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Post by mastertech on Feb 19, 2018 19:48:59 GMT -5
Nice work. Good to see you got it all sorted out and working.  |
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cnt
New Member
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Post by cnt on Feb 9, 2020 12:28:00 GMT -5
Hi barclay66,
Very impressive work. I am trying to fix the same problem for a HW40es, which has the same HDMI input circuit as far as I can tell from the image you posted (I do not have the HW30es service manual. But I suspect they have the same QA board). There was no picture from both ports. HDMI 1 input pins were shorted to the ground inside IC202. I do not understand why HDMI 2 also does not work.
I replaced the IC (TMDS261). Still no picture from both ports. However, I noticed that there were bridges for three pins. Removed the pines. Still no picture. How I wonder whether I have damaged the new IC when I tested with the bridges. Or may be IC205 was already damaged before I even began. I measured the voltages at some of the pins of IC202. The input pins have 1-2 V, but not all the same. The output signal pins (17, 18, 20, and 21, etc) all have 3.6V, which surprised me. Is this normal? If not, what does it point to? What are the voltage on your unit.
Does IC202 need to be programed after replacement?
Thanks.
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Post by barclay66 on Feb 13, 2020 5:14:10 GMT -5
Hi,
If the inputs on HDMI 1 were shorted to ground, You can expect IC202 to be completely dead. Therefore a functioning HDMI 2 input would be a miracle. First of all You should make sure You started at the right end:
Do the internal menus and the analog input work? If not, IC202 won't be the only thing that was fried.
If the answer to the first question is yes, is the power supply at IC202 working (3.3V at pins 6, 12, 19, 25, 40, 46, 55, 61)?
Did You check the resistor packs at the inputs? Mine were blown on at least one of them.
Did You check the additional components around the input circuitry? I found burnt/exploded parts at HDMI 1.
And yes, solder bridges may have damaged IC202. Especially if they connected supply voltages directly to output lines.
I didn't measure any voltages bevor or after replacement of IC202. IC202 doesn't need any programming. Only IC200 and IC201 need to be programmed if replaced as they contain the data needed that source devices connected to the Sony need for identifying its capabilities.
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cnt
New Member
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Post by cnt on Feb 13, 2020 14:22:52 GMT -5
Hi barclay66,
Thanks for the detailed reply. The analog input work fine.
I did check the resister packs and they were fine. I only checked the other components around the IC visually. I did not take the board out of the projector, so I cannot see the back side. Do I need to take it out?
The bridges I noticed were shorting SCL-SINK, SDA-SINK HPD-SINK (on the output side). I am not sure what these pins do and whether this caused any damages to the IC.
I just noticed that I accidentally bridged two input resisters for HDMI 2, and am having a hard time removing the bridge. I may have to remove the resister pack, desolder the bridge, and solder the pack back.
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deep
New Member
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Post by deep on Sept 15, 2021 3:07:12 GMT -5
Hi, I have a similar issue where HDMI Input 1 isn't functioning properly, but the traces and elements look completely fine. How do I go about diagnosing proper function of IC202, does it suffice to only check proper voltage on Vcc pins?  Also, would you be able to share service manual for this model as I cannot find it anywhere? Kind regards, Dan |
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