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Pupsin
Joined: 08 Jun 2011
Posts: 5
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 Posted: Wed Jun 08, 2011 8:08 pm Post subject: Hitachi 53uwx10ba has power, but no picture |
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Hello!! I am having a problem with our Hitachi 53uwx10ba rear projection tv. Until yesterday, the tv was working fine. About a year ago, we had a convergence problem, and I was able to fix that, so I've been in the tv before 
When you turn the tv on, you hear it turn on, the red light on front lights up and stays on solid, no blinking. When you power down, you hear it turning off. I have my 4 green LED's on the board lighting up, and the one red LED. I had heard that the DP23 (I believe is what it was) can be out, however mine is lit up. I don't know though if it can be green and still be bad. Before we lost the picture completely, the pic pulled into the middle, in an oval shape, then it went out about a minute later...then nothing. Before the pic went out completely you could hear a slight crackling type sound that was very brief. It did sit overnight, and today I did get the oval again, then crackling and now back to no picture or sound.
Until we tried to use it yesterday, there had been no problems. I would appreciate any and all help, this tv while being older, was providing such a beautiful quality picture, I hate to think it's totally dead. I'm sure it's something "easy" to fix, but don't know where to start. Thank you again! |
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Justmanuals
Joined: 21 Aug 2004
Posts: 1948
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jts1957
Joined: 24 Nov 2008
Posts: 2476
Location: Far, Far Away
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Pupsin
Joined: 08 Jun 2011
Posts: 5
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| Posted: Thu Jun 09, 2011 3:13 am Post subject: |
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Thanks I have the service manual and am going through it now  Sure hope it is fixable and cheap....lol |
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slinteriors
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| Posted: Thu Jun 09, 2011 3:24 pm Post subject: |
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| I would check the deflection board and yokes first as thats a DP14G I have seen issues with the deflection board causing an egg shape pic before replaceing the board solved the issue, But we never determined what the cause was except the board. |
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Pupsin
Joined: 08 Jun 2011
Posts: 5
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| Posted: Thu Jun 09, 2011 7:23 pm Post subject: |
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Thanks slinteriors..I think the problem is on the deflection board, it appears on the bottom of the board I see some solder that looks brown, but I need to completely pull the board I think. I did check the FP01 fuse, and it looks mint, was hoping that would be it..lol I have noticed that DP23 LED is weaker than the other lights, but is lit up. I am going to check the yokes as you suggested right now  |
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Pupsin
Joined: 08 Jun 2011
Posts: 5
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| Posted: Sat Jun 11, 2011 4:26 am Post subject: |
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OK..if I post this twice, I am sorry, I hit submit and don't see my reply..
Today I put the tv back together, backboard and all, because I don't think I'll have time to work on it til Sun. afternoon. Hubby came in and turned it on, still no pic or sound...and he hit the side of the set and now it works. Not sure if it will again tom. or not, but for now it's fine. So I'm wondering if there is just something loose that needs re-soldering? I am hoping so, because my theory is if it is bad, it won't work at all...but I guess it could be ready to go out..hmmmm I need to remove the delfection board from the set completely to really get a good look, and see all my options...again thanks for any info |
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minnie
Joined: 18 Aug 2005
Posts: 2880
Location: Hell
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| Posted: Sun Jun 19, 2011 9:38 pm Post subject: |
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| Check the pico fuses that feed the convergence IC's. |
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SOPHM
Joined: 10 Nov 2009
Posts: 29
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| Posted: Tue Jun 21, 2011 5:48 pm Post subject: |
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Check the I601 VERT OUPUT on the DEFLECTION PWB. I have one that the solder joints cracked and Also had a Philips 55PP9401 that had the same board with same cracked joints on the VERT OUTPUT.
Depending on the temperature it would contact sometime and work and go off, picture would mess all up when it contacted and uncontacted. I used a hair dyer and heated up the heat sink for about 10-15 seconds and picture kicked on and put hair dyer on cool and picture would go off. Doing this causes heat sink to expand and contract moving the Vert output chip. |
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Pupsin
Joined: 08 Jun 2011
Posts: 5
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| Posted: Sat Aug 06, 2011 6:48 pm Post subject: |
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| OK..tv is back to not wanting to turn on ...I removed the deflection board and have found that QH01 may be my problem...I used my voltmeter and on the center pin, it goes very high reading...the right pin reads 001 but the left pin which I have been told should read about the same as the right measures anywhere from 800-1300..I have it set to Diode mode for my readings. Q777 reads good, as does FP05. All the solder looks to be in good shape. I just am wondering where the best place to order parts is. Also if anyone reads this thinks I'm wrong..please let me know. I've checked all the pico fuses and they are good. I hope this is the problem |
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