Damon, Those resistor values are not correct. R2H02 is 3.9K ohms, and R2H24 is 1.6K. R2H29, and R2H28 measure the same, also, respectfully. Color codes match OK on all 4 of them, with the values I measured. Regards, LLW LeRoy Westlund Westlund TV & Electronics " Walk tall,...Walk straight 93 North Main and look the world Centerfield, UT 84622-0087 right in the eye " Ph./Fax 435-528-3822 mailto:LLW@xxxxxxxxxx -----Original Message----- From: Damon <DAMON101@xxxxxxxxxxxxxx> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx> Cc: LLW@xxxxxxxxxx <LLW@xxxxxxxxxx> Date: Tuesday, January 14, 2003 6:42 AM Subject: [TechAssist] Re: Mitsubishi PTV VS45501A No video to blue CRT > >Pin 2 of IC 204 should have 0.9V on it and that voltage comes from a voltage >divider connected to 12V....R2H02 is 16K ohm connected to 12V and R2H24 is >1.5K ohm connected to ground, I think your R2H24 has changed value. Pin 3 is >a little low, should be 4.2V check R2H03 5.6K ohm and R2H25 3.3K ohm. >Pin 6 is too high, should be 0.9V too. Check R2H29 16K ohm, and R2H28 1.5 >Kohm. > > >----- Original Message ----- >From: "LeRoy Westlund" <llw@xxxxxxxxxx> >To: <techassist@xxxxxxxxxxxxx> >Sent: Monday, January 13, 2003 1:15 PM >Subject: [TechAssist] Re: Mitsubishi PTV VS45501A No video to blue CRT > > >> >> Damon, >> Thanks, we are making progress ! >> Please bare with me, just a little longer. >> I replaced the Zener D227 with another 5.1 volt zener. >> The bias on Q2H12 changed to 3.60- base, 4.08-emmiter, and .02-Collector. >> The video is now coming through, but, the blue CRT is now too bright. >> I can't turn the blue screen control down very far, or I lose video. I >have >> to leave it in about the center range. (I already have replaced the >> Focus/Screen block on this set).I am thinking that I still need to get the >> voltage lower on Q2H12- base. Maybe my zener is still not a good enough >> substitute. I will try a lower value. >> The voltages on IC204 are: >> 1- 4.92 >> 2- 3.31 >> 3- 3.72 >> 4- 5.05 >> 5- 11.32 >> 6- 3.31 >> 7- 3.71 >> 8- 7.62 >> 9- 4.97 >> 10- 3.61 >> 11- 6.32 >> 12- 6.69 >> 13- 6.64 >> 14- .35 >> 15- 5.64 >> 16- .02 >> 17- 2.29 >> 18- 3.92 >> 19- 4.41 >> 20- 3.61 >> >> Regards, >> LLW >> >> LeRoy Westlund >> Westlund TV & Electronics " Walk tall,...Walk straight >> 93 North Main and look the world >> Centerfield, UT 84622-0087 right in the eye " >> Ph./Fax 435-528-3822 >> mailto:LLW@xxxxxxxxxx >> >> -----Original Message----- >> From: Damon <DAMON101@xxxxxxxxxxxxxx> >> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx> >> Date: Monday, January 13, 2003 6:17 AM >> Subject: [TechAssist] Re: Mitsubishi PTV VS45501A No video to blue CRT >> >> >> > >> >Q2H12 emitter is B+ supply side of PNP...and also signal out. 5.3 Volts >on >> >base is too Hi, should be 2.7V from Pin 20 thru r2h47 100 ohm to base, >> r2h46 >> >on emitter is 1800 ohm and connects to 12V supply. >> > >> >Also look at IC204, Pin 8, known as B-gain, should be 7.8V (resistors >R2h04 >> >8200 ohm and R2h06 20kohm divide the 12V down to this). >> > Pin 11 Blue input should have 6V (signal is cap coupled into this) , >> >Pin 14 Clamp should have 0 V, Pin 17 DC adj should have 2.3V, Pin 5 is >12V >> >B+ and Pin 16 is Gnd. >> > >> >Pins 1-4 and 6/7 look like they're set to specific voltages: Pin 1 - >4.8v, >> >2- 0.9v, 3- 4.2V, 4 - 4.9V, 6 - 0.9V and 7 is 3.8V. Labeled A1 A2 A3, >B1 >> >B2 B3 from 