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Search: Posts Made By: rrflorida
Forum: Troubleshooting Computer Displays 10-08-2018, 09:11 AM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

I ended up using eBay seller dicikey-max. We'll know more in 12-50 days.... Thanks for the suggestions

https://www.ebay.ie/itm/332274532555?ViewItem=&item=332274532555
Forum: Troubleshooting Computer Displays 10-04-2018, 02:25 PM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

fyi - having trouble finding the part - Mouser just cancelled the order and said it is discontinued. More later..
Forum: Troubleshooting Computer Displays 09-14-2018, 08:12 AM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

Ok, I will attempt to replace the chip and report back. Thanks.
Forum: Troubleshooting Computer Displays 09-13-2018, 01:05 PM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

Oh, I messed up pin 1 on U302 (VDD) - it's actually 13.13V, so ok there.

I see what you are saying on INCOM/OUTCOM on U302. I just double checked:
12 INCOM: .64 steady
9 OUTCOM: climbs...
Forum: Troubleshooting Computer Displays 09-12-2018, 02:04 PM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

Below and attached (the formatting is messed up here in the post) are the voltage readings from the BUF07704 chips. The OUT side seems to correlate pretty well with the IN side.



Pin U301 ...
Forum: Troubleshooting Computer Displays 09-11-2018, 04:31 PM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

Data sheet for BUF 07704 attached
Forum: Troubleshooting Computer Displays 09-11-2018, 08:05 AM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

U102 is a 960T45. Left leg is 4.96V, right leg is 3.24V
U300 and U301 are both BUF 07704, which Mouser says is a LCD Gamma Buffer.
Forum: Troubleshooting Computer Displays 09-09-2018, 07:55 PM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

momaka and budm - thanks for the responses, really appreciate the help! I will gather the requested info Monday. Sorry for the delayed reply, was out of town.

randy
Forum: Troubleshooting Computer Displays 09-02-2018, 11:56 AM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

Well, I'm not sure how to test the panel itself - I jiggled all the ribbon cables to the driver boards with no effect. Looks like there is no availability for this tcon board, so I'll need to...
Forum: Troubleshooting Computer Displays 09-01-2018, 10:54 AM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

Oh, that's a nice spreadsheet - thanks for the pointer. It indicates the tcon board is bad, but to check the panel first before replacing the tcon board. I'll search around the forum for how to do...
Forum: Troubleshooting Computer Displays 08-31-2018, 05:17 PM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

Thanks for the response, Budm. The voltages are:

V1: 12.94
V2: 12.43
V3: 10.00
V4: 9.29
V5: 8.89
V6: 8.13
V7: 6.75
V8: 6.55
Forum: Troubleshooting Computer Displays 08-30-2018, 09:54 AM
Replies: 37
Views: 5,990
Posted By rrflorida
Re: HANNS G HZ281 White Screen

Hi - I have the same monitor and problem as the original poster - white screen. I have replaced all the caps except the really large one. And the voltages on the tcon board are:

VCC: 3.23
VDDA:...
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