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Problem for Hitachi 53UWX10B 53 in. Rear Projection Television
Hitachi 61UWX10BA RPTV Convergence Repair
By lgchristians on Oct 28, 2009
I have a Hitachi 61UWX10BA RP HDTV built in 02. The convergence is off so suspect the IC's on the convergence board. I've already pulled the board and have located new Sanyo STK392-110 IC's for replacements. I've read here and there about the possibility of bad resisters and want to change them too. This convergence board shows 13 large resisters along the side of the IC heat sink. I'm sure at least some of them are the ones in question. I've read their values with my DMM and tried to compare them with the color codes but my eyes aren't what they used to be so they're hard to see. Anyone know which resisters to change and what their values are supposed to be?
And, where to get good ones at a decent cost?
And, where to get good ones at a decent cost?
Comments:
Oct 28, 2009
- Spoke with a sales person at Union Electronic Distributors who says Hitachi recommends replacing the STK392-110's with STK394-160E's. Not sure if that's good or bad... Ideas?Oct 29, 2009
- Thanks SD Tech, I just wasn't sure of the quality after reading negative posts about knock-offs... I went and ordered from him on eBay. I have some Arctic Silver II thermal compound I use on CPU's when building a PC and planned to use it on the Hitachi. I also planned to install a couple small 110V cooling fans over the heat sink switched by a current sensing relay off the AC line. I figured a little extra precaution can't hurt. Thanks Again for you help. LCBest Solution
posted on Oct 28, 2009
All of the resistors that fail are very low reading ones---like RK54(1.5 OHM-1 WATT) RK50(2.2 OHM 1 WATT) AND RK58(2.7 OHM 1 WATT)
These are not large resistors--all have location numbers on top of the board under them---most of the protection ones will begin with RK----check them like a fuse--they rarely go off value and if no reading across them they are bad---
There will be some higher value resistors like 150 or 220 ohm----never seen one of those bad.
Sometimes you just have to check them all and if they are good replace the chips and see what you have.
Do not forget to apply heat sink compound to the new chips before you install them(remove any old grease first from the heat sink.)
Good soldering is important here.
SD TECH
If you want to upgrade from the STK-392-110 use STK-392-150---direct replacement and is a higher current device----
Look----the reason any of these chips go bad is the heat sink grease dries out and they do not transfer the heat fast enough and BAMB! one of them goes-----either the 110 or the 150 should give you 5 to 8 years of life----
I buy mine on Ebay---- select search, then advanced search, then search by seller
Look for sewsales55 this company is Suburban Electronics and is in Maryland---fast shipper and they give a 6 month warranty on the chips. Jim is the manager and they are a good resource for lots of parts and have a online site with catalog etc-----his Ebay prices are usually just a little less than the catalog price.
The thing to remember about some of these companies is the guy you talk to on the phone is just a parts guy----most likely has never done this repair himself---
SD TECH
These are not large resistors--all have location numbers on top of the board under them---most of the protection ones will begin with RK----check them like a fuse--they rarely go off value and if no reading across them they are bad---
There will be some higher value resistors like 150 or 220 ohm----never seen one of those bad.
Sometimes you just have to check them all and if they are good replace the chips and see what you have.
Do not forget to apply heat sink compound to the new chips before you install them(remove any old grease first from the heat sink.)
Good soldering is important here.
SD TECH
Comments:
Oct 29, 2009
- You may run into problems if you use the 160 chips-----Hitachi on their site shows that sometimes you have to change the values of resistors..If you want to upgrade from the STK-392-110 use STK-392-150---direct replacement and is a higher current device----
Look----the reason any of these chips go bad is the heat sink grease dries out and they do not transfer the heat fast enough and BAMB! one of them goes-----either the 110 or the 150 should give you 5 to 8 years of life----
I buy mine on Ebay---- select search, then advanced search, then search by seller
Look for sewsales55 this company is Suburban Electronics and is in Maryland---fast shipper and they give a 6 month warranty on the chips. Jim is the manager and they are a good resource for lots of parts and have a online site with catalog etc-----his Ebay prices are usually just a little less than the catalog price.
The thing to remember about some of these companies is the guy you talk to on the phone is just a parts guy----most likely has never done this repair himself---
SD TECH
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Asker's Testimonial
"
Thanks for your help, was leaning in that direction after digging out the magnifying glass and bright light. Now to find a deal on the IC chips.
" - lgchristians
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