1 to 7 (address 101 and 101??). This is gamma correction IC, >> sure >> >can't remember what gamma correction is tho' >> > >> >I think I saw this problem before, and you may be inclined to replace IC >> >204, but check the voltages before replacing it. >> >Damon Brunger >> >damon101@xxxxxxxxxxxxxx >> >----- Original Message ----- >> >From: "LeRoy Westlund" <llw@xxxxxxxxxx> >> >To: <techassist@xxxxxxxxxxxxx> >> >Sent: Sunday, January 12, 2003 9:40 PM >> >Subject: [TechAssist] Re: Mitsubishi PTV VS45501A No video to blue CRT >> > >> > >> >> >> >> Damon, >> >> You got me in the right area. >> >> I have video out of IC204-20, to base of Q2H12. That's where I lose it. >> >> Nothing on emitter of Q2H12. Q2H12 is good, but seems to be biased >wrong. >> >> It has 5.3 volts on the Base, 4.7 volts on the emitter, and .02 volts >on >> >the >> >> collector. >> >> >> >> Is D227 a 5.0, or a 5.1 volt zener ? ( I tried a 5.1, but not sure it >was >> >a >> >> good replacement ). No help. >> >> Also,....what is the value of R2C3, and R2A5 ? ( I measure 330 ohms for >> >> R2C3, and 182 ohms for R2A5 ). >> >> >> >> Thanks, >> >> LLW >> >> >> >> LeRoy Westlund >> >> Westlund TV & Electronics " Walk tall,...Walk straight >> >> 93 North Main and look the world >> >> Centerfield, UT 84622-0087 right in the eye " >> >> Ph./Fax 435-528-3822 >> >> mailto:LLW@xxxxxxxxxx >> >> >> >> -----Original Message----- >> >> From: Damon <DAMON101@xxxxxxxxxxxxxx> >> >> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx> >> >> Date: Sunday, January 12, 2003 5:45 AM >> >> Subject: [TechAssist] Re: Mitsubishi PTV VS45501A No video to blue CRT >> >> >> >> >> >> > >> >> >That's a 1997 VZ4 chassis, you'll find any manual sporting the 97 VZ4 >to >> >be >> >> >of help to you. >> >> >TS50611, VS50502, vs55601, Vs60621.......OH LOOK! I have that manual. >> (Ah >> >> >yes carry one manual, work on 7 different units). Let's see..... >> >> > >> >> >Q222 is biassed by a 2.76V zener/resistor combo r2c4 is 390 ohm ,zener >> is >> >> >d226 (hz-3bll) (sorry about bad grammer, lotsa info...). you need 3.1v >> on >> >> >base to drive it. Blue actually has a D227/R2c4 combo on it >> >> >HZ-5cll/F-200....must be a 200 ohm 1/4w. >> >> > >> >> >The base is driven by Q2H12 emitter, PNP 2sa1115, 3V on emitter, 2.4V >on >> >> >bbase. >> >> >IC204 Pin 20 drives Q2H12. Blue input is Pin 11 of IC204 ----The >above >> >> >circuits are Driven by 12V from RS pin 9. >> >> > >> >> >The next section is....well....weird. 2 transistors, emitters tied >> >> together, >> >> >one transistor is coupled to a bias arrangement that connects RGB's >2nd >> >> >transistor all at the same point.(Must be a current amp/current >mirror) >> >> .The >> >> >other transistor is for the signal, and that signal ORIGINATES FROM >> IC200 >> >> >PIN 24>>NOTICE I USE BIG LETTERS TO ACCENTUATE YOUR 1ST TEST POINT<< >> >Ok, >> >> >lets list the test points from IC200 pin24 to RM 3.... >> >> > >> >> >Pin24 to Q2H04 base-emitter to IC204 pin 11. IC204 Pin 20 to Q2H12 >> >> >base-emitter to Q222 base-emitter. >> >> > >> >> >Also, IK input on IC 200 is pin 25, cap coupled (ac sig in only) and >> >signal >> >> >comes from RM pin 4. Also check IC203 for 9V as that drives Pin 6 >Ic200 >> >and >> >> >that Q2H04/Q2H05 >>weird 2 transistor<< combo. >> >> > >> >> >Looking at the Block Diagram shows that IC200 video jungle is buffered >> by >> >> >Q2h04 and IC204 