each channel and input. I have already memorize the menus and controls and tried the factory resets. No image, color bars or other hope... so I Googled and ended up here.

Reading thru, I noticed c0olasian never responded after going to do the voltage reading on the Tcon. Hopefully he is all right. I think JONESER was as worried on #26 as I was opening my set. I have my Craftsman multimeter and other tools ready.

I have fixed and soldered PC servers, laptops, LCD monitors, other peoples HDTVs and computers down to cell phones with no personal issues but with this HDTV I'm getting sweaty palms.

For now I will try #27 tomorrow. I have a 4 year old son bouncing all over and I'm afraid of him knocking over the HDTV or touching a live circuit. I'm a soldering expert and my soldering iron is fine tipped.

[jts1957]

Re: KDL-37XBR6 has no picture but has sound

I have an HDTV with the same issue as c0olasian. Lit, blank screen.

Same Make?
Same Model?

[Lyskar]

Re: KDL-37XBR6 has no picture but has sound

Same Make?
Same Model?

Sony KDL-37XBR6 Manuf. May 2008

And I just tested the Tcon board and no 12 volts coming in.
EDIT 10 minutes later:
I now have the BU out to test.
EDIT: I'm up to #37 on this thread.

[Lyskar]

Re: KDL-37XBR6 has no picture but has sound


It worked!! I put in a blade car fuse holder and 5 amp fuse, turned it on and the image is back baby!! I've put the back panel back on and it's still running.

[Lyskar]

Re: KDL-37XBR6 has no picture but has sound

It's not fair! It's shut itself off! rapid blinking twice red led labeled "standby".

dag nabbit!!

[Lyskar]

Re: KDL-37XBR6 has no picture but has sound

I unplugged it from the power, then I unplug the Tcon from the BU and plugged the power back in. it's back to no pic(weird fading white from left to right) but has audio or static audio. I removed the power then Isolated the Tcon from J1 and J2, then left J301 inserted. Same twice blinking red standby light. all arrows point to the Tcon. at least I know its under $50 on eBay.

[Lyskar]

Re: KDL-37XBR6 has no picture but has sound

I can't decide on whether to get Seller: masessum to repair it and possibly last for another 5 years, the self repair kit is out of the question since I'm not that micro good or get a "NEW"? from Seller: gromm-hellscream/e-earth and up in the same hole in 5 years....
so many choices.

[Lyskar]

Re: KDL-37XBR6 has no picture but has sound

The Tcon came in. tested it with the "heatsink" jellos still in place and the image came on but solarized. I know I have to factory reset it. Carefully took it apart again. I took off that shitty jello squares on it, cleaned the chips(U602, U601, U801, U21) and the large transistor :U804 with 90 proof rubbing alcohol since the jellos gave off some type of oily residue.

q-tips and cotton balls from my medical-kit HELPED.

Took out my pack of heatsinks, artic-ice CPU thermal paste and superglue. I applied a dab of thermal paste and left enough space for the superglue to lock into the chips. I CAREFULLY placed them on and a micro dab of superglue.
That should fix the t-con problem for the next decade.

The flip down thermal cover wont fit so I just left it as it and screwed the board without it.
after entering service mode on the remote. I reset to factory and I'm good to go. Still enjoying tv with my family without an issue.


I hope it went well for anyone else before me. will keep everyone posted on its progress.
Even on Wikipedia thermal pads are crap vs. thermal paste.

I cant believe the EPA allows companies to continue using thermal pads even after so many Tcon complaints.
If I didn't care about money this HDTV would have ended up in the landfill.

[jimmynas]

Re: KDL-37XBR6 has no picture but has sound

The Tcon came in. tested it with the "heatsink" jellos still in place and the image came on but solarized. I know I have to factory reset it. Carefully took it apart again. I took off that shitty jello squares on it, cleaned the chips(U602, U601, U801, U21) and the large transistor :U804 with 90 proof rubbing alcohol since the jellos gave off some type of oily residue.

q-tips and cotton balls from my medical-kit HELPED.

Took out my pack of heatsinks, artic-ice CPU thermal paste and superglue. I applied a dab of thermal paste and left enough space for the superglue to lock into the chips. I CAREFULLY placed them on and a micro dab of superglue.
That should fix the t-con problem for the next decade.

The flip down thermal cover wont fit so I just left it as it and screwed the board without it.
after entering service mode on the remote. I reset to factory and I'm good to go. Still enjoying tv with my family without an issue.


I hope it went well for anyone else before me. will keep everyone posted on its progress.
Even on Wikipedia thermal pads are crap vs. thermal paste.

I cant believe the EPA allows companies to continue using thermal pads even after so many Tcon complaints.
If I didn't care about money this HDTV would have ended up in the landfill.

Hello, you buy a new t com or repair the old.

[quattr0]

Re: KDL-37XBR6 has no picture but has sound

Back from the dead!!!

Model: KDL-37XBR6

Issue:
Picture is almost normal when the TV is first powered on from being cold.
No picture after ~15 sec then alternation between funky lines and blank
.
Sound works when a valid station is chosen.
No blink code. Solid green power.

Tried throwing money at it as I was short on time
New T-con from shopjimmy.com produced the same issues.

Found this thread and broke out the multi-meter.

I have 12V on the T-con fuse.

I see where some fuses on the main board are listed. All of them check out on continuity and ohm test avg ~0.3

I'm guessing that the voltages printed near the fuses on the main board are what i'm supposed to find there. Most of these are not even close(i.e. calls for 36v has ~12v) ( calls for 24v has ~8v). I'm assuming something in a power circuit is to blame.

Looking for some help on where to look next. I looked at the service manual and my head started spinning.

Pics of the issues are attached.

[dick_barton]

Re: KDL-37XBR6 has no picture but has sound

Post #31 points you to the service manual and the power supply can be found on page 70.
Check the voltages given on CN601 & CN602

[quattr0]

Re: KDL-37XBR6 has no picture but has sound

CN601 - checks out
24.2V on pin 1-4

CN602 - looks like higher voltage than expected on pin 4 and 5. Calls for 13v unreg.
pin value
1
2
3 - 3.3
4 - 16.7
5 - 16.7
6
7
8
9
10 - 12.3
11 - 12.3
12 - 12.3
13

[dick_barton]

Re: KDL-37XBR6 has no picture but has sound

6-7-8-9-10 = GND
10-11-12 = 12.3V

16.3V seems a little high but it is an unregulated voltage so probably OK.
Other than that the power supply voltages all appear to be within limits.

[jts1957]

Re: KDL-37XBR6 has no picture but has sound

6-7-8-9-10 = GND
10-11-12 = 12.3V

16.3V seems a little high but it is an unregulated voltage so probably OK.
Other than that the power supply voltages all appear to be within limits.

Pin 10 cannot be both ground and 12.3V

[dick_barton]

Re: KDL-37XBR6 has no picture but has sound

I missed the very point I was trying to make earlier. ie pin designators mixed up Thanks for pointing out.
2nd attempt
Pins 6,7,8,9,10 = Gnd
Pins 11,12,13 = Reg 12V

[quattr0]

Re: KDL-37XBR6 has no picture but has sound

I missed the very point I was trying to make earlier. ie pin designators mixed up Thanks for pointing out.
2nd attempt
Pins 6,7,8,9,10 = Gnd
Pins 11,12,13 = Reg 12V

You are correct.
I was juggling my 6mo old while typing that reply.

CN602 - corrected findings.
pin value
1
2
3 - 3.3
4 - 16.7
5 - 16.7
6 - ground
7 - ground
8 - ground
9 - ground
10 - ground
11 - 12.3
12 - 12.3
13 - 12.3