is Gamma Correction IC, buffered by Q222. >> >> > >> >> >HTH, if not ask and I'll get more info to you, can't copy schem, too >> big. >> >> > >> >> >Damon Brunger >> >> >damon101@xxxxxxxxxxxxxx >> >> >Telrad Electronic Services >> >> >Ft Wayne, IN 46815 >> >> > >> >> >----- Original Message ----- >> >> >From: "LeRoy Westlund" <llw@xxxxxxxxxx> >> >> >To: <techassist@xxxxxxxxxxxxx> >> >> >Sent: Sunday, January 12, 2003 4:32 AM >> >> >Subject: [TechAssist] Re: Mitsubishi PTV VS45501A No video to blue CRT >> >> > >> >> > >> >> >> >> >> >> Yes, Yvon. I tried that, and the blue CRT is OK. >> >> >> I think the jungle IC is bad,...but, just like to scope the RGB >> >outputs, >> >> >> before ordering a new one. >> >> >> >> >> >> Thanks, >> >> >> LLW >> >> >> >> >> >> LeRoy Westlund >> >> >> Westlund TV & Electronics " Walk tall,...Walk straight >> >> >> 93 North Main and look the world >> >> >> Centerfield, UT 84622-0087 right in the eye " >> >> >> Ph./Fax 435-528-3822 >> >> >> mailto:LLW@xxxxxxxxxx >> >> >> >> >> >> -----Original Message----- >> >> >> From: Yvon Roy <atlantek@xxxxxxxxxxx> >> >> >> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx> >> >> >> Date: Saturday, January 11, 2003 1:20 PM >> >> >> Subject: [TechAssist] Re: Mitsubishi PTV VS45501A No video to blue >CRT >> >> >> >> >> >> >> >> >> > >> >> >> >Not familiar with this model but just a tought for checking if the >> CRT >> >> is >> >> >> >good, try to connect the video of the green or red to the blue to >see >> >it >> >> >> the >> >> >> >blue will work ok. Or switch the crt board. >> >> >> > >> >> >> >Yvon Roy >> >> >> > >> >> >> >Atlantek TV Service >> >> >> >1295 Miramichi Ave >> >> >> >Bathurst, NB >> >> >> >E2A 1Y1 >> >> >> >Tel: 506-545-7805 >> >> >> >Fax: 506-546-2171 >> >> >> > >> >> >> >----- Original Message ----- >> >> >> >From: "LeRoy Westlund" <llw@xxxxxxxxxx> >> >> >> >To: "TechAssist" <techassist@xxxxxxxxxxxxx> >> >> >> >Sent: Saturday, January 11, 2003 3:37 PM >> >> >> >Subject: [TechAssist] Mitsubishi PTV VS45501A No video to blue CRT >> >> >> > >> >> >> > >> >> >> >> >> >> >> >> Hi Members, >> >> >> >> I am trying to trace the video back from the blue CRT board, to >see >> >> >where >> >> >> >I >> >> >> >> am losing it. I have good video driving the Red, and Green tubes. >> >> >> >> I Have NO video on SG pin 1. >> >> >> >> Also, no video on RM pin 3. >> >> >> >> Also, nothing driving Q222. >> >> >> >> From that point, I am lost with out a schematic. >> >> >> >> I am asumming that the video driver IC is IC200, but, not sure. >> >> >> >> If IC200 is correct, which pins are the RGB outputs, and what is >> the >> >> >part >> >> >> >> number for IC200 ? Also, is there anything in between IC200, and >> >Q222, >> >> >> >that >> >> >> >> could block my video, that I need to check ? >> >> >> >> >> >> >> >> Thanks for any help, >> >> >> >> LLW >> >> >> >> >> >> >> >> LeRoy Westlund >> >> >> >> Westlund TV & Electronics " Walk tall,...Walk straight >> >> >> >> 93 North Main and look the >world >> >> >> >> Centerfield, UT 84622-0087 right in the eye " >> >> >> >> Ph./Fax 435-528-3822 >> >> >> >> mailto:LLW@xxxxxxxxxx >> >> >> >> >> >> >> >> >> >> >> >> ------------------------------------------ >> >> >> >> Submit A Repair Tip For Everyone Here: >> >> >> >> http://www.tech-assist.org/secure/tip/main.html >> >> >> >> ------------------------------------------ >> >> >> >> To REMOVE your email address, click here: >> >> >> >> http://www.tech-assist.org/unsubb.html >> >> >> >> To CHANGE your email address, click here: >> >> >> >> http://www.techassist.net/forms/change.html >> >> >> >> >> >> >> >> >> >> >> > >> >> >> > >> >> >> >------------------------------------------ >> >> >> >Submit A Repair Tip For Everyone Here: >> >> >> >http://www.tech-assist.org/secure/tip/main.html >> >> >> >------------------------------------------ >> >> >> >To REMOVE your email address, click here: >> >> >> > http://www.tech-assist.org/unsubb.html >> >> >> >To CHANGE your email address, click here: >> >> >> > http://www.techassist.net/forms/change.html >> >> >> > >> >> >> > >> >> >> >> >> >> ------------------------------------------ >> >> >> Submit A Repair Tip For Everyone Here: >> >> >> http://www.tech-assist.org/secure/tip/main.html >> >> >> ------------------------------------------ >> >> >> To REMOVE your email address, click here: >> >> >> http://www.tech-assist.org/unsubb.html >> >> >> To CHANGE your email address, click here: >> >> >> http://www.techassist.net/forms/change.html >> >> >> >> >> >> >> >> >> >> >> > >> >> >------------------------------------------ >> >> >Submit A Repair Tip For Everyone Here: >> >> >http://www.tech-assist.org/secure/tip/main.html >> >> >------------------------------------------ >> >> >To REMOVE your email address, click here: >> >> > http://www.tech-assist.org/unsubb.html >> >> >To CHANGE your email address, click here: >> >> > http://www.techassist.net/forms/change.html >> >> > >> >> > >> >> >> >> ------------------------------------------ >> >> Submit A Repair Tip For Everyone Here: >> >> http://www.tech-assist.org/secure/tip/main.html >> >> ------------------------------------------ >> >> To REMOVE your email address, click here: >> >> http://www.tech-assist.org/unsubb.html >> >> To CHANGE your email address, click here: >> >> http://www.techassist.net/forms/change.html >> >> >> >> >> > >> >------------------------------------------ >> >Submit A Repair Tip For Everyone Here: >> >http://www.tech-assist.org/secure/tip/main.html >> >------------------------------------------ >> >To REMOVE your email address, click here: >> > http://www.tech-assist.org/unsubb.html >> >To CHANGE your email address, click here: >> > http://www.techassist.net/forms/change.html >> > >> > >> >> ------------------------------------------ >> Submit A Repair Tip For Everyone Here: >> http://www.tech-assist.org/secure/tip/main.html >> ------------------------------------------ >> To REMOVE your email address, click here: >> http://www.tech-assist.org/unsubb.html >> To CHANGE your email address, click here: >> http://www.techassist.net/forms/change.html >> >> >> > >------------------------------------------ >Submit A Repair Tip For Everyone Here: >http://www.tech-assist.org/secure/tip/main.html >------------------------------------------ >To REMOVE your email address, click here: > http://www.tech-assist.org/unsubb.html >To CHANGE your email address, click here: > http://www.techassist.net/forms/change.html > > ------------------------------------------ Submit A Repair Tip For Everyone Here: http://www.tech-assist.org/secure/tip/main.html ------------------------------------------ To REMOVE your email address, click here: http://www.tech-assist.org/unsubb.html To CHANGE your email address, click here: http://www.techassist.net/forms/change.html